Patent US1616723A successfully refreshed from Google Patents.
US5420596A
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US
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Quarter-wave gap-coupled tunable strip antenna
Assignee: Quarterhill Inc
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Filing: 1993-11-26
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Granted: 1995-05-30
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Expires: 2013-11-26
Abstract
Abstract An antenna has a quarter wave resonant strip (10) and first and second parasitically excited strips (12 and 14) resonant at a lower and upper frequency, respectively, of the antenna bandwidth. The strips (10, 12 and 14) have trim tabs (20, 22 and 24) for adjusting the resonant frequency of each strip. The location of a feed (30) is set to provide a desired impedance match for use by a radio (60) such as a pager. A ground plane (40) provides a grounding for the strips (10, 12 and 14) and inhibits undesirable radio frequency interaction between the radio (60) and the strips (10, 12 and 14).
Inventors
- 👤 Dennis Burrell
- 👤 Kazimierz Siwiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:52
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/005; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
An antenna for use in a miniature radio device capable of receiving signals in a first frequency band, transmitting signals in a second frequency band, the antenna comprising: a substrate having a first planar surface and a second planar surface; a ground plane affixed to the second planar surface of the substrate; a driven resonant strip affixed to the first planar surface of the substrate; at least a first parasitic strip affixed to the first planar surface and spaced a predetermined distance from the driven resonant strip; grounding means for electrically coupling the first parasitic strip and the driven resonant strip to said ground plane.
Claim 2
Dependent Claim
105 words
An antenna for use in a miniature radio device capable of receiving signals in a first frequency band, transmitting signals in a second frequency band, the antenna comprising: a substrate having a first planar surface and a second planar surface; a ground plane affixed to the second planar surface of the substrate; a driven resonant strip affixed to the first planar surface of the substrate; at least a first parasitic strip affixed to the first planar surface and spaced a predetermined distance from the driven resonant strip; grounding means for electrically coupling the first parasitic strip and the driven resonant strip to said ground plane.
Claim 3
Dependent Claim
29 words
The antenna according to claim 1 further comprising: a second parasitic strip affixed to the first planar surface and spaced from the driven resonant strip by said predetermined distance.
Claim 4
Dependent Claim
55 words
The antenna according to claim 2, and further comprising: a plurality of trim tabs for adjusting a resonant frequency of the antenna, wherein a first of said plurality trim tabs is attached to said driven resonant strip, and a second of said plurality of trim tabs is attached to said first and second parasitic strips.
Claim 5
Dependent Claim
27 words
The antenna of claim 2, wherein the first and second parasitic strips have quarter wave resonant lengths at upper and lower frequencies of operation of the antenna.
Claim 6
Dependent Claim
20 words
The antenna according to claim 1 wherein said driven resonant strip and said first parasitic strip are quarter wave resonant.
Claim 7
Dependent Claim
20 words
The antenna according to claim 1 wherein said driven resonant strip and said first parasitic strip are half wave resonant.
Claim 8
Dependent Claim
34 words
The antenna according to claim 1 wherein said driven resonant strip is substantially rectangular and has a first side, said first parasitically resonant strip being spaced from the first side by said predetermined distance.
Claim 9
Dependent Claim
55 words
The antenna according to claim 7 further comprising: a plate for coupling said driven resonant strip to said first parasitic strip, said plate overlapping and parallel to both said driven resonant strip and said first parasitic strip; and an insulator substrate interposed between said plate and said driven resonant strip and said first parasitic strip.
Claim 10
Dependent Claim
36 words
The antenna according to claim 1, wherein said grounding means comprises a multiplicity of ground posts attached between said ground plane and said driven resonant strip, and between said ground plane and said first parasitic strip.
Claim 11
Dependent Claim
36 words
The antenna according to claim 9 wherein seven of said multiplicity of ground posts are attached to said driven resonant strip, and three of said multiplicity of ground posts are attached to said first parasitic strip.
Claim 12
Dependent Claim
37 words
The antenna according to claim 1 further comprising a feed coupled at a first end to said driven resonant strip and having a second end for coupling to a radio receiver circuit affixed to said ground plane.
Claim 13
Dependent Claim
30 words
The miniature radio device comprising the antenna according to claim 1 further comprising: a radio receiver circuit coupled to the antenna for receiving radio frequency signals received by the antenna.
Claim 14
Dependent Claim
16 words
The device according to claim 12 wherein said radio receiver circuit is a selective call receiver.
Claim 15
Dependent Claim
24 words
The device according to claim 12 further comprising: a radio transmitter circuit coupled to the antenna for transmitting radio frequency signals through the antenna.
Claim 16
Dependent Claim
23 words
The antenna of claim 2, wherein the bandwidth of the antenna is approximately 6.5% of a center frequency of operation of the antenna.
Claim 17
Dependent Claim
18 words
The antenna of claim 15, wherein the center frequency of operation of the antenna is approximately 916 Mhz.
Claim 18
Dependent Claim
15 words
The antenna of claim 1, wherein the bandwidth of the antenna is approximately 60 MHz.
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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) | 1998-05-29 | 1998-11-28 | 1999-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-29 | 2002-11-28 | 2003-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-29 | 2006-11-28 | 2007-05-30 | $7700.00 | Window Closed / Lapsed |