EP0174068A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to microstrip antennas
Assignee: UK Secretary of State for Defence
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Filing: 1985-06-28
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Granted: —
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Expires: 2005-06-28
Abstract
Abstract The bandwidth of a microstrip circular patch antenna (1) of approximately half-wavelength diameter at the resonant frequency is increased by surrounding it with an annular conducting sheet (6) of approximately quarter-wavelength width separated from the patch (1) by a gap (5) and having its outer edge connected to the ground-plane (3). The resulting structure is particularly suitable for feeding a reflector antenna.
Inventors
- 👤 Peter Scott Hall
- 👤 Christopher John Prior
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 14:55
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/18; H01Q19/00; H01Q19/005; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0464
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A microstrip antenna comprising: a dielectric substrate having a conducting sheet radiator on a first face thereof and a conducting ground-plane on its second face, said radiator being dimensioned to be resonant at the operating frequency and having feed means connected to the radiator; and a closed annular conducting sheet on said first face surrounding said radiator and having its inner edge spaced by a gap from the edge of said radiator to provide capacitative coupling across the gap between the respective edges; the outer edge of said annular sheet being dimensioned to be resonantly energisable at said operating frequency via said capacitative coupling.
Claim 2
Dependent Claim
104 words
A microstrip antenna comprising: a dielectric substrate having a conducting sheet radiator on a first face thereof and a conducting ground-plane on its second face, said radiator being dimensioned to be resonant at the operating frequency and having feed means connected to the radiator; and a closed annular conducting sheet on said first face surrounding said radiator and having its inner edge spaced by a gap from the edge of said radiator to provide capacitative coupling across the gap between the respective edges; the outer edge of said annular sheet being dimensioned to be resonantly energisable at said operating frequency via said capacitative coupling.
Claim 3
Dependent Claim
40 words
2, An antenna as claimed in claim 1 wherein the conducting sheet radiator is dimensioned to function as a half-wave resonator at the operating frequency and the annular sheet is of such width as to function as a quarter-wave resonator.
Claim 4
Dependent Claim
37 words
An antenna as claimed in claim 2 wherein the conducting sheet radiator is circular and has a diameter of approximately one-half wavelength at the operating frequency, said annular sheet having a width of approximately one-quarter said wavelength.
Claim 5
Dependent Claim
24 words
A reflector antenna comprising a circular reflector having an antenna as claimed in claim 3 located substantially at its focus to provide a feed.
Claim 6
Dependent Claim
13 words
A reflector antenna as claimed in claim 4 wherein said reflector is parabolic.
References Cited (Backward Citations)
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