This paper presents the design and performance of a compact-size branching orthomode transducer (OM1) 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.
An 18GHz-band MMIC linearizer using a parallel diode with a bias feed resistance and a parallel capacitor has been proposed. This linearizer has weak positive gain deviation and its gain deviation can be controlled without changing phase deviation.band power amplifier, an improvement of IMD3 of 20 dB has been achieved.By applying this linearizer to an 18GHz-
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