Design Method OF RF Frontend Based on Interferometer Direction Finding Technology

This paper presents a RF front-end design idea based on interferometer direction finding technology, using planar spiral antenna, bandwidth spliced frequency conversion circuit and broadband AD circuit to realize the real-time reception of 12GHz frequency bandwidth,and improves the interception probability, direction finding accuracy and receiving sensitivity of conventional direction finding system. In this paper, four 3GHz bandwidth splicing are used to realize the instantaneous direction finding of 12GHz bandwidth, and skillfully combine power division network and millimeter wave mixing circuit to achieve ultra-low spurious and high harmonic suppression transmission of broadband signals. The scheme can achieve azimuth coverage of airspace is 45°, pitch-15° ~+70°, Real-time receiving 12GHz wide bandwidth signal. The direction finding accuracy can be better than 1°.