EP0777295A2
Expired / Lapsed
EP
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Antenna device having two resonance frequencies
Assignee: NTT Docomo Inc
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Filing: 1996-11-20
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Granted: —
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Expires: 2016-11-20
Abstract
Abstract An antenna device having two resonance frequencies wherein two radiating patches are respectively provided on one surface and on the other surface of a dielectric plate which is disposed above a ground plate with a space interposed therebetween. A coupling control capacitor element is connected between these two radiating patches and resonance control capacitor elements are connected between the radiating patches and the ground plate, respectively. Capacitance of the coupling control capacitor element is selected such that a current coupled from one of the two radiating patches to the other and a current supplied from the said one of the radiating patches to the other via the coupling control capacitor element are in opposite phase at the other one of the radiating patches.
Inventors
- 👤 Koichi Tsunekawa
- 👤 Seiji Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 17:41
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/08; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0414; H01Q5/00; H01Q5/10; H01Q5/30; H01Q5/307; H01Q5/314; H01Q5/321; H01Q5/328; H01Q5/342; H01Q5/357; H01Q5/364; H01Q5/371
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
147 words
An antenna device comprising: a ground plate; a dielectric plate disposed in parallel with said ground plate; at least two radiating patches disposed with a space therebetween in parallel with said ground plate on said dielectric plate, one end of each of said radiating patches being electrically grounded to said ground plate; a feeder line having a inner conductor and an outer conductor connected to at least one of said two radiating patches and said ground plate respectively; and a coupling control capacitor element connected between said radiating patches; wherein capacitance of said coupling control capacitor element is selected such that a current coupled from one of said two radiating patches to the other and a current supplied from said one of said two radiating patches via said coupling control capacitor element are in opposite phase to each other at said other one of said radiating patches.
Claim 2
Dependent Claim
53 words
The antenna device according to claim 1, wherein said two radiating patches are disposed on one surface of said dielectric plate and on the other surface of said dielectric plate in opposing relation to each other, and said dielectric plate is disposed in parallel with said ground plate with a space interposed therebetween..
Claim 3
Dependent Claim
33 words
The antenna device according to claim 1, wherein said two radiating patches are disposed with a space interposed therebetween on a common upper surface of said dielectric plate disposed on said ground plate.
Claim 4
Dependent Claim
43 words
The antenna device according to any one of claims 1, 2 and 3 wherein a first resonance control capacitor element is connected between at least one of said two radiating patches and said ground plate for resonance control of said one radiating patch.
Claim 5
Dependent Claim
37 words
The antenna device according to claim 4, wherein a second resonance control capacitor element is connected between the other one of said two radiating patches and said ground plate for resonance control of said other radiating patch.
Claim 6
Dependent Claim
56 words
The antenna device according to any one of claims 1, 2 and 3, wherein conductor leads connected to said two radiating patches, respectively, are extended such that end portions of the conductor leads oppose said ground panel and approach each other, and said coupling capacitor element is connected between the end portions of said conductor leads.
Claim 7
Dependent Claim
66 words
The antenna device according to claim 6, wherein said conductor leads are disposed to extend on an upper surface of an insulating spacer provided on said ground plate such that the end portions of said conductor leads approach each other and a resonance control capacitor element is connected between at least one of said metal lead wires disposed on said insulating spacer and said ground metal.
Claim 8
Dependent Claim
73 words
The antenna device according to any one of claims 1, 2 and 3, wherein each of said two radiating patches is a quadrangle having at least one side which is parallel with one side of the other radiating patch, and metal grounding means for grounding said one side of one radiating patch and said one side of the other radiating patch which are parallel with one another to said ground panel is provided.
Claim 9
Dependent Claim
40 words
The antenna device according to claim 8, wherein said metal grounding means includes at least one grounding metal panel for connecting at least one portion of each of said parallel sides of said two radiating patches to said ground panel.
Claim 10
Dependent Claim
46 words
The antenna device according to claim 8, wherein said metal grounding means includes a short-circuit metal plate for short-circuiting said parallel sides of said two radiating patches throughout the entire length and a grounding metal wire for connecting said short-circuit metal plate to said ground plate.
Claim 11
Dependent Claim
45 words
The antenna device according to claim 8, wherein said metal grounding means includes a short-circuit metal plate for short-circuiting said parallel sides of said two radiating patches throughout the entire length and one side of said short-circuit metal plate is connected to said ground plate.
Claim 12
Dependent Claim
47 words
The antenna device according to claim 2, wherein each of said two radiating patches is a quadrangle having at least one side which is parallel with one side of the other radiating patch, and sides respectively facing to said parallel sides are not parallel with one another.
Claim 13
Dependent Claim
25 words
The antenna device according to claim 12, wherein said non-parallel sides are inclined against said parallel sides in mutually opposite directions and are mutually intersecting.
Claim 14
Dependent Claim
23 words
The antenna device according to claim 10, wherein the inner conductor of said feeder line is electrically connected to said short-circuit metal plate.
Claim 15
Dependent Claim
59 words
The antenna device according to claim 13, wherein a triangular metal plate having one side connected to said short-circuit metal plate and an apex opposite said one side and being disposed in the proximity of said ground plate, is provided and the inner conductor of said feeder line is electrically connected to said apex of said triangular metal plate.
Claim 16
Dependent Claim
31 words
The antenna device according to claim 15, wherein the inner conductor of said feeder line is connected to said apex of said tapered metal plate via an impedance control capacitor element.
Claim 17
Dependent Claim
28 words
The antenna device according to claim 10, wherein said coupling control capacitor element is connected between sides facing respectively to said parallel sides of said two radiating patches.
Claim 18
Dependent Claim
46 words
The antenna device according to any one of claims 1, 2 and 3, wherein said antenna device is used in combination with a whip antenna and is disposed such that its polarization directions of said antenna device and the whip antenna are orthogonal to each other..
References Cited (Backward Citations)
No citation records indexed.
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