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This paper reports design and development of an innovative compact Stepped Truncated-Circular Waveguide Branching Ortho-Mode Transducer (STCWB-OMT) operating at 4.5{4.8GHz for horizontal and vertical polarizations. STCWB-OMT is derived by introducing branch waveguide via coupling slot on a stepped truncated- circular waveguide. This conflguration possesses inbuilt rectangular- to-circular transition; therefore it does not require any additional square-to-circular transition to combine it with horn antenna. The challenge in the design incorporated is to obtain a mechanically compact design with low mass while compliant with the specifled electrical performances; since this device is developed for space-borne application. Achieved return losses at both direct and coupled ports are > 17dB, insertion losses 40dB with the OMT length = 1:98‚ at center frequency and weight = 250gm The agreement between measured and computed results provides a validation of the proposed OMT conflguration.

COMPACT AND HIGH PERFORMANCE STEPPED TRUNCATED-CIRCULAR WAVEGUIDE BRANCHING ORTHO-MODE TRANSDUCER (STCWB-OMT)