A microwave phase-shifter including a coupler in a waveguide form, at least one pair of phase-shifter cells, and a conductive strip positioned between each phase shifter cell and configured with a conductive plane to form a guided space where a wave cannot propagate. An incident wave entering a first...http://www.google.com.au/patents/US6429822?utm_source=gb-gplus-sharePatent US6429822 - Microwave phase-shifter and electronic scanning antenna with such phase-shifters
