US3852760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically small dipolar antenna utilizing tuned lc members
Assignee: United States Department of the Army
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Filing: 1973-08-07
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Granted: 1974-12-03
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Expires: 1993-08-07
Abstract
Abstract A miniaturized dipolar antenna having high radiation efficiency includes two parallel spaced capacitor plates shunting an inductance which is connected in a perpendicular orientation to the plates. In a first embodiment for VHF operation, the inductance is a coil having an adjustable ferrite slug core which permits tuning of the antenna. In lieu of the slug, a coaxial variable capacitor may be connected in series with the plates. In a second embodiment for UHF operation, the inductance consists of parallel positioned conductor rods perpendicularly connected between the capacitor plates. A coaxial variable capacitor connected in series with the plates permits tuning of the antenna.
Inventors
- 👤 F Reggia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:09
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28; H01Q9/0407; H01Q9/0442; H01Q9/30; H01Q9/32; H01Q9/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A miniaturized dipolar antenna comprising: first and second capacitor plates disposed in coaxial parallel spaced relation; a helically wound inductor coil positioned between the plates in coaxial relation thereto for electrical connection therewith to form a tuned LC resonant circuit; adjustably positioned ferrite core coaxially disposed inwardly of the coil for tuning the operating frequency of the antenna; and means connected to the inductor and the capacitor plates for introducing an r.f. signal to the antenna which energizes the inductor and the capacitor plates causing radiation of energy into a far field from the capacitor plates.
Claim 2
Dependent Claim
96 words
A miniaturized dipolar antenna comprising: first and second capacitor plates disposed in coaxial parallel spaced relation; a helically wound inductor coil positioned between the plates in coaxial relation thereto for electrical connection therewith to form a tuned LC resonant circuit; adjustably positioned ferrite core coaxially disposed inwardly of the coil for tuning the operating frequency of the antenna; and means connected to the inductor and the capacitor plates for introducing an r.f. signal to the antenna which energizes the inductor and the capacitor plates causing radiation of energy into a far field from the capacitor plates.
Claim 3
Dependent Claim
63 words
The subject matter set forth in claim 1 wherein a first end of the coil is electrically connected to a first plate while the second end of the coil is electrically connected to a second plate, and further wherein the means for introducing an r.f. signal to the antenna includes a lead from a r.f. input to an intermediate point of the coil.
Claim 4
Dependent Claim
35 words
The subject matter set forth in claim 1 together with a coaxial variable capacitor positioned inwardly of the coil and connected in series with the capacitor plates for tuning the operating frequency of the antenna.
Claim 5
Dependent Claim
98 words
A miniaturized dipolar antenna comprising: first and second capacitor plates disposed in coaxial parallel spaced relation; at least one conductive post perpendicularly mounted between the plates for electrical connection therewith to form a tuned LC resonant circuit; a coaxial variable capacitor positioned adjacent the post and connected in series with the capacitor plates for tuning the operating frequency of the antenna; and means connected to the inductor and capacitor plates for introducing an r.f. signal to the antenna which energizes the inductor and the capacitor plates causing radiation of energy into a far field from the capacitor plates.
Claim 6
Dependent Claim
98 words
A miniaturized dipolar antenna comprising: first and second capacitor plates disposed in coaxial parallel spaced relation; at least one conductive post perpendicularly mounted between the plates for electrical connection therewith to form a tuned LC resonant circuit; a coaxial variable capacitor positioned adjacent the post and connected in series with the capacitor plates for tuning the operating frequency of the antenna; and means connected to the inductor and capacitor plates for introducing an r.f. signal to the antenna which energizes the inductor and the capacitor plates causing radiation of energy into a far field from the capacitor plates.
Claim 7
Dependent Claim
24 words
The subject matter of claim 4 wherein a plurality of symmetrically arranged conductive posts are mounted between the capacitor plates for electrical connection therewith.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |