US4115783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband hybrid monopole antenna
Assignee: United States Department of the Army
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Filing: 1977-06-14
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Granted: 1978-09-19
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Expires: 1997-06-14
Abstract
Abstract A new type of radiating structure with rugged high frequency design comprng essentially a single hybrid monopole which utilizes capacitive coupling from a open-ended transmission line to accomplish its broadband characteristics. The monopole is a metal conductor concentric with the transmission line and is separated from a ground plane by an adjustable gap that may be effectively used for fine tuning the antenna. By utilizing helical springs as the conductors this hybrid monopole antenna has self-erecting or pop-up design capability.
Inventors
- 👤 Frank Reggia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:04
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/44; H01Q1/00; H01Q1/08; H01Q9/30; H01Q9/32; H01Q9/38
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A broadband hybrid monopole antenna which comprises: a metal ground plane; a metal inner conductor feed network passing through the ground plane and extending approximately 1/4 of the operating wavelength above the plane; a metal outer conductor whose length is slightly less than 1/4 of the operating wavelength, concentric with the inner conductor and capacitively coupled to the ground plane; and an rf input with one conductor electrically coupled to the input end of the inner conductor for feeding electromagnetic energy into the inner conductor and the second conductor electrically coupled to the ground plane, wherein electromagnetic energy is capacitively coupled to the outer conductor.
Claim 2
Dependent Claim
105 words
A broadband hybrid monopole antenna which comprises: a metal ground plane; a metal inner conductor feed network passing through the ground plane and extending approximately 1/4 of the operating wavelength above the plane; a metal outer conductor whose length is slightly less than 1/4 of the operating wavelength, concentric with the inner conductor and capacitively coupled to the ground plane; and an rf input with one conductor electrically coupled to the input end of the inner conductor for feeding electromagnetic energy into the inner conductor and the second conductor electrically coupled to the ground plane, wherein electromagnetic energy is capacitively coupled to the outer conductor.
Claim 3
Dependent Claim
20 words
The antenna as set forth in claim 1 wherein the capacitive coupling is achieved through a dielectric which is air.
Claim 4
Dependent Claim
18 words
The antenna as set forth in claim 1 wherein the capacitive coupling is achieved through a solid dielectric.
Claim 5
Dependent Claim
22 words
The antenna as set forth in claim 3 which also comprises a dielectric spacer inserted at the input end of the antenna.
Claim 6
Dependent Claim
28 words
The antenna as set forth in claim 4 which also comprises a dielectric spacer inserted at the open end of the antenna between the inner and outer conductors.
Claim 7
Dependent Claim
19 words
The antenna as set forth in claim 3 wherein the inner conductor is part of a coaxial transmission line.
Claim 8
Dependent Claim
18 words
The antenna as set forth in claim 6 wherein the outer conductor has a flange at the base.
Claim 9
Dependent Claim
27 words
The antenna as set forth in claim 3 wherein the outer conductor comprises a tapered helical spring with overlapping elements which forms a tapered tube when extended.
Claim 10
Dependent Claim
27 words
The antenna as set forth in claim 8 wherein the inner conductor comprises a tapered helical spring with overlapping elements which forms a tapered tube when extended.
Claim 11
Dependent Claim
17 words
The antenna as set forth in claim 1 wherein the ground plane is a flat metal surface.
Claim 12
Dependent Claim
15 words
The antenna as set forth in claim 1 wherein the ground plane comprises horizontal radials.
Claim 13
Dependent Claim
42 words
The antenna as set forth in claim 11 wherein the horizontal radials comprise spring-steel tapes which in their compressed position are wound over one another to form a cylinder and in their free position extend radially outward to form the ground plane.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |