Design of compact-size high isolation branching OMT by the mode-matching technique

This paper presents the design and performance of a compact-size branching orthomode transducer (OMT) with high isolation characteristics. The design is performed using the mode-matching applied to the circular-to-rectangular waveguide Tjunctions. The design example demonstrates the high efficiency of this design method for X-band branching OMT without septa, and realizes excellent performance. The theory is verified by a good agreement with measurements.