Integrated Input Circuit for Satellite Converter

This paper describes an integrated input circuit for the receiver converter of the German Telecommunication Satellite, Kopernikus, which operates in two frequency bands for two orthogonally linear polarized signals. The input circuit consists of antenna feed horn, band-pass filter and ortho-mode transducer and has been realized in Integrating Waveguide Technology. This circuit is simple and cheap in mass-production and has shown to provide, in two destinated frequency bands 11.45 - 11.70 GHz and 12.50 - 12.75 GHz, good performance, i.e. crosspolarization isolation better than 30 dB, return loss higher than 15 dB, insertion loss lower than 0.65 dB and width of the radiation Batterns (at -10 dB level) in both orthogonal planes about 140. The parameters are not sensitive over wide temperature range.