Development of Linearizer for Millimeter-Wave Solid State Power Amplifier

A linearizer for 10 W Solid State Power Amplifier(SSPA) in Ka-band is developed.The millimeter-wave(MMW) predistortion linearizer,which is composed of a Schottky diode and a parallel capacitor,has gain expansion and phase shift characteristics,and its characteristics can be controlled.By applying this linearizer to a 30 GHz-power amplifier with 10 W output power,and using a two-tone prompting signal with 5 MHz spacing,the improvement of IMD3 is 15 dBc.