Vertical radiator antenna structure which eliminates the necessity of a ground plane
Abstract
Abstract A HIGH FREQUENCY ANTENNA WHICH COMPRISES A TWO SECTION VERTICAL RADIATOR. (CUT TO THE MEDIAM FREQUENCY) APPROXIMATELY FIVE-EIGHTS WAVELENGTH LONG AT ITS HIGHEST OPERATING FREQUENCY. ONE-HALF WAVELENGTH AT ITS LOWEST OPERATING FREQUENCY, WHICH IS END-FED BY A COAXIAL FEED THROUGH THE BASE OF THE RADIATOR. THE POWER SUPPLIED TO THE COAXIAL FEED IS FED SO AS TO BE RESONANT TO THE UPPER AND LOWER FREQUENCY LIMITS OF THE RADIATOR THEREBY SHIFTING THE CURRENT LOBE AWAY FROM THE BASE, IN EFFECT MAINTAINING NEAR ZERO CURRENT AT THE BASE OF THE RADIATOR. THIS PRODUCES A RADIATOR WHICH IS NOT DEPENDENT UPON A GROUND PLANE AND WHICH PATTERN WHILE VERTICALLY POLARIZED IS HORIZONTAL AND OMINIDIRECTIONAL. IN EFFECT, THE ANTENNA ACTS AS A DUPOLE AT LOWEST FREQUENCY AND A DISPLACED ONE-FOURTH WAVE SECTION AT HIGHEST FREQUENCY.
Inventors
- 👤 William Hampton
Bibliographic Details
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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 |