Abstract: In order to solve the problems of endfire, miniaturization and broadband of the micro-Doppler effective radar, a compact broadband endfire array antenna is proposed.The four T-slotted antenna elements are symmetrically placed on the back of the substrate, and the feeding network is located on the front of the substrate, thus forming a coupling feed, which has same amplitude and the distribution of phase in the clockwise direction is 90°, 270°, 0°, 180°.After processing and measurement, the measured results are basically consistent with the simulated results, and the operating frequency band is 5.72~6.71 GHz, which has the absolute bandwidth of 0.99 GHz and satisfies the requirement of wideband characteristic.The antenna adopts an easy-to-integrate miniaturized planar design, and has broadband characteristic, good endfire performance, low processing cost, which can meet the practical application requirements of the micro-Doppler effective radar.

Key words: slot array antenna, compact plane, broadband, endfire, micro-Doppler effective radar