Small antenna
First Claim
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1. A small antenna comprising:
- a dielectric plate which has parallel upper and lower faces spaced from each other a distance far smaller than a wavelength employed by said small antenna;
an upper conductive plate which is provided on said upper face of said dielectric plate;
a lower conductive plate which is provided on said lower face of said dielectric plate;
a plurality of conductive reactance post members which are, respectively, provided at a plurality of first positions of said dielectric plate so as to extend between said upper and lower conductive plates such that said upper and lower conductive plates are connected, at their positions corresponding to said first positions, to each other by said reactance post members;
said reactance post members dividing said upper and lower conductive plates into a first upper conductive portion and a second upper conductive portion and into a first lower conductive portion and a second lower conductive portion, respectively such that first and second planeparallel plate transmission lines separated from each other by said reactance post members are, respectively, formed by said first upper conductive portion and said first lower conductive portion and by said second upper conductive portion and said second lower conductive portion; and
a feed point which is provided at a second position of said dielectric plate for subjecting said upper and lower conductive plates, at their positions corresponding to said second position, to power feed from said feed point.
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Abstract
A small antenna including a dielectric plate, upper and lower conductive plates provided on upper and lower faces of the dielectric plate, respectively, a plurality of conductive reactance posts for connecting, at first positions of the dielectric plate, the upper and lower conductive plates to each other, and a feed point provided at a second position of the dielectric plate such that first and second plane-parallel plate transmission lines separated from each other by the reactance posts are formed by the upper and lower conductive plates.
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Citations
13 Claims
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1. A small antenna comprising:
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a dielectric plate which has parallel upper and lower faces spaced from each other a distance far smaller than a wavelength employed by said small antenna; an upper conductive plate which is provided on said upper face of said dielectric plate; a lower conductive plate which is provided on said lower face of said dielectric plate; a plurality of conductive reactance post members which are, respectively, provided at a plurality of first positions of said dielectric plate so as to extend between said upper and lower conductive plates such that said upper and lower conductive plates are connected, at their positions corresponding to said first positions, to each other by said reactance post members; said reactance post members dividing said upper and lower conductive plates into a first upper conductive portion and a second upper conductive portion and into a first lower conductive portion and a second lower conductive portion, respectively such that first and second planeparallel plate transmission lines separated from each other by said reactance post members are, respectively, formed by said first upper conductive portion and said first lower conductive portion and by said second upper conductive portion and said second lower conductive portion; and a feed point which is provided at a second position of said dielectric plate for subjecting said upper and lower conductive plates, at their positions corresponding to said second position, to power feed from said feed point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless apparatus comprising a casing, a circuit portion mounted in said casing, and a small antenna, said small antenna comprising:
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a double-sided printed circuit board which has opposite conductive faces; a plurality of conductive reactance post members which are, respectively, provided at a plurality of first positions of said dielectric plate so as to extend between said upper and lower conductive plates such that said upper and lower conductive plates are connected, at their positions corresponding to said first positions, to each other by said reactance post members; said reactance post members dividing said upper and lower conductive plates into a first upper conductive portion and a second upper conductive portion and into a first lower conductive portion and a second lower conductive portion, respectively such that first and second plane-parallel plate transmission lines separated from each other by said reactance post members are, respectively, formed by said first upper conductive portion and said first lower conductive portion and by said second upper conductive portion and said second lower conductive portion; a feed point which is provided at a second position of said dielectric plate for subjecting said upper and lower conductive plates, at their positions corresponding to said second position, to power feed from said feed point; said small antenna being mounted in said casing of said wireless apparatus; and a feeder connected between said feed point and said circuit portion of said wireless apparatus. - View Dependent Claims (12, 13)
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsYamamoto, Junko, Kuboyama, Haruhiro, Fujimoto, Kyohei, Hirasawa, Kazuhiro
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Primary Examiner(s)Nussbaum, Marvin L.
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Application NumberUS06/776,529Time in Patent Office764 DaysField of Search343/700 R, 343/700 MS, 343/772-775, 343/702, 343/705, 343/829-830, 343/907, 343/893, 343/908, 333/236, 333/238, 333/239, 333/245-248US Class Current343/700.0MSCPC Class CodesH01Q 9/0421 with a shorting wall or a s...
