Patent US3972050A successfully refreshed from Google Patents.
US3972050A
Expired / Lapsed
US
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End fed electric microstrip quadrupole antenna
Assignee: United States Department of the Navy
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Filing: 1975-04-24
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Granted: 1976-07-27
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Expires: 1995-04-24
Abstract
Abstract An end fed electric microstrip quadrupole antenna consisting of a thin elrically conducting, rectangular-shaped element formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. The feed point is located at one end of the centerline of the antenna length. The antenna bandwidth increases with the width of the element and spacing between the element and ground plane. The end fed microstrip quadrupole antenna operates in a degenerate mode, i.e., two oscillation modes occurring at the same frequency. Along the element length, the oscillation occurs in a dipole mode (fundamental mode) whereas along the element width the oscillation occurs in a quadrupole mode (higher order mode). The corners nearest the feed point may be used for fine tuning of the antenna by trimming small strips of copper from the corner.
Inventors
- 👤 Cyril M. Kaloi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q13/00; H01Q13/08; H01Q9/30; H01Q9/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
An end fed electric microstrip quadrupole antenna having low physical profile and conformal arraying capability, comprising: a. a thin ground plane conductor; b. a thin rectangular radiating element spaced from said ground plane; c. said radiating element being electrically separated from said ground plane by a dielectric substrate; d. said radiating element having a feed point located at the end of the length on the centerline thereof; e. said radiating element being fed from a coaxial-to-microstrip adapter, the center pin of said adapter extending through said ground plane and dielectric substrate to said radiating element; f. the length of said radiating element determining the resonant frequency of said antenna; the length of said radiating element being approximately one-half wavelength and the width being approximately one wavelength to provide quadrupole action; g. said antenna operating in a degenerate mode with two oscillation modes occurring at the same frequency, oscillation in a dipole mode occurring along the length of the element and oscillation in a quadrupole mode occurring along the width of the element; h. the antenna bandwidth being variable with the width of the radiating element and the spacing between said radiating element and said ground plane, said spacing between the radiating element and the ground plane having somewhat greater effect on the bandwidth than the element width.
Claim 2
Dependent Claim
217 words
An end fed electric microstrip quadrupole antenna having low physical profile and conformal arraying capability, comprising: a. a thin ground plane conductor; b. a thin rectangular radiating element spaced from said ground plane; c. said radiating element being electrically separated from said ground plane by a dielectric substrate; d. said radiating element having a feed point located at the end of the length on the centerline thereof; e. said radiating element being fed from a coaxial-to-microstrip adapter, the center pin of said adapter extending through said ground plane and dielectric substrate to said radiating element; f. the length of said radiating element determining the resonant frequency of said antenna; the length of said radiating element being approximately one-half wavelength and the width being approximately one wavelength to provide quadrupole action; g. said antenna operating in a degenerate mode with two oscillation modes occurring at the same frequency, oscillation in a dipole mode occurring along the length of the element and oscillation in a quadrupole mode occurring along the width of the element; h. the antenna bandwidth being variable with the width of the radiating element and the spacing between said radiating element and said ground plane, said spacing between the radiating element and the ground plane having somewhat greater effect on the bandwidth than the element width.
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
32 words
An antenna as in claim 1 wherein the corners of said thin radiating element nearest said feed point being used for fine tuning said antenna by trimming small strips from said corners.
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
28 words
An antenna as in claim 1 wherein the antenna input impedance is matched to most practical impedances by matching microstrip transmission line without affecting the antenna radiation pattern.
Claim 7
Dependent Claim
20 words
An antenna as in claim 1 wherein said thin radiating element is formed on one surface of said dielectric substrate.
References Cited (Backward Citations)
US3810183A
Cited
US3811128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |