US3623113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced tunable helical monopole antenna
Assignee: CHU ASSOCIATES
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Filing: 1969-08-21
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Granted: 1971-11-23
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Expires: 1989-08-21
Abstract
Abstract This disclosure deals with a novel balanced tunable helical monopole antenna, that, through a symmetrical construction involving a central feed and simultaneous turn-shorting tuning from the ends thereof, enables the obviating of the necessity for a ground plane.
Inventors
- 👤 Ivan M Faigen
- 👤 Valor C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:33
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q1/362; H01Q9/00; H01Q9/04; H01Q9/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A balanced tunable helical monopole antenna which obviates the need for a ground plane, having, in combination, a continuous helical monopole winding, means for feeding the winding disposed centrally thereof such that the radiation pattern of the helical winding extends in a plane normal to the winding axis, a pair of similar terminal antenna elements, one connected to each end of the helical winding and each provided with shorting means for contacting the turns of the helical winding thereadjacent, and means for synchronously adjusting said shorting means towards and away from the center of the helical winding to tune the antenna.
Claim 2
Dependent Claim
101 words
A balanced tunable helical monopole antenna which obviates the need for a ground plane, having, in combination, a continuous helical monopole winding, means for feeding the winding disposed centrally thereof such that the radiation pattern of the helical winding extends in a plane normal to the winding axis, a pair of similar terminal antenna elements, one connected to each end of the helical winding and each provided with shorting means for contacting the turns of the helical winding thereadjacent, and means for synchronously adjusting said shorting means towards and away from the center of the helical winding to tune the antenna.
Claim 3
Dependent Claim
16 words
An antenna as claimed in claim 1 and in which said terminal elements are dipole elements.
Claim 4
Dependent Claim
26 words
An antenna as claimed in claim 2 and in which said dipole elements are cylindrical devices of cross dimension comparable to that of the helical winding.
Claim 5
Dependent Claim
24 words
An antenna as claimed in claim 1 and in which said terminal elements are linear elements extending substantially parallel with the said winding axis.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |