US3978487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupled fed electric microstrip dipole antenna
Assignee: United States Department of the Navy
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Filing: 1975-04-24
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Granted: 1976-08-31
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Expires: 1995-04-24
Abstract
Abstract A coupled fed electric microstrip dipole antenna consisting of a thin eleically conducting, rectangular-shaped radiating element (resonator) and a nonradiating coupler formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. There is only a single mode of oscillation. Oscillation takes place along the length of the radiating element, and the length determines the resonant frequency. The feed point is normally located at the end of the coupler; energy is in turn coupled to the radiating element. Input impedance matching is determined by a combination of the coupler length and the separation between the coupler and the radiating element.
Inventors
- 👤 Cyril M. Kaloi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:08
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/40; H01Q9/0407; H01Q9/045; H01Q9/0457
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
A coupled fed electric microstrip dipole antenna having low physical profile and conformal arraying capability, comprising: a. a thin ground plane conductor; b. a thin rectangular microstrip radiating element and a separate smaller thin rectangular shaped microstrip nonradiating coupler alongside and spaced apart from said radiating element; c. said radiating element and nonradiating coupler being parallel to each other in the same plane and equally spaced from said ground plane; d. said radiating element and nonradiating coupler being electrically separated from said ground plane by a dielectric substrate; e. said nonradiating coupler being fed from a coaxial-to-microstrip adapter, the center pin of said adapter extending through said ground plane and dielectric substrate to a feedpoint on said nonradiating coupler; f. the length of said radiating element determining the resonant frequency of said antenna; g. the antenna input impedance being variable to match most practical impedances by varying the coupler length and the distance between said radiating element and nonradiating coupler without affecting the antenna radiation pattern.
Claim 2
Dependent Claim
166 words
A coupled fed electric microstrip dipole antenna having low physical profile and conformal arraying capability, comprising: a. a thin ground plane conductor; b. a thin rectangular microstrip radiating element and a separate smaller thin rectangular shaped microstrip nonradiating coupler alongside and spaced apart from said radiating element; c. said radiating element and nonradiating coupler being parallel to each other in the same plane and equally spaced from said ground plane; d. said radiating element and nonradiating coupler being electrically separated from said ground plane by a dielectric substrate; e. said nonradiating coupler being fed from a coaxial-to-microstrip adapter, the center pin of said adapter extending through said ground plane and dielectric substrate to a feedpoint on said nonradiating coupler; f. the length of said radiating element determining the resonant frequency of said antenna; g. the antenna input impedance being variable to match most practical impedances by varying the coupler length and the distance between said radiating element and nonradiating coupler without affecting the antenna radiation pattern.
Claim 3
Dependent Claim
32 words
An antenna as in claim 1 wherein the ground plane conductor extends at least one wavelength in each direction beyond the edges of the antenna element to minimize any possible backlobe radiation.
Claim 4
Dependent Claim
24 words
An antenna as in claim 1 wherein the feedpoint of said nonradiating coupler is at one end of the centerline along the length thereof.
Claim 5
Dependent Claim
22 words
An antenna as in claim 1 wherein a plurality of said radiating elements are arrayed to provide a near isotropic radiation pattern.
Claim 6
Dependent Claim
17 words
An antenna as in claim 1 wherein the length of said radiating element is approximately 1/2 wavelength.
Claim 7
Dependent Claim
29 words
An antenna as in claim 1 wherein the feedpoint of said nonradiating coupler is along the uncoupled edge of the coupler, which is farthest away from said radiating element.
Claim 8
Dependent Claim
23 words
An antenna as in claim 1 wherein said thin rectangular radiating element and coupler are formed on one surface of said dielectric substrate.
Claim 9
Dependent Claim
30 words
An antenna as in claim 1 wherein the minimum width of said radiating element is determined by the equivalent internal resistance of the conductor plus any loss due the dielectric.
Claim 10
Dependent Claim
28 words
An antenna as in claim 1 wherein the antenna electrical characteristics are varied by varying the position of said nonradiating coupler alongside the length of said radiating element.
References Cited (Backward Citations)
US3016536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |