(12) United States Patent
`Chiba et al.
`
`US006195048B1
`US 6,195,048 B1
`Feb. 27, 2001
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`(54) MULTIFREQUENCY INVERTED F-TYPE
`ANTENNA
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`4,700,194 * 10/1987 Ogawa et al. .............. .. 343/700 MS
`
`4,766,440 * 8/1988 Gegan . . . . . . . . .
`. . . . .. 343/700 MS
`5,400,041 * 3/1995 Strickland ............... .. 343/700 MS
`5,986,606 * 11/1999 Kossiavas et al. .......... .. 343/700 MS
`
`FOREIGN PATENT DOCUMENTS
`
`61-171307
`10/1986 (JP).
`64-8823
`1/1989 (JP) .
`10-93332
`4/1998 (JP) .
`* cited by examiner
`Primary Examiner—Tan Ho
`(74) Attorney, Agent, or Firm—Finnegan, Henderson,
`FaraboW, Garrett & Dunner, L.L.P.
`(57)
`ABSTRACT
`
`Amultifrequency inverted F-type antenna Which can receive
`munti?requency band radio Waves Without the enlargement
`of its shape. A cut-out part (12b) is formed in an emission
`conductor (12) one end of Which is connected to a short
`circuit plate (13) planted in a ground conductor (11) and
`Which has a feeding point (12a) to form on the emission
`conductor (12) a ?rst emission conductor (12-1) and a
`second emission conductor (12-2) Which resonate at respec
`tive frequency bands different from each other. By this
`construction the radio Waves of tWo different frequency
`bands, i.e. a ?rst frequency band determined by the shape of
`the ?rst emission conductor (12-1) and a second frequency
`band determined by the shape of the second emission
`conductor (12-2), can be received.
`
`14 Claims, 23 Drawing Sheets
`
`(75) Inventors: Norimichi Chiba, Hino; Takashi
`Amano, Soka; Hisao Iwasaki, Tama,
`all of (JP)
`
`( * ) Notice:
`
`(73) Assignee: Kabushiki Kaisha Toshiba, Kawasaki
`(JP)
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`09/355,525
`Dec. 1, 1998
`
`(21) Appl. No.:
`(22) PCT Filed:
`
`(86) PCT No.:
`PCT/JP98/05400
`§ 371 Date:
`Jul. 29, 1999
`§ 102(e) Date: Jul. 29, 1999
`(87) PCT Pub. No.: WO99/28990
`PCT Pub. Date: Jun. 10, 1999
`Foreign Application Priority Data
`
`(30)
`
`Dec. 1, 1997
`
`(JP) ................................................. .. 9-329824
`
`(51) Int. Cl.7 ..................................................... .. H01Q 1/38
`
`(52) US. Cl. .................................. .. 343/700 MS; 343/767
`
`(58) Field of Search ........................... .. 343/700 MS, 767,
`343/770, 846, 868
`
`12-1
`
`1 2-2
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0001
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 1 0f 23
`
`US 6,195,048 B1
`
`12-1
`
`12-2
`
`FIG.1
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0002
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 2 0f 23
`
`US 6,195,048 B1
`
`REFLEGT l 0N
`COEFF | c | ENT
`(d B)
`A
`
`FREQUENCY (H z )
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0003
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 3 0f 23
`
`US 6,195,048 B1
`
`32-1
`
`60m
`32—2
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0004
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 4 0f 23
`Sheet 4 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`32
`
`PX
`
`FIG.4
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0005
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0005
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 5 0f 23
`
`US 6,195,048 B1
`
`8 PARAMETER (s1 1)
`
`0. c X r
`
`f
`
`—5. 0
`
`—1o, 0
`
`-15. o
`
`;
`0. s1
`
`FREQUENCY (GHZ)
`
`i
`1- 91
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0006
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 6 0f 23
`Sheet 6 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`270°
`- 10. O
`
`225°
`
`o
`180
`
`135
`
`— O. 0
`
`' —10. O
`
`- —20. O
`
`_ —30. O
`
`' —40. O
`/\
`—50. o
`
`
`
`90°
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0007
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0007
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 7 0f 23
`
`US 6,195,048 B1
`
`270°w
`
`FIG.7
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0008
`
`

`

`U.S. Patent
`
`Feb. 27,2001
`
`Sheet 8 0f 23
`
`US 6,195,048 B1
`
`315°
`
`--0.0
`
`-—10.0
`
`I
`
`- -20. O
`
`_ -30. O
`
`450
`
`210"Y
`
`Y
`
`. . ‘ 90°
`
`FIG.8
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0009
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 9 0f 23
`
`US 6,195,048 B1
`
`225°
`
`o
`180
`
`135
`
`270°
`- 10. 0
`
`- 0. 0
`
`' —10. 0
`
`— —20. O
`
`- —30. O
`
`' —40. 0
`/\
`—50. o
`
`90°
`
`FIG.9
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0010
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 10 0f 23
`Sheet 10 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
` -10.0
`
`-20.0
`
`-30.0
`
`270°
`270°’
`
`-40.0
`/\
`-50.0
`
`45°
`
`» 90°
`90°
`
`FIG.1O
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0011
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0011
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 11 0f 23
`Sheet 11 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`
`
`270°
`
`F|G.11
`FIG.11
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0012
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0012
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 12 0f 23
`Sheet 12 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`122-1
`
`122-2
`
`
`
`FIG.12
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0013
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0013
`
`

`

`
`
`{0323
`
`(iv/um
`i
`l
`
`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 13 0f 23
`Sheet 13 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`E9
`
`132-1
`
`132-2
`
`134
`135
`
`FIG.13
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0014
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0014
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 14 0f 23
`Sheet 14 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`142-1
`
`142-2
`
`
`
`142-3
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0015
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0015
`
`

`

`U.S. Patent
`US. Patent
`
`Feb. 27, 2001
`Feb. 27, 2001
`
`Sheet 15 0f 23
`Sheet 15 0f 23
`
`US 6,195,048 B1
`US 6,195,048 B1
`
`152-1
`
`152-2
`
`
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0016
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0016
`
`

`

`U.S. Patent
`
`Feb. 27,2001
`
`Sheet 16 0123
`
`US 6,195,048 B1
`
`1535
`
`\’\|
`
`153
`a
`\q
`
`152-2
`
`f:
`Hb
`V
`
`:Ha
`
`/1\5/2_1
`151
`W
`
`FIG. 16 (a)
`
`152-2
`
`Ta 152-1
`/\/
`151
`
`Hb
`
`FlG.16(b)
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0017
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 17 0f 23
`
`US 6,195,048 B1
`
`1530
`\
`153a
`\4 11?
`
`152-2
`p]
`I
`‘Hb
`
`152-1
`/\/
`151
`/\/
`
`FIG. 17 (a)
`
`152-1
`152-2
`N /\’
`
`at Tr W151
`
`F|G.17(b)
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0018
`
`

`

`US. Patent
`
`Feb. 27, 2001
`
`Sheet 18 0f 23
`
`US 6,195,048 B1
`
`17-1
`
`12-1
`W
`
`12-2
`4;“
`
`12-1
`17—2
`
`f“
`
`17—1
`
`‘2 WWW“
`
`
`
`FlG.18(a)
`
`142—2
`142—3
`142—1
`147—3/V
`147—2/V
`147—1
`21
`
`V\
`
`
`142—2
`
`FIG.18(b)
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0019
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0019
`
`

`

`U.S. Patent
`
`Feb. 27, 2001
`
`Sheet 19 0f 23
`
`US 6,195,048 B1
`
`192-2
`
`192b
`
`‘91
`
`192a
`
`(fv 191a
`:
`193
`
`94
`195
`/'\/
`
`FIG.19
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0020
`
`

`

`US. Patent
`
`Feb. 27, 2001
`
`Sheet 20 0f 23
`
`US 6,195,048 B1
`
`
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0021
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0021
`
`

`

`US. Patent
`
`Feb. 27, 2001
`
`Sheet 21 0f 23
`
`US 6,195,048 B1
`
`
`
`FIG. 21
`
`Prior Art
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0022
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0022
`
`

`

`US. Patent
`
`Feb. 27, 2001
`
`Sheet 22 0f 23
`
`US 6,195,048 B1
`
`202~1
`
`202—2
`
`
`
`FIG.22
`
`Prior Art
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0023
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0023
`
`

`

`US. Patent
`
`Feb. 27, 2001
`
`Sheet 23 0f 23
`
`US 6,195,048 B1
`
`N (A) O
`‘1
`
`
`
`235-1
`
`235—2
`
`FIG. 23
`
`Prior Art
`
`ZTE V. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0024
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0024
`
`

`

`US 6,195,048 B1
`
`1
`MULTIFREQUENCY INVERTED F-TYPE
`ANTENNA
`
`TECHNICAL FIELD
`
`The present invention relates to a multifrequency inverted
`F-type antenna used as an internal antenna of small, thin
`radio communication terminals such as, chiefly, portable
`telephones, and more particularly, it relates to a multifre-
`quency inverted F-type antenna capable of receiving radio
`waves in multiple frequency bands without increasing its
`size.
`
`BACKGROUND ART
`
`In general, inverted F-type antennas have excellent char-
`acteristics as internal antennas of small, thin radio terminals
`typified by portable telephones.
`FIG. 21 is a perspective view showing the typical con-
`struction of a conventional inverted F-type antenna.
`Referring to FIG. 21, in the inverted F-type antenna 210,
`an emission conductor 212 is arranged opposite a ground
`conductor 211, the emission conductor 212 being connected
`to the ground conductor 2112 through a ground conductor
`213.
`
`Also, a feeding point 212a is provided on emission
`conductor 212, and power is supplied to the feeding point
`212a by means of a coaxial feeding line 214 from power
`feeding source 215 through a hole 211 a provided in ground
`conductor 211.
`
`As is known, assuming that the length of emission con-
`ductor 212 is L1 as shown in FIG. 21, the inverted F-type
`antenna 210 resonates with the frequency at which the
`length L1 is about M4 (where )L is the wavelength).
`However, with radio terminals of this type, it is demanded
`that
`the inverted F-type antenna should be capable of
`receiving two or more different frequency bands together in
`order for example to be capable of being employed in two
`or more systems.
`The constructions shown in FIG. 22 or FIG. 23 are known
`
`as conventional constructions whereby it is made possible to
`receive two or more different frequency bands together,
`using an inverted F-type antenna.
`FIG. 22 is a perspective view showing a conventional
`multifrequency inverted F-type antenna that is capable of
`receiving two or more different frequency bands together.
`Referring to FIG. 22,
`in the multifrequency inverted
`F-type antenna 220,
`two emission conductors 222-1 and
`222-2 of different size are arranged in parallel with respect
`to ground conductor 221; these two emission conductors
`222-1 and 222-2 are connected to ground conductor 221
`through respective ground conductors 223-1 and 223-2;
`power is supplied to feeding point 222-1 a on emission
`conductor 222-1 from power feeding source 225-1 by
`coaxial feeding line 224-1 and power is supplied to feeding
`point 222-2a on emission conductor 222-2 from power
`feeding source 225-2 by coaxial feeding line 224-2.
`Specifically,
`in the multifrequency inverted F-type
`antenna 220 shown in FIG. 22, an arrangement is adopted
`whereby two single-frequency inverted F-type antennas that
`resonate in respectively different frequency bands are
`arranged adj acently; as a result, there is the problem that the
`installation area becomes large in order to permit
`the
`arrangement of these two single-frequency inverted F-type
`antennas.
`
`FIG. 23 is a perspective view showing another conven-
`tional multifrequency inverted F-type antenna which is
`capable of receiving two or more different frequency bands
`at once.
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`2
`in the multifrequency inverted
`Referring to FIG. 23,
`F-type antenna 230,
`two emission conductors 232-1 and
`232-2 of different size are arranged in stacked fashion
`relative to ground conductor 231, these two emission con-
`ductors 232-1 and 232-2 being connected to ground con-
`ductor 231 through respective ground conductors 233-1,
`233-2; feeding point 232-1 a on emission conductor 232-1 is
`supplied with power from power feeding source 235-1 by
`coaxial feeding line 234-1, while feeding point 232-2a on
`emission conductor 232-2 is supplied with power from
`power feeding source 235-2 by means of coaxial feeding
`line 234-2.
`
`Specifically, with the construction shown in FIG. 23, two
`single-frequency inverted F-type antennas that resonate in
`respectively different
`frequency bands are arranged in
`stacked fashion; as a result, there is the problem that the
`installation volume becomes large owing to the increased
`height of the installation region in order to provide for the
`stacked arrangement of these two single-frequency inverted
`F-type antennas.
`Thus, there was the problem that, with a conventional
`multifrequency inverted F-type antenna arranged to be
`capable of receiving simultaneously two or more different
`frequency bands, there was the problem that the installation
`area or installation volume became larger than that of a
`conventional single-frequency inverted F-type antenna,
`thereby presenting an obstacle to reducing the size and
`thickness of a radio terminal accommodating such a multi-
`frequency inverted F-type antenna.
`
`DISCLOSURE OF THE INVENTION
`
`invention is to
`Accordingly, an object of the present
`provide a multifrequency inverted F-type antenna whereby
`radio waves of multiple frequency bands can be received
`without increase in size.
`
`In order to achieve this object, the invention according to
`claim 1 is a multifrequency inverted F-type antenna com-
`prising: a ground conductor; a short-circuit plate planted in
`the ground conductor; a first emission conductor arranged
`facing the short-circuit plate, having a cut-out part in its
`interior, and whose one end is connected to the short-circuit
`plate; and a second emission conductor arranged facing the
`short-circuit plate and formed within the cutout part of the
`first emission conductor.
`
`Also, in the invention according to claim 2, in the inven-
`tion of claim 1, the first emission conductor comprises a
`feeding point connection part whereby connection of the
`feeding point is effected, between the cut-out part and the
`short-circuit plate.
`Also, in the invention according to claim 3, in the inven-
`tion of claim 1, the second emission conductor is formed
`integrally with the first emission conductor.
`Also, in the invention according to claim 4, in the inven-
`tion of claim 1, the second emission conductor has a single
`projection and operates in two frequency bands dependent
`on the shape of the first emission conductor and the shape of
`the second emission conductor.
`
`Also, in the invention according to claim 5, in the inven-
`tion of claim 4, the first spacing between the first emission
`conductor and the ground conductor and the second spacing
`between the second emission conductor and the ground
`conductor are set to respectively different distances.
`Also, in the invention according to claim 6, in the inven-
`tion of claim 4, dielectric elements are arranged between at
`least one of either the first emission conductor and the
`
`ZTE v. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0025
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0025
`
`

`

`US 6,195,048 B1
`
`3
`ground conductor or the second emission conductor and the
`ground conductor, the first dielectric constant between the
`first emission conductor and the ground conductor and the
`second dielectric constant between the second emission
`
`conductor and the ground conductor being different.
`Also, in the invention according to claim 7, in the inven-
`tion of claim 1,
`the second emission conductor has a
`plurality of projections and operates in a plurality of fre-
`quency bands dependent on the shape of the first emission
`conductor and the shape of the second emission conductor.
`Also, in the invention according to claim 8, in the inven-
`tion of claim 7, the first spacing between the first emission
`conductor and the ground conductor and a plurality of
`second spacings between the projections of the second
`emission conductor and the ground conductor are set to
`respectively different distances.
`Also, in the invention according to claim 9, in the inven-
`tion of claim 7, a dielectric element is arranged in at least
`one of the spacings between the first emission conductor and
`the ground conductor and between the projections of the
`second emission conductor and the ground conductor, and
`the first dielectric constant between the first emission con-
`
`ductor and the ground conductor and the second dielectric
`constant between the projections of the second emission
`conductor and the ground conductor, respectively, are made
`to be different.
`
`in the
`in the invention according to claim 10,
`Also,
`invention of claim 2, the feeding point is arranged in the
`middle of the feeding point connection part in the width
`direction of the first emission conductor.
`
`in the
`in the invention according to claim 11,
`Also,
`invention of claim 2,
`the feeding point is arranged at a
`position of the feeding point connection part offset by a
`prescribed distance from the middle in the width direction of
`the first emission conductor.
`
`in the
`in the invention according to claim 12,
`Also,
`invention of claim 1, the short-circuit plate is formed of the
`same length as the length in the width direction of the first
`emission conductor.
`
`in the
`in the invention according to claim 13,
`Also,
`invention of claim 1, the short-circuit plate is formed of
`shorter length than the length in the width direction of the
`first emission conductor and with its center offset from the
`center in the width direction of the first emission conductor.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a perspective view showing a first embodiment
`of a multifrequency inverted F-type antenna according to the
`present invention;
`FIG. 2 is a diagram showing the frequency characteristic
`of the multifrequency inverted F-type antenna 10 shown in
`FIG. 1;
`FIG. 3 is a perspective view showing a multifrequency
`inverted F-type antenna 30 constituted by applying specific
`dimensions of the multifrequency inverted F-type antenna
`10 shown in FIG. 1;
`FIG. 4 is a view showing a coordinate system for ana-
`lyZing the radiation pattern of the multifrequency inverted
`F-type antenna 300 shown in FIG. 3;
`FIG. 5 is a diagram showing the reflection characteristic
`at the antenna feeding point when analyzed using electro-
`magnetic field analysis (method of moments) on the char-
`acteristic of the multifrequency inverted F-type antenna 300
`shown in FIG. 3;
`FIG. 6 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (X-Y plane in FIG. 4) in
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`4
`the 800 MHZ band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3;
`FIG. 7 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (X-Z plane of FIG. 4) in
`the 800 MHZ band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3;
`FIG. 8 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (Y-Z plane in FIG. 4) in
`the 800 MHZ band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3;
`FIG. 9 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (X-Y plane in FIG. 4) in
`the 1.9 GHZ band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3;
`FIG. 10 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (X-Z plane in FIG. 4) in
`the 1.9 GHZ band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3;
`FIG. 11 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (Y-Z plane in FIG. 4) in
`the 1.9 GHZ band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3;
`FIG. 12 is a perspective view showing a second embodi-
`ment of the multifrequency inverted F-type antenna accord-
`ing to the present invention;
`FIG. 13 is a perspective view showing a third embodiment
`of a multifrequency inverted F-type antenna according to the
`present invention;
`FIG. 14 is a perspective view showing a fourth embodi-
`ment of a multifrequency inverted F-type antenna according
`to the present invention;
`FIG. 15 is a perspective view showing a fifth embodiment
`of a multifrequency inverted F-type antenna according to the
`present invention;
`FIGS. 16(a) and 16(b) are cross-sectional views along the
`line A—A (FIG. 16(a)) and a perspective view along the line
`B—B (FIG. 16(b)) of the multifrequency inverted F-type
`antenna shown in FIG. 15;
`
`FIGS. 17(a) and 17(b) show cross-sectional views along
`the line A—A (FIG. 17(a)) and a cross-sectional view along
`the line B—B (FIG. 18(b)) corresponding to FIGS. 16(a)
`and 16(b), constituted such as to enable adjustment of the
`distance Hb between the second emission conductor 152-2
`
`and ground conductor 151, by the provision of a down-
`wardly directed part 1536 in place of the upwardly directed
`part 153a of second emission conductor 152-2 in the con-
`struction shown in FIG. 15;
`
`FIGS. 18(a) and 18(b) are cross-sectional views showing
`a sixth embodiment of a multifrequency inverted F-type
`antenna constituted by inserting a dielectric element
`between the ground conductor and first emission conductor
`and second emission conductor;
`FIG. 19 is a perspective view showing a seventh embodi-
`ment of a multifrequency inverted F-type antenna according
`to the present invention;
`FIG. 20 is a perspective view showing an eighth embodi-
`ment of a multifrequency inverted F-type antenna according
`to the present invention;
`FIG. 21 is a perspective view showing the typical con-
`struction of a conventional inverted F-type antenna;
`FIG. 22 is a perspective view showing a conventional
`multifrequency inverted F-type antenna arranged to be
`capable of receiving simultaneously two or more different
`frequency bands; and
`
`ZTE v. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0026
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0026
`
`

`

`US 6,195,048 B1
`
`5
`FIG. 23 is a perspective view showing another conven-
`tional multifrequency F-type antenna constructed so as to be
`capable of receiving simultaneously two or more different
`frequency bands.
`BEST MODE FOR CARRYING OUT THE
`INVENTION
`
`Embodiments of a multifrequency inverted F-type
`antenna according to the present invention are described
`below with reference to the appended drawings.
`FIG. 1 is a perspective view showing a first embodiment
`of a multifrequency inverted F-type antenna according to the
`present invention.
`Referring to FIG. 1, in the multifrequency inverted F-type
`antenna 10, there are formed a first emission conductor 12-1
`and second emission conductor 12-2 that resonate in respec-
`tively different frequency bands on an emission conductor
`12 by forming a cut-out part 12b in the emission conductor
`12, which is provided with a feeding point 12a and whose
`one end is connected to a short-circuit plate 13 planted in
`ground conductor 11. With this construction, it is capable of
`receiving radio waves of two different frequency bands: a
`first frequency band determined by the shape of first emis-
`sion conductor 12-1 and a second frequency band deter-
`mined by the shape of second emission conductor 12-2.
`Specifically, a first emission conductor 12-1 of resonance
`length LA in FIG. 1 and a second emission conductor 12-2
`of resonance length LB in FIG. 1 are formed on emission
`conductor 12. One end of the emission conductor 12 is
`connected to ground conductor 11 through short-circuit plate
`13 and power is supplied to a single feeding point 12a of the
`emission conductor 12 by a coaxial feeding line 14 from
`power feeding source 15 through a hole 11 a provided in
`ground conductor 11.
`the multifrequency inverted
`With this construction,
`F-type antenna 10 resonates in a first frequency band
`wherein length LA is about M4 ()L is the wavelength) by
`means of first emission conductor 12-1, and resonates in a
`second frequency band wherein length LB is about M4 ()L is
`the wavelength) by means of second emission conductor
`12-2. As a result, the multifrequency inverted F-type antenna
`10 becomes capable of receiving radio waves of two fre-
`quency bands, namely, the first frequency band and second
`frequency band, without
`increase of installation area or
`installation volume.
`
`the multifre-
`Specifically, as regards installation area,
`quency inverted F-type antenna 10 shown in FIG. 1 has the
`same installation area as a conventional single-frequency
`inverted F-type antenna that resonates in the first frequency
`band wherein length LA is about M4 (where )L is the
`wavelength). As regards installation height (installation
`volume),
`it has the same installation height (installation
`volume) as a conventional single-frequency inverted F-type
`antenna that resonates in the first frequency band wherein
`length LA is about M4 (where )L is the wavelength). A
`multifrequency inverted F-type antenna which is smaller in
`size and thinner than the conventional multi-frequency
`antennas shown in FIG. 22 and FIG. 23 can thereby be
`realized. That is, the multifrequency inverted F-type antenna
`10 shown in FIG. 2 does not need to have its installation area
`and installation volume increased in order to resonate in the
`
`second frequency band wherein length LB is about M4
`(where )L is the wavelength).
`FIG. 2 is a diagram showing a frequency characteristic of
`the multifrequency inverted antenna 10 shown in FIG. 1.
`In FIG. 2, the vertical axis shows the reflection coefficient
`(dB) at feeding point 12a of the multifrequency inverted
`F-type antenna 10, while the horizontal axis shows fre-
`quency (Hz).
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`6
`the multifrequency inverted
`As is clear from FIG. 2,
`F-type antenna 10 has two sharp resonant points at fre-
`quency A and frequency B; frequency Ais determined by the
`shape of first emission conductor 12-1 of resonance length
`LA, while frequency B is determined by the shape of second
`emission conductor 12-1 of resonance length LB.
`Specifically, the multifrequency inverted F-type antenna
`10 shown in FIG. 1 is capable of receiving radio waves in
`two frequency bands, namely, a first frequency band deter-
`mined by the shape of first emission conductor 12-1 and a
`second frequency band determined by the shape of second
`emission conductor 12-2.
`
`FIG. 3 is a perspective view showing a multifrequency
`inverted F-type antenna 30 constituted by supplying specific
`dimensions of the multifrequency inverted F-type antenna
`10 shown in FIG. 1.
`
`Referring to FIG. 3, in the multifrequency inverted F-type
`antenna 30, emission conductor 32 is constituted of a size:
`80 mm><40 mm and one 40 mm side of the emission
`
`conductor 32 is connected to a ground conductor 31 through
`a short-circuit plate 33 of size 40 mm><4 mm. In emission
`conductor 32, there is formed a practically U-shaped cut-out
`part 32b of external width 25 mm, internal width 20 mm, and
`height 60 mm, leaving a feeding point connection part of
`width 10 mm for forming feeding point 32a.
`In this way, on emission conductor 32, there are formed
`a first emission conductor 32-1 of approximately U-shape of
`external width 40 mm, internal width 25 mm and height 70
`mm connected to a feeding point connection part of width 10
`mm, and a second emission conductor 32-2 having a rect-
`angular shape of 20 mm><30 mm and connected to the
`feeding point connection part of width 10 mm.
`Thus,
`the first emission conductor 32-1 having an
`approximately U shape of external width 40 mm, internal
`width 25 mm and height 70 mm that is connected to the
`feeding point connection part of width 10 mm constitutes a
`first
`inverted F-type antenna that resonates in the first
`frequency band, while the second emission conductor 32-2
`having a rectangular shape of 20 mm><30 mm connected to
`the feeding point connection part of width 10 mm constitutes
`a second inverted F-type antenna that resonates in the
`second frequency band.
`The feeding point connection part of width 10 mm has the
`function of matching the first inverted F-type antenna and
`second inverted F-type antenna.
`Power is supplied to a single feeding point 32a of emis-
`sion conductor 32 by means of coaxial feeding line 34 from
`power feeding source 35, through a hole 31a provided in
`ground conductor 31.
`The multifrequency inverted F-type antenna 30 shown in
`FIG. 3 may be assumed to be the internal antenna of a
`portable telephone constituting a dual-mode terminal
`capable of sending and receiving under the two systems:
`GSM (Global System for Mobile Communication) and PHS
`(Personal Handyphone System); by means of the first
`inverted F-type antenna and second inverted F-type antenna
`described above, a multifrequency inverted F-type antenna
`is realized that is capable of sending and receiving in the
`GSM radio frequency 800 MHz band and PHS radio fre-
`quency 109 GHz band.
`Next, the results of analysis of the radiation pattern of the
`multifrequency inverted F-type antenna 300 illustrated in
`FIG. 3 will be described.
`
`FIG. 4 is a diagram illustrating a coordinate system for the
`purposes of analysis of the radiation pattern of the multi-
`frequency inverted F-type antenna 300 illustrated in FIG. 3.
`
`ZTE v. Fractus
`
`IPR2018-01461
`
`ZTE
`
`Exhibit 1006.0027
`
`ZTE v. Fractus
`IPR2018-01461
`
`ZTE
`Exhibit 1006.0027
`
`

`

`US 6,195,048 B1
`
`7
`Referring to FIG. 4, in the coordinate system for analysis
`of the radiation pattern of the multifrequency inverted
`F-type antenna 300 illustrated in FIG. 3,
`the direction
`orthogonal to the surface of the emission conductor 302 is
`defined as the Z aXis, the longest aXis direction of emission
`conductor 302 is defined as the X aXis, and the shortest aXis
`direction is defined as the Y aXis.
`
`FIG. 5 is a diagram showing the reflection characteristic
`at the antenna feeding point when the characteristic of the
`multifrequency inverted F-type antenna 300 shown in FIG.
`3 is analyzed using electromagnetic field analysis (method
`of moments).
`In FIG. 5, the vertical aXis shows the reflection charac-
`teristic i.e. the S parameter ($11) at the antenna feeding point
`and the horizontal aXis shows the frequency (GHz).
`As is clear from FIG. 5,
`the multifrequency inverted
`F-ype antenna 300 illustrated in FIG. 3 realizes a multifre-
`quency inverted F-type antenna that is capable of receiving
`both the GSM radio frequency 800 MHz band and PHS
`radio frequency 109 GHz band.
`FIG. 6 is a radiation pattern diagram illustrating the
`results of analysis of the radiation pattern (in the X-Y plane
`of FIG. 4) in the 800 MHz band of the multifrequency
`inverted F-type antenna 300 illustrated in FIG. 3.
`FIG. 7 is a radiation pattern diagram illustrating the
`results of analysis of the radiation pattern (X-Z plane in FIG.
`4) in the 800 MHz band of the multifrequency inverted
`F-type antenna 300 illustrated in FIG. 3.
`FIG. 8 is a radiation pattern diagram illustrating the
`results of analysis of the radiation pattern (Y-Z plane in FIG.
`4) in the 800 MHz band of the multifrequency inverted
`F-type antenna 300 illustrated in FIG. 3.
`As is clear from FIG. 6 to FIG. 8, although the multifre-
`quency inverted F-type antenna 300 illustrated in FIG. 3
`shows some deterioration in the 800 MHz band as regards
`the X-Z plane radiation pattern and Y—Z plane radiation
`pattern, it has practically the same directionality as a one-
`sided short-circuit patch and has the same performance as an
`800 MHz band single-frequency inverted F-type antenna.
`FIG. 9 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (X-Y plane of FIG. 4) in
`the 1.9 GHz band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3.
`
`FIG. 10 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (X-Z plane in FIG. 4) in
`the 1.9 GHz band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3.
`
`FIG. 11 is a radiation pattern diagram showing the results
`of analysis of the radiation pattern (Y—Z plane in FIG. 4) in
`the 1.9 GHz band of the multifrequency inverted F-type
`antenna 300 shown in FIG. 3.
`
`As is clear from FIG. 9 and FIG. 11, the multifrequency
`inverted F-type antenna 300 shown in FIG. 3 shows some
`deterioration in the X-Z plane radiation pattern and Y—Z
`plane radiation pattern in the 1.9 GHz band, but it has
`practically the same directionality as a one-sided short-
`circuit patch and has the same performance as a 1.9 GHz
`band single-frequency inverted F-type antenna.
`In this way, with the multifrequency inverted F-type
`antenna 300 shown in FIG. 3, a small and thin multifre-
`quency inverted F-type antenna can be realized, which can
`provide a multifrequency inverted F-type antenna that is
`capable of being adopted as the internal antenna of dual-
`mode terminals of various types.
`FIG. 12 is a perspective view showing a second embodi-
`ment of a multifrequency inverted F-type antenna according
`to the present invention.
`
`8
`in the multifrequency inverted
`Referring to FIG. 12,
`F-type antenna 120, by forming a cut-out part 122b in
`emission conductor 122 provided with a feeding point 122a,
`whose one end is connected to short-circuit plate 123
`planted in ground conductor 121, there are formed a first
`emission conductor 122-1 on the emission conductor 122,
`and an inverted L-shaped second emission conductor 122-2;
`by this means, this antenna is capable of