In this paper, a compact TE21 mode coupler is designed for tracking Low Earth Orbit Satellites. The tracking feed has to be employed to provide the error signal to servo systems feedback mechanism. The design incorporates the circular and eight rectangular waveguides with 13 asymmetric circular apertures on a single rectangular arm. The arrangement is small in size provides good return loss and VSWR The designed configuration presents return loss is better than -30dB and VSWR around 1.06 for frequency range of 25.5-27GHz. The designed model is simulated and analysed using CST

In this paper, Development of dual band feed operating in C and Ku bands to obtain high illumination and spill over efficiencies and high cross polarization discrimination, maximum gain and low side lobes for shaped Cassegrain Antenna of larger diameter is presented. The Design envisages a common aperture C and Ku band corrugated horn. Corrugated horn of suitable dimensions for the propagation of hybrid modes in both C and Ku bands having equal beam widths in principal planes (E&H) and pattern of rotationally symmetric radiation will be illuminating the shaped sub reflector in modified Cassegrain geometry. The corrugated horn is designed to operate over a frequency range of C (3.4-4.8 GHz) and Ku (10.7-12.75 GHz) bands. CHAMP is used to simulate and analyze the designed model.