Patent US4701763A successfully refreshed from Google Patents.
US4701763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small antenna
Assignee: Panasonic Holdings Corp
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Filing: 1985-09-16
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Granted: 1987-10-20
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Expires: 2005-09-16
Abstract
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.
Inventors
- 👤 Junko Yamamoto
- 👤 Kyohei Fujimoto
- 👤 Kazuhiro Hirasawa
- 👤 Haruhiro Kuboyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:57
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0421
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
239 words
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.
Claim 2
Dependent Claim
239 words
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.
Claim 3
Dependent Claim
23 words
A small antenna as claimed in claim 1, wherein at least one of said upper and lower conductive plates has a rectangular shape.
Claim 4
Dependent Claim
33 words
A small antenna as claimed in claim 1, wherein said reactance posts are arranged along a straight line extending at right angles to a longitudinal direction of said upper and lower conductive plates.
Claim 5
Dependent Claim
36 words
A small antenna as claimed in claim 1, wherein at least one of said first and second plane-parallel plate transmission lines has a length equal to an odd number multiplied by a quarter of said wavelength.
Claim 6
Dependent Claim
26 words
A small antenna as claimed in claim 4, wherein each of said upper and lower conductive plates has a rectangular shape and has a steplike recess.
Claim 7
Dependent Claim
25 words
A small antenna as claimed in claim 1, wherein said feed point is offset from a longitudinal centerline of said upper and lower conductive plates.
Claim 8
Dependent Claim
22 words
A small antenna as claimed in claim 1, further comprising a reactance element loaded on at least one of said reactance posts.
Claim 9
Dependent Claim
16 words
A small antenna as claimed in claim 7, wherein said reactance element has a variable reactance.
Claim 10
Dependent Claim
32 words
A small antenna as claimed in claim 1, further comprising a reactance element loaded between one end portion of said upper conductive plate and one end portion of said lower conductive plate.
Claim 11
Dependent Claim
23 words
A small antenna as claimed in claim 1, wherein at least one of said reactance post members is a piston type variable condenser.
Claim 12
Dependent Claim
237 words
A wireless apparatus comprising a casing, a circuit portion mounted in said casing, and a small antenna, said small antenna comprising: 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.
Claim 13
Dependent Claim
237 words
A wireless apparatus comprising a casing, a circuit portion mounted in said casing, and a small antenna, said small antenna comprising: 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.
Claim 14
Dependent Claim
51 words
A wireless apparatus as claimed in claim 11, in which said small antenna is attached to the inner face of a front wall of said casing, and further comprising a clip for attaching said casing to an operator and mounted on the outer face of a rear wall of said casing.
Claim 15
Dependent Claim
16 words
A wireless apparatus as claimed in claim 11, wherein said post members are conductive hollow members.
References Cited (Backward Citations)
US4197544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |