Patent EP0376643A2 successfully refreshed from Google Patents.
EP0376643A2
Expired / Lapsed
EP
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Flat-plate antenna for use in mobile communications
Assignee: Harada Industry Co Ltd
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Filing: 1989-12-22
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Granted: —
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Expires: 2009-12-22
Abstract
Abstract A flat-plate antenna for mobile communications used in automobiles, etc. including a table form antenna element (10) made up of a conductive flat-plate section (10A) and a plurality of leg sections which connect to the flat-plate section to a ground plate (20), a strip line resonator (30) provided beneath the table form antenna with a space in between, and a capacitor electrode (40) provided on the strip line resonator directly under the center of the table form antenna element. A feeding line (60, 61) is connected to the strip line resonator.
Inventors
- 👤 Kazuhiko Nakase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:11
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3275; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A flat-plate antenna for use in mobile communications characterized in that said antenna comprises: a table type antenna element (10) which is equipped with a conductive flat-plate part (10A) and a multiple number of connecting parts (11, 12, 13, 14) which electrically connect said flat-plate part to a ground plate (20); a strip line resonator (30) which is installed inside said table type antenna; and a capacitor electrode (40) which is installed on said strip line resonator and directly under the central portion of said table type antenna element.
Claim 2
Dependent Claim
89 words
A flat-plate antenna for use in mobile communications characterized in that said antenna comprises: a table type antenna element (10) which is equipped with a conductive flat-plate part (10A) and a multiple number of connecting parts (11, 12, 13, 14) which electrically connect said flat-plate part to a ground plate (20); a strip line resonator (30) which is installed inside said table type antenna; and a capacitor electrode (40) which is installed on said strip line resonator and directly under the central portion of said table type antenna element.
Claim 3
Dependent Claim
70 words
A flat-plate antenna according to claim 1, characterized in that both ends of said strip line resonator are grounded, and said capacitor electrode is installed substantially at the center of said strip line resonator, said strip line resonator as a whole being installed at substantially the central location inside said table type antenna, and said strip line resonator being caused to resonate at one-half (λ/2) the wavelength of frequency used.
Claim 4
Dependent Claim
88 words
A flat-plate antenna according to claim 1, characterized in that one end of said strip line resonator is grounded while the other end of said strip line resonator is open, said capacitor electrode is connected to said open portion of said strip line resonator, said strip line resonator as a whole is positioned so that said capacitor electrode is located at a substantially central position inside said table type antenna element and said strip line resonator is caused to resonate at one-fourth (λ/4) the wavelength of frequency used.
Claim 5
Dependent Claim
27 words
A flat-plate antenna according to claim 1, characterized in that a feeding point is installed between one grounded end of said strip line resonator and capacitor electrode.
Claim 6
Dependent Claim
52 words
A flat-plate antenna according to claim 1, characterized in that the impedance of said flat-plate antenna element and the impedance of the feeder line of said antenna are matched by varying the position of said feeding point in the area between one grounded end of said strip line resonator and capacitor electrode.
Claim 7
Dependent Claim
26 words
A flat-plate antenna according to claim 1, characterized in that said flat-plate portion of said table type antenna element is circular or regular polygon in shape.
Claim 8
Dependent Claim
18 words
A flat-plate antenna according to claim 1, characterized in that said connecting parts are rod-form or plate-form conductors.
Claim 9
Dependent Claim
33 words
A flat-plate antenna according to claim 1, characterized in that the resonant frequency of said table type antenna element is adjusted by adjusting the size (length, width and/or diameter) of said connecting parts.
Claim 10
Dependent Claim
40 words
A flat-plate antenna according to claim 1, characterized in that said capacitor electrode is installed so that the electrostatic capacitive coupling between said table type antenna and strip line resonator is more or less in a state of critical coupling.
References Cited (Backward Citations)
No citation records indexed.
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