Wide range tunable transmitting loop antenna
Abstract
Abstract THIS SPECIFICATION DISCLOSED A LOOP ANTENNA WHICH EMPLOYS A NVEL AND UNIQUE FEED SCHEME PERMITTING A TUNING RANGE OF UP TO 10:1 WITH A NEARLY CONSTANT INPUT IMPEDANCE AND HIGH EFFICIENBY. THE ANTENNA IS USEFUL FOR BOTH RECEIVING AND HIGH POWER TRANSMITTING APPLICATIONS AND SHOULD FIND PARTICULAR USEFULNESS IN THE HIGH FREQUENCY RANGE OF 2-30 MHZ. THE ANTENNA CONSISTS OF A SINGLE TURN TNED PRIMARY FED BY A SMALL, SINGLE TURN UNTUNED SECONDARY. BY PROPER ADJUSTMENT OF THE RATIO BETWEEN THE DIAMETERS OF THE PRIMARY AND SECONDARY LOOPS, AN ACCURATE MATCH TO A LOW IMPEDANCE CABLE (50 OHMS) MAY BE ACHIEVED OVER THE ENTIRE TUNING RANGE. MINIMUM EFFICIENCIES OF 30 PERCENT ARE ATTAINABLE WITH PRACTICAL DESIGNS HAVING A DIAMETER OF ONLY 5 FEET FOR 3-15 MEGAHERTZ COVERAGE.
Inventors
- 👤 John H Dunlavy Jr
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |