Abstract
A compact dual-band ortho-mode transducer is presented in this paper. Two orthogonally polarized signals received by a square waveguide are separated into two orthogonal channels at 10.7{ 12.75GHz and 10.3{11.9GHz, respectively, while a single-polarized signal is transmitted at 14{14.5GHz. To obtain good isolation between the transmit (Tx) and receive (Rx) channels of the same polarization with a compact size, an irregularly shaped diaphragm is proposed as a compact dual-function resonator, which has one transmission zero at the Tx band and one pole at the Rx band. The designed OMT is fabricated and measured in a back-to-back conflguration. Measured results agree very well with simulated ones and the isolation improvement by the diaphragm is about 15dB, which verifles our design.
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