A Differential Structure-Based 4-Channel Ka-Band RF Beamforming Transmitter Chipset for SATCOM

Beamforming technology for next-generation space applications has requirements such as multi-function, high integration, high performance, and high reliability of the system. In this study, the system was designed based on a differential structure to minimize performance variations and degradation owing to the interconnection of the semiconductor chipset and package. In addition, to compensate for the insertion loss characteristics due to the frequency-dependent loss characteristics of the passive elements, two loss compensation amplifiers with equalization functions were placed to achieve flat in-band transmission characteristics. The proposed chipset provides a phase-adjustment range of 360° and an amplitude-adjustment range of 31.75 dB, providing precise beam steering and shaping.