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- W2083459061 abstract "The radar cross section (RCS) of a circular waveguide terminated by a perfect electric conductor is calculated by the geometrical theory of diffraction (GTD) for the rim diffraction and by a physical optics approximation for the interior irradiation. The interior irradiation is generally more than 10 dB higher than the rim diffraction for <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>a/lambda geq 1</tex> ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>a</tex> is the waveguide radius, <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>lambda</tex> is the free-space wavelength). At low frequencies ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>a/lambda sim 1</tex> ), the interior irradiation can be significantly reduced over a broad range of incident angle if the interior waveguide wall is coated with a thin layer (1 percent of the radius) of lossy magnetic material. Our theoretical prediction is confirmed by measurements. At higher frequencies ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>a/lambda sim 3</tex> ), a thin layer of coating is effective for the case of near axial incidence, provided that a good transition of the <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>TE_{11}</tex> mode near the waveguide opening to the <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>HE_{11}</tex> mode inside the waveguide is made. A thicker layer of coating is required for the RCS reduction over wider incident angle." @default.
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- W2083459061 date "1987-04-01" @default.
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- W2083459061 title "RCS of a coated circular waveguide terminated by a perfect conductor" @default.
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- W2083459061 doi "https://doi.org/10.1109/tap.1987.1144114" @default.
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