US4835540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microstrip antenna
Assignee: Mitsubishi Electric Corp
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Filing: 1986-09-11
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Granted: 1989-05-30
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Expires: 2006-09-11
Abstract
Abstract A microstrip antenna offering a wide bandwidth while suppressing the standing wave ratio is obtained by interposing a conductor plate between a radiating conductor element and a ground plane conductor.
Inventors
- 👤 Tetsuo Haruyama
- 👤 Kuniaki Shiramatsu
- 👤 Shigeo Udagawa
- 👤 Yukihir0 Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:27
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/045; H01Q9/0414
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
163 words
In the microstrip antenna having a radiating conductor element of an open-circuited plane circuit on a dielectric substrate which is thinner than the wavelength, a feeder being connected to the radiating conductor element from the rear of a ground plane conductor disposed on the opposite side of the substrate from said radiating conductor element, the improvement comprising a conductor plate disposed between and parallel to the radiating conductor element and the ground plane conductor and electrically isolated from said ground plane conductor, the feeder being electrically conductively connected to the conductor plate and the radiating conductor element, said radiating conductor element having an area facing said conductor plate that is greater than the facing area of said conductor plate, said conductor plate being disposed in the dielectric substrate at an intermediate position between said radiating conductor element and said conductor plate and positioned solely in the area between and commonly defined by the periphery of the radiating conductor element and ground plane conductor.
Claim 2
Dependent Claim
163 words
In the microstrip antenna having a radiating conductor element of an open-circuited plane circuit on a dielectric substrate which is thinner than the wavelength, a feeder being connected to the radiating conductor element from the rear of a ground plane conductor disposed on the opposite side of the substrate from said radiating conductor element, the improvement comprising a conductor plate disposed between and parallel to the radiating conductor element and the ground plane conductor and electrically isolated from said ground plane conductor, the feeder being electrically conductively connected to the conductor plate and the radiating conductor element, said radiating conductor element having an area facing said conductor plate that is greater than the facing area of said conductor plate, said conductor plate being disposed in the dielectric substrate at an intermediate position between said radiating conductor element and said conductor plate and positioned solely in the area between and commonly defined by the periphery of the radiating conductor element and ground plane conductor.
Claim 3
Dependent Claim
35 words
The microstrip antenna as set forth in claim 1 wherein the ratio of the area of the radiating conductor element to the area of the conductor plate is in a range of 4:1 to 8:1.
Claim 4
Dependent Claim
125 words
In a microstrip antenna having a radiating conductor element of an open-circuited plane circuit on a dielectric substrate which is thinner than the wavelength, a coaxial line for feeding being provided at the rear of a ground plane conductor disposed on the opposite side of the substrate from said radiating conductor element, the improvement comprising a conductor plate disposed between and parallel to the radiating conductor element and the ground plane conductor and electrically isolated from said ground plane conductor, the center conductor of the coaxial line being electrically conductively connected to the conductor plate and the radiating conductor element, the ratio of the area of the radiating conductor element to the area of the conductor plate being in a range of 4:1 to 8:1.
Claim 5
Dependent Claim
125 words
In a microstrip antenna having a radiating conductor element of an open-circuited plane circuit on a dielectric substrate which is thinner than the wavelength, a coaxial line for feeding being provided at the rear of a ground plane conductor disposed on the opposite side of the substrate from said radiating conductor element, the improvement comprising a conductor plate disposed between and parallel to the radiating conductor element and the ground plane conductor and electrically isolated from said ground plane conductor, the center conductor of the coaxial line being electrically conductively connected to the conductor plate and the radiating conductor element, the ratio of the area of the radiating conductor element to the area of the conductor plate being in a range of 4:1 to 8:1.
Claim 6
Dependent Claim
28 words
The microstrip antenna as set forth in claim 1 or 3 wherein said conductor plate is spaced from said radiating conductor element by at least one dielectric layer.
Claim 7
Dependent Claim
17 words
The microstrip antenna as set forth in claim 4 wherein said dielectric layer comprises an air layer.
Claim 8
Dependent Claim
18 words
The microstrip antenna as set forth in claim 1 or 3 wherein said open-circuited plane circuit is circular.
Claim 9
Dependent Claim
18 words
The microstrip antenna as set forth in claim 1 or 3 wherein said open-circuited plane circuit is rectangular.
Claim 10
Dependent Claim
27 words
The microstrip antenna as set forth in claims 1 or 3 wherein said radiating conductor element has a feed point disposed off-center of said radiating conductor element.
References Cited (Backward Citations)
DE2814505A1
Cited
US4318107A
Cited
JPS5593305A
Cited
JPS5791003A
Cited
SU1103316A1
Cited
GB2147744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |