Design Of Wave-guide Slot Phased Array Antenna

In this paper, a method for the design of a one-dimensional wave-guide slot phased array antenna is studied. And the design for the element of the phased array is the narrow wall wave-guide slot array is mainly discussed. On the base of the amplitude and phase distribution derivated from the synthesis procedure, the radiation pattern is synthesized and the feed system for the phased array antenna is designed. Finally, the beam broadening and scanning problems for the phased array antenna are studied.The one-dimensional phased array antenna discussed in this paper needs to radiate a narrow beamwidth and low sidelobe pattern on the horizontal, a sum and difference beam on the vertical. The amplitude and phase of low side-lobe pattern on the horizontal are synthesized using the Taylor distribution. The radition front of the phased array antenna is designed by combining the classic calculation theory of wave-guide slot array and the electromagnetic computing software. The antenna is fabricated and measured and a good performance has obtained by measured.The feed system of the phased array antenna is designed on the base of the amplitude and phase distribution of the sum beam on the vertical derivated using the Taylor synthesis. And the design procedure of the feed system is detailedly disscused. The waveguid power splitter is adopted for the feed system. Two multiport narrow wall wave-guide slot traveling-wave power splitters are connected by a magic-tee to composing the waveguide power splitter. The measured results meet the design requirements.On this basis, the problem for the beam broadening and scanning of the phased array antenna is studied. The phases of the phased array antenna are optimized by using genetic algorithm (GA) for the aim of beam broadening and the broadened beam is sanned.