A compact full waveguide band turnstile junction orthomode transducer

Abstract

This paper describes the development, construction, and measurement of a full waveguide band (8-12 GHz) orthomode transducer (OMT). The design uses a turnstile junction at the input, two 90° H-plane bends in each of four waveguide arms, and two E-plane Y-junctions. The outputs are in WR90 waveguides. Measured return loss is better than 19 dB and cross polarization lower than -50 dB in the 7.8-12.2 GHz range. Three large aluminum blocks form the main body of the OMT. The device has a diameter of 8.0", height of 2.7", and weighs 2.5 lbs. © 2011 IEEE.