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This paper presents development of a new planar spiral feed for a satellite boresight reference antenna, operating at two widely separated frequency bands (2200-2300 MHz and 8000-8400 MHz). A stepped ground plane cavity with different quarter wavelength distances is proposed to provide unidirectional patterns at these frequency bands. A back lobe suppression of around 12 dB in 2 GHz band and better...
A stubloaded reflectarray antenna, which combines the features of conventional parabolic reflector and planar microstrip patch array, is presented. Equiphase distribution at the aperture of the reflectarray is realized by adding stubs of appropriate lengths at each element. A reflectarray of 10??10 elements designed at 10 GHz exhibiting a gain of 22.5 dB and first side lobe level of -12.4 dB is presented...
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