US3562756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple polarization spiral antenna
Assignee: Texas Instruments Inc
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Filing: 1968-06-03
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Granted: 1971-02-09
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Expires: 1988-06-03
Abstract
Abstract APPARATUS AND A METHOD OF EXCITING A MULTI-ELEMENT LOG SPIRAL ANTENNA TO OBTAIN LEFT-HAND AND RIGHT-HAND CIRCULAR POLARIZATION RADIATION. THE ANTENNA ELEMENTS ARE INTERWOUND IN THE USUAL MANNER IN TE FORM OF EITHER EQUIANGULAR OR ARCHIMEDES SPIRALS TERMINATED AT A CIRCUMFERENCE CONSISTENT WITH A DESIRED RADIATION PATTERN. EACH ELEMENT OF THE ANTENNA RECEIVES MULTIPLE CURRENT MODE EXCITATION AT THE INNER TERMINALS. TYPICALLY, AN ANTENNA EXCITED BY FIRST, SECOND, FOURTH, AND FIFTH MODE CURRENTS PRODUCES BOTH LEFT-HAND AND RIGHT-HAND, FIRST AND SECOND MODE, CIRCULAR POLARIZED RADIATION WHEN TERMINATED AT AN APPROPRIATE CIRCUMFERENCE.
Inventors
- 👤 Samuel Chung-Shu Kuo
- 👤 Charles Chung-Yeh Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:46
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |