US4547776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loop antenna with improved balanced feed
Assignee: United States Department of the Navy
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Filing: 1983-11-03
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Granted: 1985-10-15
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Expires: 2003-11-03
Abstract
Abstract Loop radiating elements for microwave frequencies which result in balancedower division at the feed points and equi-phase currents in the radiating segments are in the form of an Alford loop design having a "kink" in the stripline path on the side of a printed circuit board opposite the cross-over to restore equal path lengths on both sides of a central feed terminal. Alternatively, the radiating segments of a loop may be in the form of end-loaded bent dipoles which are dual-fed on diametrically opposite points of the loop with equi-phase and amplitude signal. The result is loop radiating elements which have an axial null with a symmetrical doughnut radiating pattern.
Inventors
- 👤 Conway A. Bolt, Jr.
- 👤 John W. Cassen
- 👤 Helmut E. Schrank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:14
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
An improved Alford loop radiating element of the type having four radiating segments in a square configuration, a pair of center fed terminals, and a cross-over connection on one side of the feed terminals with two parts of the loop being on opposite sides of a printed circuit board, the improvement comprising a kink in the loop path on the side of said printed circuit board opposite said cross-over connection to add a path length equal to that of the crossed paths such that there is a balanced power division at said feed terminals and equi-phase currents in said radiating segments.
Claim 2
Dependent Claim
101 words
An improved Alford loop radiating element of the type having four radiating segments in a square configuration, a pair of center fed terminals, and a cross-over connection on one side of the feed terminals with two parts of the loop being on opposite sides of a printed circuit board, the improvement comprising a kink in the loop path on the side of said printed circuit board opposite said cross-over connection to add a path length equal to that of the crossed paths such that there is a balanced power division at said feed terminals and equi-phase currents in said radiating segments.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |