US4516127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three element low profile antenna
Assignee: Motorola Solutions Inc
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Filing: 1983-04-29
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Granted: 1985-05-07
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Expires: 2003-04-29
Abstract
Abstract A low profile antenna is provided which includes a counterpoise above which are situated three parallel oriented L-shaped elements. Each of the elements includes leg and foot portions. One common end of the leg portions of the elements are electrically coupled together and to an antenna trimming stub. The remaining end of the middle element constitutes the feedpoint of the antenna together with the remaining ends of the other two elements. The dimensions of the counterpoise top surface are selected to be substantially less than one wavelength at the desired operating frequency of the antenna. In this manner, the antenna generates or is responsive to radio frequency waves exhibiting two polarizations.
Inventors
- 👤 Kazimierz Siwiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:26
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/42; H01Q1/00; H01Q1/27; H01Q25/00; H01Q25/001; H01Q9/32; H01Q9/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
133 words
An antenna comprising: a counterpoise of electrically conductive material having a first surface; first, second, and third L-shaped elements, each of said elements having respective leg and foot portions and ends, the leg portions of each of said elements being oriented substantially parallel to each other and in a plane substantially parallel to, and a predetermined first distance above said first surface, said second element being situated between said first and third elements, the ends of said first, second, and third elements situated on the leg portions thereof being electrically connected together, the ends of said first and third elements situated on the foot portions thereof being electrically connected to said counterpoise and together with the end of said second element situated on the foot portion thereof constituting the feedpoint of said antenna.
Claim 2
Dependent Claim
133 words
An antenna comprising: a counterpoise of electrically conductive material having a first surface; first, second, and third L-shaped elements, each of said elements having respective leg and foot portions and ends, the leg portions of each of said elements being oriented substantially parallel to each other and in a plane substantially parallel to, and a predetermined first distance above said first surface, said second element being situated between said first and third elements, the ends of said first, second, and third elements situated on the leg portions thereof being electrically connected together, the ends of said first and third elements situated on the foot portions thereof being electrically connected to said counterpoise and together with the end of said second element situated on the foot portion thereof constituting the feedpoint of said antenna.
Claim 3
Dependent Claim
31 words
The antenna of claim 1 wherein the first surface of said counterpoise is substantially rectangular, said first, second, and third elements, being oriented along a diagonal of said rectangular first surface.
Claim 4
Dependent Claim
28 words
The antenna of claim 1 wherein the largest dimension of said counterpoise first surface is substantially less than the wavelength of the desired operating frequency of the antenna.
Claim 5
Dependent Claim
32 words
The antenna of claim 1 wherein the length of said first, second and third element is approximately equal to one quarter of the wavelength of the desired operating frequency of the antenna.
Claim 6
Dependent Claim
32 words
The antenna of claim 1 wherein the first surface of said counterpoise is substantially rectangular, said first, second, and third elements being oriented along a line which lengthwise bisects said rectangular surface.
Claim 7
Dependent Claim
40 words
The antenna of claim 1 including a trimming stub of electrically conductive material situated parallel to the leg portions of said first, second, and third elements and being electrically coupled to the ends of said elements furthest from said feedpoint.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |