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` P1 448517
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`TQMTWMTESL mmmgmew
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`UNITED STATES DEPARTMENT OF COMMERCE
`United States Patent and Trademark Office
`
`
`August 21, 2001
`
`THIS IS TO CERTIFY THAT ANNEXED HERETO IS A TRUE COPY FROM
`THE RECORDS OF THE UNITED STATES PATENT AND TRADEMARK
`OFFICE OF THOSE PAPERS OF THE BELOW IDENTIFIED PATENT
`APPLICATION THAT MET THE REQUIREMENTS TO BE GRANTED A
`FILING DATE UNDER 35 USC 111.,
`
`
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`
` APPLICATION NUMBER: 09/612,034
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`FILING DATE: July 07, 2000
`PCT APPLICATION NUMBER: PCT/US01/41 059
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`7%:flfl/
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`Certifying Officer
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`PRIORITY
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`; DOCUMENT
`SUBMITTED OR TRANSMITTED IN
`COMPLIANCE WITH RULE 17.1(a) OR (b)
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`033 —\0\ OS
`*Output Power Capped When the Device Operates In Very Close Proximity To A Human Body" P
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`(prelerredarrangemenlserrormbelow) - (Ifapplimb/e. all”90855500
`- Descriptive title of the Invention
`a. D Computer Readable Copy
`- Cross References to Related Applications
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`- Statement Regarding Fed sponsored R 8. D
`D ape Copy(
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`c. D Statement verifying identity of above copies
`— Reference to Microfiche Appendix
`ACCOMPANYING APPLICATION PARTS
`- Background of the Invention
`~B‘f mma oftheln ntion
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`1E] Assignment Papers (cover sheet&document(s))
`- Brief Description of the Drawings (iIfi/ed)
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`4, Oath or Declaration
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`a. El Newly executed (original or copy)
`2.. Return Receipt Postcard (”PEP 503)
`(Should be specifically Item/129w
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`i D DELEl'l N OF INVENT
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`Status still proper and desired
`Signed statement attached deleting
`4
`Certified Copy of Priority Document(s)
`'
`inventorls) named in the prior application,
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`(if foreign pn'on'ty is chimew
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`see 37 C.F.R. §§ 1 .63(d)(2) and 1.33m).
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`D Continuation D Divisional E] Continuation-impart (ClP)
`of prior application No: ___/
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`Group /Art Unit:
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`Pnbr ago/ream [Mm-moon: Eamher_________________,
`For CON'I'lmA‘nON or DMStONAL APPS any: The entire disclosure of the prior application, tram which an oath «declaration is applied
`under Box 4b. is massacred a part of the disclosure ot the accompanying communion or divisional application and is hereby ‘neorpormed by
`reference. The imorporaion can my be relied upon when a portion has been inadvertently omitted from the submitted application parts.
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`a Customer Number or Bar Code Label 3
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`or
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`IE Canespondence address below
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`Name
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`Dean A. Monco
`
`Wood, Phillips, VanSanten, Clark & Mortimer
`500 West Madison Street, Suite 3800
`we“—
`Illinois
`ZI‘pCode
`60661-—2511
`Country m—312-876'1800
`312-876‘2020
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`30 091
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`July 7, 2000
`1
`1
`A
`Burden Hour Statemem: Tris form is estimated to take 0.2 hours to complete. Time will vary depending upon the needs at the individual case. Any
`comments on the amount of time you are required to complete this form should be sent to the Chief Information Officer. Patent and Trademark Oflice.
`Washington. DC 20231. Do NOT SEND FEES on COMPLETED FORMS TO THIS ADDRESS. SEND TO: Ass'stant commissioner tor Patents.
`+ Box Patent Appimtion. Wash'ngton. Dc 20231.
`
`2
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`

`

`APPLICATION FOR
`
`UNITED STATES LETTERS PATENT
`
`SPECIFICATION
`
`TO ALL WHOM IT MAY CONCERN:
`
`Be it known that DAVID R. IRVIN, a citizen of the UNITED STATES OF AMERICA,
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`residing at 1546 Iredell Drive, Raleigh, in the State of North Carolina, GERARD J. HAYES, a
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` citizen of the UNITED STATES OF AMERICA, residing at 209 Lilliput Lane, Wake Forest, in the
`
`
`State of North Carolina, and NILS R. RYDBECK, a citizen of SWEDEN, residing at 202
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`Rotherglen, Cary, in the State of North Carolina, have invented a new and useful PORTABLE
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`COMMUNICATION DEVICE WITH RF OUTPUT POWER CAPPED WHEN THE DEVICE OPERATES
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`IN VERY CLOSE PROXIMITY TO A HUMAN BODY of which the following is a specification.
`
`.
`
`CERTIFICATE OFMAILING BY "EXPRESSMAIL"
`
`"Express Mail" Mailing Label Number EM378839008US
`Date ofDeposit: Iuly 7, 2000
`I hereby certify that this paper or fee is being deposited
`with the United States Postal Service ”Express Mail Post
`Office to Addressee" service under 35 CFR 1.10 on the
`date indicated above and is addressed to the Assistant
`Commissioner for Patents, Washington, D.C. 20231 .
`
`egnier
`
`Mg”.—Anne E.
`
`3
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`

`

`.
`
`l
`
`PATENT
`1280.00187
`
`P11715-USl
`
`PORTABLE COMMUNICATION DEVICE WITH RF OUTPUT POWER
`CAPPED WHEN THE DEVICE OPERATES
`IN VERY CLOSE PROXIIVIITY TO A HUMAN BODY
`
`FIELD OF THE INVENTION
`
`5
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`This invention relates to a mobile terminal used in a wireless communication
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`system and, more particularly, to a mobile terminal operable to limit transmitter power if
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`proximate a human body.
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`BACKGROUND OF THE INVENTION
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` the air.
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`A mobile terminal used in wireless communication systems, such as cellular
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`telephone systems, is generally a portable device.
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`In fact, mobile terminals are becoming
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`small enough to fit into a user's pocket, and therefore be very close to the user's body. The
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`mobile tenninal includes a transmitter for transmitting a radio frequency (RF) signal through
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`In a cellular communication system the mobile terminal conducts radio
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`15
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`communications with a base station located proximate the mobile terminal. Cellular
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`communication systems include control systems for limiting power. Typically, the base
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`.
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`station instmcts the mobile terminal to use the least power to avoid interference with other
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`mobile terminals. The base station does so by measuring signal strength and returning
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`instructions to the mobile terminal to modify transmitter power output.
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`4
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`2
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`PATENT
`1280.00187
`
`P11715—USl
`
`While conducting a voice call, the mobile terminal is placed in a "talk"
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`position next to the user's head. Although there is no basis for concerns regarding an antenna
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`being proximate the user, for psychological comfort the user can hold the mobile terminal
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`spaced away or at an angle so that the antenna is farther from the user‘s head. Mobile
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`5
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`terminals are also used to provide wireless connection for personal computers and the like to
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`gain access to the Internet. With smaller mobile terminals the user might slip the mobile
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`terminal into a shirt pocket or the like while the call is being conducted.
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`Again, to provide psychological comfort regarding RF transmitters being very
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`close to a human body, there is a need to control RF power output under such situations.
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`SUMMARY OF THE INVENTION
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`In accordance with the invention, there is provided a mobile terminal that caps
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`or limits RF power output when the mobile terminal is very close to the user, and yet permit
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`the mobile terminal to operate without a power cap otherwise.
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`Broadly, there is disclosed herein a portable communication device operable
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`15
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`to limit transmitter power if proximate a human body. The device includes a housing. A
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`.
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`transmitter in the housing is connected to an antenna. A detector detects if the housing is
`proximate a human body. A control is operatively connected to the transmitter and to the
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`detector. The control controls transmitter power and limits transmitter power ifthe detector
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`5
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`3
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`PATENT
`1280.00187
`
`P11715-USI
`
`detects that the housing is proximate a human body.
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`It is a feature ofthe invention that the transmitter is connected to the antenna
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`through a circulator and the detector senses reflected power from the circulator.
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`It is another feature of the invention that the transmitter is connected to the
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`S
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`antenna through a directional coupler and the detector measures voltage standing wave ratio
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`using the directional coupler.
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`It
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`is a further feature of the invention that the control comprises a
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`programmed processor and the detector is implemented by the programmed processor.
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`It is yet another feature of the invention that the detector comprises a photo
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`detector proximate an opening in the housing. The photo detector is proximate a speaker
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`opening in the housing so that ifthe device is in a "talk" position next to a user's head, then
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`amount of light at the photo detector decreases.
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`It is still another feature ofthe invention that the detector comprises a touch-
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`Lé
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`sensitive detection circuit. The detection circuit comprises a conductive element proximate
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`15
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`speaker openings in the housing so that if a device is in a "talk" position next to a user's head,
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`then the conductive element is in contact with the user's head.
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`.
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`It is still a further feature of the invention that the portable communication
`device comprises an AMPS mobile terminal and the controller resets a mobile attenuation
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`code if the detector detects that the housing is proximate a human body.
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`6
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`4
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`PATENT
`128000187
`
`P11715—USl
`
`It is still an additional feature of the invention that the control integrates
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`transmitter power if the detector detects that the housing is proximate a human body and
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`limits transmitter power after the integrated transmitter power exceeds a select threshold.
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`There is disclosed in accordance with another aspect ofthe invention a mobile
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`5
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`temiinal used in a wireless communication system and operable to limit transmitter power if
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`proximate a human body. The mobile terminal includes a housing. A transmitter in the
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`housing is connected to an antenna. The transmitter has a power control loop controlling
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`transmitter power. A detector detects ifthe housing is proximate a human body. A centrol
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`is operatively connected to the transmitter power control loop and to the detector, the
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`control limiting transmitter power if the detector detects that the housing is proximate a
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`human body.
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`Further features and advantages ofthe invention will be readily apparent from
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`the specification and from the drawings.
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`15
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`Fig.
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`1 is a block diagram of a mobile terminal in accordance with the
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`.
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`invention;
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`Fig. 2 is a general block diagram of the mobile terminal ofFig. I specifically
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`illustrating the power limiting feature of the invention;
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`7
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`5
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`PATENT
`1280.00187
`
`Pll7lS-USl
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`Fig. 3 is a flow diagram illustrating a program implemented in the processor
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`of Fig. 1 for limiting transmitter power output;
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`Fig. 4 is a flow diagram illustrating a program implemented in the processor
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`of Fig. l, in accordance with an alternative embodiment of the invention, for limiting
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`5
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`transmitter power output;
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`Fig. 5 is a block diagram, similar to Fig. 2, illustrating a detector according to
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`a first embodiment of the invention;
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`Fig. 6 is a block diagram, similar to Fig. 2, illustrating a detector according to
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`a second embodiment of the invention;
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`Fig. 7 is a front elevation View of a mobile terminal including a detector
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`according to a third embodiment of the invention;
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`Fig. 8 is a sectional view taken along the line 8-8 ofFig. 7;
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`Fig. 9 is a front elevation View of a mobile terminal including a detector
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`according to a fourth embodiment of the invention; and
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`15
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`Fig. 10 is a sectional view taken along the line 10-10 of Fig. 9.
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`.
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`DETAILED DESCRIPTION OF THE INVENTION
`
`Fig. 1 is a block diagram of a typical mobile terminal shown generally at 10.
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`The mobile terminal includes a housing 11, an antenna 12, a receiver 16, a transmitter 18, a
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`8
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`'
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`6
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`PATENT
`1280.00187
`
`P117lS-USI
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`speaker 20, a processor 22, a memory 24, a user interface 26 and a microphone 32. The
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`antenna 12 is mounted to and can be extended from the housing 11. Alternatively, the
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`antenna 12 could be internal to the housing 11. The antenna 12 is configured to send and
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`receive radio signals between the mobile terminal 10 and a wireless network (not shown),
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`5
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`such as a cellular communications system. The antenna 12 is connected to a duplex filter 14
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`which enables the receiver 16 and the transmitter 18 to receive and broadcast, respectively,
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`.=-._
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`on the same antenna 12. The receiver 16 demodulates, demultiplexes and decodes the radio
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`signals into one or more channels. Such channels includes a control channel and a traffic
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`channel for speech or data. The speech or data are delivered to the speaker 20 (or other
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`output device, such as a modem or fax connector).
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`The receiver 16 delivers messages from the control channel to the processor
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`22. The processor 22 controls and coordinates the functioning of the mobile terminal 10
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`responsive to messages on the control channel using programs and data stored in the memory
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`24, so that the mobile terminal 10 can operate within the wireless network. The processor
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`15
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`22 also controls the operation of the mobile terminal 10 responsive to input from the user
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`interface 26. The user interface 26 includes a keypad 28 as a user-input. device and a display
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`.
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`30 to give the user information. Other devices are frequently included in the user interface
`26, such as lights and special purpose buttons. The processor 22 controls the operations of
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`the transmitter 18 and the receiver 16 over control lines 34 and 36, respectively, responsive
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`9
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`

`

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`7
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`PATENT
`1280.00187
`
`P11715-US1
`
`to control messages and user input.
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`The microphone 32 (or other data input device) receives speech signal input
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`and converts the input into analog electrical signals. The analog electrical signals are
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`delivered to the transmitter 18. The transmitter 18 converts the analog electrical signals into
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`5
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`digital data, encodes the datawith error-detection and correction information and multiplexes
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`this data with control messages from the processor 22. Alternatively, the mobile terminal 10
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`may be connected to a laptop computer or the like which transfers digital signals to the
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`transmitter 18. The transmitter 18 modulates this combined data stream and broadcasts the
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`resultant radio signals to the wireless network through the duplex filter 14 and the antenna
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`12.
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`In accordance with the invention, the mobile terminal 10 includes a proximity
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` detector 38 for detecting ifthe housing 11, and thus antenna 12, is proximate a human body.
`The detector 38 is operatively connected to the processor 22. The processor 22 operates in
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`accordance with a control program, as described more specifically below, to limit or cap
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`ix?
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`15
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`transmitter power output if the antenna 12 is proximate a human body. Particularly, the
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`power is capped, rather than reduced, so that a power control loop operates properly when
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`.
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`the expected transmitter power falls below the cap even though the antenna 12 is proximate
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`the user.
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`Referring to Fig. 2, a block diagram illustrates the power limiting aspect ofthe
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`10
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`10
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`s
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`PATENT
`128000187
`P11715~USl
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`invention. Particularly, the transmitter 18 is expanded to generally illustrate a power control
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`loop 40 for controlling transmitter power output. A baseband block 42 generates an RF
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`signal to be transmitted. The RF signal is provided to an RF driver stage 44. The RF driver
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`stage 44 supplies sufficient signal level to a power amplifier 46. The power amplifier 46
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`amplifies the signal and provides it to the antenna 12.
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`The driver stage 44 and power amplifier 46 are operatively connected to the
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`processor 22. The processor 22 conventionally controls operation of the driver stage 44 and
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`power amplifier 46 to control transmitter power output.
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`In an advanced mobile phone system (AMPS), for example, the base station
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`with which the mobile terminal 10 is communicating transmits a mobile attenuation code
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`(NLAC) identifying one of eight power levels. The processor 22 controls the power control
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`loop 40 so that power output satisfies the MAC.
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`
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`In accordance with the invention, the processor 22 implements a logic
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`function so that ifthe proximity detector 38 senses that the antenna 12 is proximate the user,
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`15
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`then the processor 22 establishes a power level cap that the power amplifier 46 is not
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`permitted to exceed. For example, in an AMPS mobile terminal, mobile attenuation codes
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`000, 001, 010 and 011 could be reset to 100 if the antenna 12 is near the user. This
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`establishes a 100-milliwatt power cap on the power amplifier 46. The other mobile
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`attenuation codes, i. e., 100, 101, 110 and 111, would be processed unaltered, regardless of
`1
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`11
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`11
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`

`

`PATENT
`1280.00187
`P11715-USl
`
`O
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`9
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`proximity to the user, as the power output amounts generated from these codes are less than
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`the cap.
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`As is apparent, the power limiting feature of the invention is not limited to
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`AMPS mobile terminals. This feature can be used with other types of mobile terminals by
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`5
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`limiting transmitter power output using codes or commands particular to the particular type
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`mobile terminal.
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`In a first aspect ofthe invention, the processor 22 intervenes instantaneously
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`in the power control loop 40. Thus, as soon as proximity is detected by the detector 38, then
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`transmit power is capped. This is illustrated in the flow diagram ofFig. 3.
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` control then loops back to the block 50.
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`The flow diagram begins at a block 50 that checks proximity using the
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`proximity detector 38. A decision block 52 determines ifthe antenna 12 is proximate a user.
`If not, then a decision block 54 determines if power was previously capped. If not, then
`control loops back to the block 50. If so, then the power cap is undone at a block 56 and
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`Ifthe antenna 12 is proximate the user, as determined at the decision block
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`.
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`52, then a decision block 58 determines if power is greater than a select threshold. The
`threshold can be a factory-set value or user-set value that defines the power cap.
`In the
`, example discussed above, the threshold is 100 milliwatts, represented by MAC 100. Ifpower
`is not greater than the threshold, then it is not necessary to limit or cap power output and
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`12
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`12
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`

`

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`10
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`PATENT
`1280.00187
`
`Pll715-USl
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`control loops back to the block 50. If power is greater than the threshold, then power is
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`capped at a block 60. The power is capped by reducing the power command signals to the
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`driver stage 44 and/or the power amplifier 46, see Fig. 2. Control then loops back to the
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`block 50.
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`S
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`In accordance with a second aspect of the invention power is integrated as by
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`accumulating sample values over time before the processor 22 intervenes. In this aspect of
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`the invention, energy, represented by power over a specified integration interval, is the
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`driving factor rather than power. This aspect is illustrated by the flow diagram of Fig. 4.
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`The flow diagram begins at a block 70 which awaits transmitter activity along
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` with a decision block 72. If there is no activity, then control continually loops between the
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`
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`tillHillat:121'?riff:liill“‘
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`block 70 and the decision block 72. If there is transmitter activity, then a block 74 starts a
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`clock. The clock is used to set a specified integration interval. A block 76 performs the
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`integration by accumulating the product of power and time. A decision block 78 determines
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`if the accumulated amount is greater than a select threshold. If so, then power is capped at
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`15
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`a block 80 and the routine ends. If the accumulated amount is not greater than the select
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`threshold, then a decision block 82 determines if the transmitter is active. If not, then the
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`.
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`clock and accumulator are reset at a block 84 and control loops back to the block 70. Ifthe
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`transmitter is active, then a decision block 86 determines if the loop has reached the end of
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`a time-based interval. If not, then control loops back to block 76 to continue the integration
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`13
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`11
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`PATENT
`1280.00187
`P11715-US]
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`function. If so, then the accumulator is reset at a block 88 and control loops back to the
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`block 76 to begin another integration interval.
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`The block diagram of Fig. 2 is a functional diagram illustrating power
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`limitation in accordance with the invention. Specific embodiments for detecting proximity
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`5
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`are illustrated below relative to Figs. 5-10. Elements corresponding to those in Fig. 2 are
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`identified with like reference numerals and are not described in detail.
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`Referring initially to Fig. 5, it is known that close proximity to the user's body
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`detunes the mobile terminal's antenna 12. In this embodiment a circulator 90 is connected
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`between the power amplifier 46 and the antenna 12. Reflected power from the circulator 90
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`is measured by the processor 22. The processor 22 compares reflected power with a select
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`threshold. When reflected power exceeds the select threshold, then the processor 22 detects
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`that the antenna 12 is proximate a human body.
`
`Referring to Fig. 6, a fiinctional block diagram illustrates a second
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`
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`embodiment for proximity detection. In the embodiment ofFig. 6, the power amplifier 46 is
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`15
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`connected to the antenna 12 through directional couplers 92. The directional couplers are
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`operatively connected to the processor 22. The processor 22 measures the voltage standing
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`.
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`wave ratio (VSWR) using the directional couplers 92. When the VSWR exceeds a select
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`threshold, then the processor 22 detects that the antenna 12 is proximate a human body. The
`
`VSWR is computed in accordance with the following:
`
`14
`
`14
`
`

`

`.
`
`-
`
`12
`
`V‘l'V 1+ %‘5
`WW p.
`
`PATENT
`1280.00187
`
`P11715-USl
`
`(1)
`
`
`
`where VF is forward voltage, VR is reflected voltage, PF is forward power and PR is reflected
`
`power.
`
`In either embodiment ofFig. 5 or Fig. 6, the processor 22 controls the power
`
`control loop 40 by establishing a power level cap that the power amplifier 46 is not permitted
`
`to exceed, as discussed above relative to Figs. 3 and 4.
`
`Referring to Fig. 7, the mobile terminal housing 11 includes openings 94 for
`
`the speaker 20, see Fig. 1, and an opening 96 for a photodetector 98. As shown in Fig. 8,
`
`the speaker 20 and photo detector 98 are mounted to a printed circuit board 100 in the
`
`housing 11.
`
`The photo detector 98 uses a photo—conductive element, such as cadmium
`
`selanide, whose electrical resistance decreases as incident illumination increases. The change
`
`in resistance can be detected by the processor 22, see Fig. l, to function as a proximity ‘
`
`detector.
`
`15
`
`The photo detector opening 96 allows light to pass through the housing 1 l to
`
`the photo detector 98, as shown generally in Fig. 8. When the mobile terminal 10 is placed
`
`15
`
`15
`
`

`

`.
`
`13
`
`PATENT
`
`1280,00187
`
`P11715-USI
`
`in the "talk" position next to the user's head, then the amount of light to the photo detector
`
`98 decreases. The detection of this decrease in light, representing proximity of the housing
`
`11 to a human body, can be used by the processor 22 to cap or limit output power, as
`
`discussed above. With the exception of total darkness, there is always a decrease in light
`
`5
`
`when the phone is placed next to the user's head. As is apparent, if the housing 11 is
`
`proximate the user’s head, then the antenna 12 is also proximate the user’s head.
`
`Alternatively, the embodiment of Fig. 7 may be operable to detect the
`
`presence of a user by incorporating a photo—conductive element that is sensitive to infrared,
`
`i. e., the thermal output of a user.
`
`Referring to Figs. 9 and 10, the mobile terminal 10 uses proximity detection
`
`.
`
`in accordance with a fourth embodiment of the invention. The housing includes a conductive
`
`element 102 surrounding the speaker openings 94.
`
`In the illustrated embodiment of the
`
`invention, the conductive element 102 is a metallic ring. The ring 102 is connected to a
`
`touch-sensitive detection circuit 104 mounted on the printed circuit board 100. When the
`
`
`
`15
`
`mobile terminal 10 is placed in the "talk" position next to the user's head, then the metallic
`
`ring 102 comes in contact with the user‘s ear. The touch-sensitive detection circuit 104
`
`.
`
`senses this change in contact and sends a signal to the processor 22 for capping or limiting
`
`power output, as discussed above.
`
`Thus,
`
`in accordance with the invention a proximity detector and logic
`
`16
`
`16
`
`

`

`,
`
`14
`
`PATENT
`1280.00187
`
`P11715-USI
`
`functions are used for capping or limiting transmitted power output responsive to an
`
`indication of close proximity to a human body.
`
`
`
`17
`
`17
`
`

`

`
`
`PATENT
`1 280 .001 87
`P 1 17 15—US 1
`
`15
`
`CLAIMS
`
`WE CLAIM:
`
`1.
`
`A portable communication device operable to limit transmitter power
`
`2
`
`if proximate a human body, comprising:
`
`an antenna
`
`4
`
`a transmitter connected to the antenna;
`
`a detector for detecting if the antenna is proximate a human body; and
`
`a control operatively connected to the transmitter and to the detector, the
`
`control controlling transmitter power and limiting transmitter power ifthe detector detects
`
`that the antenna is proximate a human body.
`
`2.
`
`Theportable communication device ofclaim 1 wherein the transmitter
`
`is connected to the antenna through a circulator and the detector senses reflected power from
`
`the circulator.
`
`
`
`
`L;
`
`3 .
`
`The portable communication device ofclaim l wherein the transmitter
`
`. 2
`
`is connected to the antenna through a directional coupler and the detector measures voltage
`
`standing wave ratio using the directional coupler.
`
`18
`
`18
`
`

`

`/
`
`I
`
`16
`
`PATENT
`1280.00187
`P11715—USI
`
`4.
`
`The portable communication device of claim 1 wherein the control
`
`2
`
`comprises a programmed processor and the detector is implemented by the programmed
`
`processor.
`
`5.
`
`The portable communication device of claim 1 further comprising a
`
`2
`
`housing and wherein the detector comprises a photo detector proximate an opening in the
`
`housing.
`
`6.
`
`The portable communication device of claim 5 wherein the photo
`
`"ll-2':
`"1
`
`position next to a users head, then amount of light at the photo detector decreases.
`
` detector is proximate a speaker opening in the housing so that if the device is in a talk
`
`
`7.
`
`The portable communication device of claim 1 fiirther comprising a
`
`housing and wherein the detector comprises a touch-sensitive detection circuit.
`
`8.
`
`The portable communication device of claim 7 wherein the detection
`
`. 2
`
`circuit comprises a conductive element proximate speaker openings so that ifthe device is in
`
`a talk position next to a users head, then the conductive element is in contact with the users
`
`4
`
`head.
`
`19
`
`19
`
`

`

`PATENT
`1280.00187
`P11715-USI
`
`17
`
`9.
`
`The portable communication device of claim 1 wherein the portable
`
`2
`
`communication device comprises a cellular mobile terminal and the control resets a mobile
`
`attenuation code if the detector detects that the antenna is proximate a human body.
`
`10.
`
`The portable communication device of claim 1 wherein the control
`
`integrates transmitter power if the detector detects that the antenna is proximate a human
`
`body and limits transmitter power after the integrated transmitter power exceeds a select
`
`threshold.
`
`20
`
`20
`
`

`

`/
`
`,
`
`18
`
`PATENT
`1280.00187
`P11715-USl
`
`11.
`
`A mobile terminal used in a wireless communication system and
`
`2
`
`operable to limit transmitter power if proximate a human body, comprising:
`
`an antenna;
`
`4
`
`a housing;
`
`a transmitter in the housing connected to the antenna, the transmitter having
`
`6
`
`a power control loop controlling transmitter power;
`
`
`
`
`
`
`"III?!"'“it:
`
`a detector for detecting if the antenna is proximate a human body; and
`
`a control operatively connected to the transmitter power control loop and to
`
`the detector, the control limiting transmitter power if the detector detects that the antenna is
`
`proximate a human body.
`
`12.
`
`The mobile terminal of claim 11 wherein the transmitter is connected
`
`to the antenna through a circulator and the detector senses reflected power from the
`
`circulator.
`
`13.
`
`The mobile temiinal of claim 11 wherein the transmitter is connected
`
`. 2
`
`to the antennathrough a directional coupler and the detectormeasures voltage standing wave
`
`ratio using the directional coupler.
`
`21
`
`21
`
`

`

`/
`
`19
`
`PATENT
`1280.00187
`P11715-USl
`
`14.
`
`The mobile terminal of claim 11 wherein the control comprises a
`
`2
`
`programmed processor and the detector is implemented by the programmed processor.
`
`15.
`
`The mobile terminal of claim 11 wherein the detector comprises a
`
`2
`
`photo detector proximate an opening in the housing.
`
`16.
`
`The mobile terminal of claim 15 wherein the photo detector is
`
`proximate a speaker opening in the housing so that ifthe device is in a talk position next to
`
`a users head, then amount of light at the photo detector decreases.
`
`17.
`
`The mobile terminal of claim 11 wherein the detector comprises a
`
`touch-sensitive detection circuit.
`
`
`
`18.
`
`The mobile terminal of claim 17 wherein the detection circuit
`
`2
`
`comprises a conductive element proximate speaker openings in the housing so that if the
`
`device is in a talk position next to a users head, then the conductive element is in contact with
`
`. 4
`
`the users head.
`
`22
`
`22
`
`

`

`.
`I,
`
`‘
`
`20
`
`PATENT
`128000187
`
`P11715-USl
`
`19.
`
`The mobile terminal of claim ll wherein the mobile terminal
`
`2
`
`comprises a cellular mobile terminal and the control resets a mobile attenuation code if the
`
`detector detects that the antenna is proximate a human body.
`
`20.
`
`The mobile terminal of claim 11 wherein the control integrates
`
`2
`
`transmitter power if the detector detects that the antenna is proximate a human body and
`
`limits transmitter power after the integrated transmitter power exceeds a select threshold.
`
`
`
`23
`
`23
`
`

`

`.1
`
`21
`
`ABSTRACT
`
`PATENT
`1280.00187
`P11715-USI
`
`A mobile terminal used in a wireless communication system is operable to
`
`limit transmitter power if proximate a human body. The mobile terminal includes a housing.
`
`Atransmitter in the housing is connected to an antenna. The transmitter has a power control
`
`loop controlling transmitter power. A detector detects if the housing is proximate a human
`
`body. A control is operatively connected to the transmitter power control loop and to the
`
`detector, the control limiting transmitter power if the detector detects that the housing is
`
`proximate a human body.
`
`
`
`24
`
`24
`
`

`

`RECEIVER
`
`RoaSSECORP
`
`TRANSMITTER
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`mmia2.x.:5:in.
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`._.:5:4...;1.,u3...:5;:2....aman.u.“5...:L...
`
`_....L“
`
`FIG. 1
`
`25
`
`25
`
`

`

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`
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`
`\ BASEBAVN)W
`
`
`
`26
`
`26
`
`

`

`Cwac V—
`
`mom/WI 7‘1”
`
`_ >IHRESH°LD
`
`Fowetz
`
`
`
`533311!32:35
`
`27
`
`27
`
`

`

`
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`Awfi- 1:7
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`Acwai‘)’
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`1'gimll1”"5L“?:Lnl‘
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`
`28
`
`28
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`
`
`29
`
`29
`
`