Four-Way Quadrature Feed for UHF Circular Polarization

This compact sequential phase feed network is designed to provide circular polarization for CubeSat UHF communications. The system generates a precise 0°, 90°, 180°, 270° phase sequence to drive four orthogonal whip antennas. Occupying a footprint of only 33×33 mm, the design achieves high amplitude and phase balance. This article covers the RF architecture, simulation, and the measured…