Design and development of Orthomode Transducer for X-band frequency

An orthomode transducer for 9.3GHz to 9.5GHz frequency band has been designed and presented here. The Orthomode Transducers are widely used in dual-polarized systems such as radar antennas, radiometers, and communications links. Wherever there are two polarizations of radio signals (Horizontal and Vertical), the transmitted and received radio signal to and from the antenna are said to be orthogonal. This means that the modulation planes of the two radio signal waves are at 90 degrees to each other. The OMT designed here has been able to achieve isolation better than 40 dB and VSWR<;1.42. The commercial software HFSS is used to design the whole structure.