US4007461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna system for deriving cardiod patterns
Assignee: Federal Communications Commission
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Filing: 1975-09-05
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Granted: 1977-02-08
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Expires: 1995-09-05
Abstract
Abstract An Isolation Differential Combiner which accepts signals from two spaced vertical whip antenna elements and which are then combined through delay lines so that the resulting said reception pattern is a cardioid signal pattern at the combiner outputs. The isolation of the two signals is accomplished by connecting wide-band balanced transformers as hybrids. The differential component of the two signals present at the hybrid combiner is available at each secondary winding of each wide-band balanced transformer.
Inventors
- 👤 Arthur Luedtke
- 👤 William L. Kilpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:46
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; H01Q21/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
An isolation differential combiner comprising a left omnidirectional antenna input, a left antenna output, left transformer means having a primary and secondary winding connected therebetween, a right omnidirectional antenna input, a right antenna output, right transformer means having a primary and secondary winding connected therebetween, and each of said transformer means being centertapped for hybrid isolation between opposite ports of said primary, and delay line means crossconnecting said antenna inputs and said transformer primary means resulting in a cardioid signal pattern at said left and right antenna outputs.
Claim 2
Dependent Claim
88 words
An isolation differential combiner comprising a left omnidirectional antenna input, a left antenna output, left transformer means having a primary and secondary winding connected therebetween, a right omnidirectional antenna input, a right antenna output, right transformer means having a primary and secondary winding connected therebetween, and each of said transformer means being centertapped for hybrid isolation between opposite ports of said primary, and delay line means crossconnecting said antenna inputs and said transformer primary means resulting in a cardioid signal pattern at said left and right antenna outputs.
Claim 3
Dependent Claim
17 words
The isolation differential combiner of claim 1 wherein each of said transformer means are wide balanced transformers.
Claim 4
Dependent Claim
25 words
The isolation differential combiner of claim 2 wherein each of said delay lines has a delay which match the separation of the said antenna elements.
Claim 5
Dependent Claim
22 words
The isolation differential combiner of claim 1 wherein each of said secondary of said transformer means has a resistor connected to ground.
Claim 6
Dependent Claim
29 words
The isolation differential combiner of claim 4 wherein the received signal output at the secondary of each transformer is unidirectional with a cardioid azimuth pattern and in opposing directions.
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |