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A design of dual-band cavity-backed slot antenna is presented for GPS and S-band radar applications. In the design, a very thin cavity (0.017 λ0 in thickness at 1.575 GHz) is used to achieve unidirectional radiation. The dual-band responses of the antenna are excited by the slot resonance at 1.575 GHz and waveguide transition effect at 2.4 GHz. Even with very small cavity thickness, reasonable impedance...
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