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| Abstract |
A basic theory of a longitudinal slot in a rectangular waveguide with a lossy flange is presented. The surface impedance concept and equivalence principle are used to formulate the problem. The effect...s of a lossy ground surface on the characteristics of an aperture antenna are discussed. The numerical results agree very well with measured results of an X-band slot antenna, which has a conducting flange covered with an absorbing material. The results show the validity of the application of the surface impedance concept to the problem of aperture antennas with lossy ground surfaces.show more
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