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US3833908A
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Back-fire loop antenna
Assignee: Individual
•
Filing: 1973-07-25
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Granted: 1974-09-03
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Expires: 1993-07-25
Abstract
Abstract A back-fire loop antenna having a loop of one or more turns situated between a pair of reflectors parallel with the plane of the loop, one reflector being larger than the other, there being means for supporting the loop and the reflectors in the required positions.
Inventors
- 👤 S Loh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:25
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/185
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A backfire loop antenna consisting of a driving element in the form of a conductive loop of at least one turn having a circumference approximating one wavelength at the frequency of operation; a first plane conductive reflector parallel to the plane of the loop spaced apart therefrom on the axis thereof; a second plane conductive reflector parallel to the plane of the loop on the axis thereof and on the side thereof remote from the first conductive reflector, the second reflector being smaller than the first reflector; and support means for supporting the loop and the first and second conductive reflectors in their said relative positions.
Claim 2
Dependent Claim
106 words
A backfire loop antenna consisting of a driving element in the form of a conductive loop of at least one turn having a circumference approximating one wavelength at the frequency of operation; a first plane conductive reflector parallel to the plane of the loop spaced apart therefrom on the axis thereof; a second plane conductive reflector parallel to the plane of the loop on the axis thereof and on the side thereof remote from the first conductive reflector, the second reflector being smaller than the first reflector; and support means for supporting the loop and the first and second conductive reflectors in their said relative positions.
Claim 3
Dependent Claim
41 words
A backfire loop antenna as claimed in claim 1 wherein the support means is a common axial shaft on which the loop and reflectors are mounted and which is of insulating material or from which the loop and reflectors are insulated.
Claim 4
Dependent Claim
20 words
A backfire loop antenna as claimed in claim 2 wherein one or each reflector is adjustably mounted on the shaft.
Claim 5
Dependent Claim
25 words
A backfire loop antenna as claimed in claim 1 wherein the reflectors are spaced apart a distance not greater than the circumference of the loop.
Claim 6
Dependent Claim
20 words
A backfire loop antenna as claimed in claim 1 wherein one or each refelctor is constituted by a conductive mesh.
Claim 7
Dependent Claim
27 words
A backfire loop antenna as claimed in claim 1 wherein the first reflector has a minimum linear dimension which is greater than the circumference of the loop.
Claim 8
Dependent Claim
30 words
A backfire loop antenna as claimed in claim 1 wherein the second reflector has a minimum linear dimension which is greater than one quarter of the circumference of the loop.
References Cited (Backward Citations)
US3491361A
Cited
US3438043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |