EP0400872A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A flat-plate antenna for use in mobile communications
Assignee: Harada Industry Co Ltd
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Filing: 1990-05-22
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Granted: —
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Expires: 2010-05-22
Abstract
Abstract A flat-plate antenna for use in mobile communications including a ground plate, a table-shape frame (10) made up with a conductive top plate (10a) and connecting members (11, 12, 13, 14) which electrically connect the top plate to the ground plate (20), a capacitor electrode (41a, 41b) installed between the top plate (10a) and ground plate (20) so as to resonate the table-shape frame (10), and a strip line resonator (30) installed under the table shape frame and is provided with a capacitor electrode (40) for resonating the strip line resonator (30), the capacitor electrode (40) being positioned beneath the central area of the top plate (10a).
Inventors
- 👤 Kazuhiko Nakase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 00:33
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3275; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0414
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
102 words
A flat-plate antenna for use in mobile communications characterized by comprising: a table type antenna (10) comprising a conductive flat-plate (10a) and a plurality of connecting members (11, 12, 13, 14) electrically connecting said flat-plate to a ground plate (20), a capacitor electrode (41a, 41b) installed between one of said connecting members and another connecting member and between said flat-plate and ground plate, a strip line resonator (30) installed under said table type antenna; and a capacitor electrode (40) used for strip line resonance installed on said strip line resonator so as to face a central portion of said table type antenna.
Claim 2
Dependent Claim
102 words
A flat-plate antenna for use in mobile communications characterized by comprising: a table type antenna (10) comprising a conductive flat-plate (10a) and a plurality of connecting members (11, 12, 13, 14) electrically connecting said flat-plate to a ground plate (20), a capacitor electrode (41a, 41b) installed between one of said connecting members and another connecting member and between said flat-plate and ground plate, a strip line resonator (30) installed under said table type antenna; and a capacitor electrode (40) used for strip line resonance installed on said strip line resonator so as to face a central portion of said table type antenna.
Claim 3
Dependent Claim
68 words
A flat-plate antenna according to claim 1, characterized in that both ends of said strip line resonator are grounded, said capacitor electrode is installed at approximately the center of said strip line resonator, said strip line resonator as a whole is positioned in a central area inside said table type antenna, and said strip line resonator is caused to resonate at λ/2 with respect to the frequency used.
Claim 4
Dependent Claim
91 words
A flat-plate antenna according to claim 1, characterized in that one end of said strip line resonator is grounded with the other end left open, said capacitor electrode used for strip line resonance is connected to said open end of said strip line resonator, said strip line resonator as a whole is installed so that said capacitor electrode used for strip line resonance is positioned at a central area inside said table type antenna, and said strip line resonator is caused to resonate at λ/4 with respect to the frequency used.
Claim 5
Dependent Claim
33 words
A flat-plate antenna according to claim 1, characterized in that a feeding point is provided between the grounded end of said strip line resonator and said capacitor electrode used for strip line resonance.
Claim 6
Dependent Claim
55 words
A flat-plate antenna according to claim 1, characterized in that an impedance of said flat-plate antenna for use in mobile communications and an impedance of a feeder line are matched by varying the position of said feeding point between the grounded end of said strip line resonator and capacitor electrode used for strip line resonance.
Claim 7
Dependent Claim
23 words
A flat-plate antenna according to claim 1, characterized in that said flat-plate of said table type antenna is circular or polygon in shape.
Claim 8
Dependent Claim
18 words
A flat-plate antenna according to claim 1, characterized in that said connecting members are rod-form or plate-form conductors.
Claim 9
Dependent Claim
31 words
A flat-plate antenna according to claim 1, characterized in that the resonance frequency of said table type antenna is adjusted by adjusting the length, width or diameter of said connecting members.
Claim 10
Dependent Claim
41 words
A flat-plate antenna according to claim 1, characterized in that the impedance value of said antenna during resonance is set at a value required for broad-band characteristics by adjusting the distance between the edge of said flat-plate and said connecting members.
Claim 11
Dependent Claim
33 words
A flat-plate antenna according to claim 1, characterized in that the resonance frequency of said antenna is adjusted by adjusting the electrostatic capacitance of said capacitor electrodes used for table type antenna resonance.
Claim 12
Dependent Claim
44 words
A flat-plate antenna according to claim 1, characterized in that said capacitor used for strip line resonance is set 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.
Claim 13
Dependent Claim
28 words
A flat-plate antenna, according to claim 1, characterized in that said capacitor electrode installed between one of said connecting members and another connecting member is plural in number.
Claim 14
Dependent Claim
115 words
A flat-plate antenna for use in mobile communications characterized by comprising: a ground plate (20); a table-shape antenna (10) comprising a conductive top plate (10a) and a plurality of connecting members (11, 12, 13, 14) which electrically connect said top plate to said ground plate. a capacitor electrode (41a, 41b) for resonating said table shape, antenna, said electrode being installed between said connecting members and between said top plate and ground plate; a stripe line resonator (30) provided under said table shape antenna; and a capacitor electrode (40) for resonating said strip line resonator, said electrode being provided on said strip line resonator so as to position under a central area of said top plate.
Claim 15
Dependent Claim
115 words
A flat-plate antenna for use in mobile communications characterized by comprising: a ground plate (20); a table-shape antenna (10) comprising a conductive top plate (10a) and a plurality of connecting members (11, 12, 13, 14) which electrically connect said top plate to said ground plate. a capacitor electrode (41a, 41b) for resonating said table shape, antenna, said electrode being installed between said connecting members and between said top plate and ground plate; a stripe line resonator (30) provided under said table shape antenna; and a capacitor electrode (40) for resonating said strip line resonator, said electrode being provided on said strip line resonator so as to position under a central area of said top plate.
Claim 16
Dependent Claim
66 words
A flat-plate antenna according to claim 13, characterized in that both ends of said strip line resonator are connected to said ground plate and said capacitor electrode on said strip line resonator is located beneath the center of said top plate, said strip line resonator positioned in a central area inside said table shape being caused to resonate at λ/2 with respect to a frequency used.
Claim 17
Dependent Claim
83 words
A flat-plate antenna according to claim 13, characterized in that one end of said strip line resonator is connected to said ground with other end unconnected, said capacitor electrode used for strip line resonance is connected to the unconnected end of said strip line resonator which is installed so that said capacitor electrode used for strip line resonance is positioned at the central area under said top plate so that said strip line resonator resonates at λ/4 with respect to a frequency used.
Claim 18
Dependent Claim
44 words
A flat-plate antenna according to claim 13, characterized in that a feeding line is connected to said strip line resonator so that a feeding point is between said grounded end of said strip line resonator and said capacitor electrode used for strip line resonance.
Claim 19
Dependent Claim
35 words
A flat-plate antenna according to claim 13, characterized in that matching of an impedance of said flat-plate antenna and an impedance of said feeder line is obtained by varying the position of said feeding point.
Claim 20
Dependent Claim
29 words
A flat-plate antenna according to claim 1, characterized in that said top plate is provided with cut-outs extending from the outer edge toward the center of said top plate.
References Cited (Backward Citations)
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