US3774218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial cable loop antenna with unidirectional current amplifier opposite the output
Assignee: Individual
•
Filing: 1972-01-18
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Granted: 1973-11-20
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Expires: 1992-01-18
Abstract
Abstract Disclosed is an antenna system having a second loop disposed immediately adjacent and coupled to the primary field detecting or transmitting loop for neutralizing inductive reactance through the primary loop. Unidirectional current means which is disclosed as a low input impedance, high output impedance, unity gain current amplifier couples the primary and secondary loop for preventing significant current flow through the secondary loop except ina direction opposite that of the current flow through the primary loop, the primary and secondary loop, respectively, being the shield and center conductor of a coaxial cable, the center conductor coupled to signal utilizaton or transmitting means for processing or generating electromagnetic signal waves.
Inventors
- 👤 C Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:52
CPC Classifications
H; H01; H01Q; H01Q23/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A loop antenna receiving system, comprising: a. a coaxial cable composed of an outer shield providing a primary loop antenna for receiving externally generated electromagnetic signals and a center conductor disposed adjacent to said outer shield for providing a secondary conductive loop, said primary and secondary loops having opposite end portions, b. unidirectional current means coupling said outer shield to said center conductor at one end portion of said loops for preventing any significant current flow through said secondary loop except in a direction opposite the direction of current flow through said primary loop, whereby the inductive reactance associated with said primary loop conductor is effectively neutralized at a current flow through said secondary loop, said unidirectional current means being a low input impedance, high output impedance, unity gain current amplifier, and c. signal utilization means at the opposite end portion of said loops coupled to said center conductor of said coaxial cable for processing the said received externally generated electromagnEtic signals.
Claim 2
Dependent Claim
162 words
A loop antenna receiving system, comprising: a. a coaxial cable composed of an outer shield providing a primary loop antenna for receiving externally generated electromagnetic signals and a center conductor disposed adjacent to said outer shield for providing a secondary conductive loop, said primary and secondary loops having opposite end portions, b. unidirectional current means coupling said outer shield to said center conductor at one end portion of said loops for preventing any significant current flow through said secondary loop except in a direction opposite the direction of current flow through said primary loop, whereby the inductive reactance associated with said primary loop conductor is effectively neutralized at a current flow through said secondary loop, said unidirectional current means being a low input impedance, high output impedance, unity gain current amplifier, and c. signal utilization means at the opposite end portion of said loops coupled to said center conductor of said coaxial cable for processing the said received externally generated electromagnEtic signals.
Claim 3
Dependent Claim
26 words
The system as described in claim 1 wherein said amplifier has its input coupled to said outer shield and its output coupled to said center conductor.
References Cited (Backward Citations)
US3441935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |