A V-Band Diode-Based Analog Predistortion Linearizer for Traveling Wave Tube Amplifiers

Abstract

This paper presents an analog predistortion (APD) linearizer suitable for V-band traveling wave tube power amplifier. A new “field-circuit combination” design method based on the Schottky barrier diode (SBD) three-dimensional electromagnetic simulation model (3D EM Model) is used. A reflection type APD linearizer consisting of a 90° waveguide 3dB hybrid and two SBDs is developed and tested. The actual measurement results show that within the input power range of- 25$\sim$10dBm, the gain expansion is more than 7. 8dB and the phase expansion is over 28° in the frequency band 59.1$\sim$61.1GHz.