Antenna and acoustic horn apparatus
Abstract
Abstract DISCLOSED ARE ANTENNA AND ACOUSTIC HORN APPARATUS USABLE IN PORTABLE COMMUNICATIONS UNITS, SUCH AS TRANSCEIVERS. ONE SUCH APPARATUS INCLUDES A DIELECTRIC ACOUSTIC HORN POSITIONED WITHIN THE VOLUME OF SPACE BETWEEN TWO PARALLEL PLATES OF AN ANTENNA. THE ACOUSTIC HORN, WHICH TOGETHER WITH THE AIR IN THE VOLUME COMPRISES DIELECTRIC BETWEEN THE ANTENNA PLATES, PROVIDES A PATH OF VARYING ACOUSTIC IMPEDANCE FOR MATCHING THE ACOUSTIC IMPEDANCE OF FREE SPACE TO THE ACOUSTIC IMPEDANCE OF A TRANSDUCER, ALSO INCLUDED IN THE APPARATUS, FOR MORE EFFICIENTLY COUPLING AN ACOUSTIC SIGNAL THEREBETWEEN. AN INDUCTIVE TUNING DEVICE IS CONNECTED BETWEEN THE ANTENNA PLATES TO COMPENSATE FOR THE CAPACITIVE EFFECTS OF ANTENNA DIELECTRIC. OTHER EMBODIMENTS ARE ALSO COVERED.
Inventors
- 👤 William E Buehrle Jr
- 👤 Gerald F Woodard
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |