Advanced Circularly Polarized Transmitter using Active Phased Array Antenna

This paper proposes a Ka-band land-mobile satellite communication technology using a Circularly Polarized Active Phased-Array Antenna CPAPA. The CPAPA is an array with 60 elements arranged in a rectangular grid, driven by eight MMICs, each with eight RF channels. The technology provides a modular and scalable Ka-band with a large steering angle by dynamically controlling phase and amplitude throughout the antenna using three metal layers on a low-cost PCB. The CPAPA exhibits an exponential taper, effectively reducing SLL from 14 to 26 dB. The system generates two RHCP beams at -37° and +27° scan angles, showcasing its potential for advanced beamforming applications and advancing phased-array antenna technology.