A K/C/S bands satellite antenna with frequency selective surface

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Abstract
AK(30/20 CHz)/C(6/4 GHz)/S(2.6/2.5 GHz) bands offset satellite antenna with anS/Cbands feed horn and a low pass frequency selective surface (FSS) covering only part of a whole aperture angle, is designed, reproduced, its characteristic as an onboard antenna is confirmed and a design method and characteristic evaluation method for this type of antenna are established. In this antenna, three different frequency bands with different optimum aperture diameters share one reflector. the optimum aperture diameters peculiar for respective frequency bands (1.8 m forS, 1 m forC,Kbands) are realized equivalently by choosing the diameter of theS/Cbands feed horn and the size of FSS. the decrease in service area edge gain due to frequency bands sharing is about 1 dB, a satisfactory result compared to the case in which respective frequency band antennas are on board. the efficient analysis method assuming equivalent currents on the plane containing the FSS is derived to evaluate scattering from the small FSS. This method permits an antenna design with FSS size as a parameter; this was not considered before. the design and analysis of the antenna are confirmed by measurements.

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