Journal of Xidian University

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Analysis and design of high performance splash-plate feed antenna

LIU Minghui;XIANG Zheng;XU Tongtong;REN Peng;CHEN Yun   

  1. (School of Telecommunications Engineering, Xidian Univ., Xi'an 710071, China)
  • Received:2017-05-31 Online:2018-02-20 Published:2018-03-23

Abstract:

In order to improve the transmission distance and anti-interference ability of the microwave relay system and point-to-point communication system, we design a high performance splash-plate feed antenna with the diameter of 0.3m and the center frequency of 15GHz. By shaping the dielectric supporting mirror and sub-reflector of the splash-plate feed, we realize the far field radiation pattern equalization and roll-off of the E plane and H plane within and outside the scope of the main reflector irradiation angle, respectively. Then, the impedance matching of the antenna is realized by optimizing the media matching plug. Finally, the design model is processed and tested, with the test results showing that the gain at the antenna center frequency point is 32.43dBi, that the maximum sidelobe level can be suppressed to 21.89dB and that the front to back ratio in the E plane and H plane is significantly improved to be 59.57dB. The good agreement of measured data with simulation results verifies the proposed design.

Key words: reflector, splash-plate feed, shaped dielectric, low sidelobe