Patent US4184164A successfully refreshed from Google Patents.
US4184164A
Expired / Lapsed
US
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Directive loop antenna
Assignee: Monogram Industries Inc
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Filing: 1977-12-27
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Granted: 1980-01-15
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Expires: 1997-12-27
Abstract
Abstract A square-loop directive antenna of half wavelength circumference is provided with improved front-to-back ratio and gain by placing capacitive reactances for 90° phase shift in the sides, instead of inductive reactances as in the past, and with further improved front-to-back ratio and gain by placing divided reactances (inductive or capacitive) in the sides with just enough reactance to provide a phase shift of 22.5° next to the driven side of the loop and the balance (90°-22.5°) next to the parasitic side of the loop.
Inventors
- 👤 Robert L. Rod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:12
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/265; H01Q7/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A square-loop directive antenna of half wavelength circumference driven at the center of one side and including capacitive reactances in the adjacent sides for a phase shift in the antenna voltage with respect to antenna current of 90° across each of said adjacent sides, wherein said capacitive reactance on each side is divided into two parts, one part situation next to said driven side of the loop and the other part situated next to the side of the loop opposite said driven side, and wherein said one part of capacitive reactance in each side provides a phase shift equal to about 22.5°, and the other part a phase shift equal to about 67.5°.
Claim 2
Dependent Claim
113 words
A square-loop directive antenna of half wavelength circumference driven at the center of one side and including capacitive reactances in the adjacent sides for a phase shift in the antenna voltage with respect to antenna current of 90° across each of said adjacent sides, wherein said capacitive reactance on each side is divided into two parts, one part situation next to said driven side of the loop and the other part situated next to the side of the loop opposite said driven side, and wherein said one part of capacitive reactance in each side provides a phase shift equal to about 22.5°, and the other part a phase shift equal to about 67.5°.
Claim 3
Dependent Claim
83 words
A square-loop directive antenna of half wavelength circumference driven at the center of one side and including reactances in the adjacent sides for a phase shift in the voltage with respect to antenna current of 90°, said reactances on each side being divided into two parts, one part sufficient to provide a phase shift equal to about 22.5° situated next to said driven side of the loop and the other part situated next to the side of the loop opposite said driven side.
Claim 4
Dependent Claim
83 words
A square-loop directive antenna of half wavelength circumference driven at the center of one side and including reactances in the adjacent sides for a phase shift in the voltage with respect to antenna current of 90°, said reactances on each side being divided into two parts, one part sufficient to provide a phase shift equal to about 22.5° situated next to said driven side of the loop and the other part situated next to the side of the loop opposite said driven side.
Claim 5
Dependent Claim
26 words
A square-loop directive antenna as defined in claim 2 wherein each of said capacitive reactances is comprised of a conductive tube and an inner insulated conductor.
Claim 6
Dependent Claim
90 words
A square-loop directive antenna as defined in claim 3 wherein said conductive tubes forms at least a part of the side of said loop antenna that includes the reactance, and said inner insulated conductor is formed from a conductor of an adjoining side by bending the conductor of a length just sufficient to be inserted into the conductive tube to an extent necessary to provide the required capacitive reactance, and insulating the bent conductor at least over the extent to be inserted into said tube to provide a coaxial capacitor.
References Cited (Backward Citations)
DE334655C
Cited
US2166750A
Cited
US2311872A
Cited
FR978294A
Cited
US3078462A
Cited
US3151328A
Cited
US3971031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |