Journal of Xidian University

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Novel design method for the ultra-wideband digital phase shifter

ZHANG Honggang;LIU Luokun;JIAN Chunxiao;ZHANG Xianfeng;ZHENG Xiaoyu   

  1. (School of Information System Engineering, Information Engineering Univ., Zhengzhou 450001, China)
  • Received:2015-07-22 Online:2016-12-20 Published:2017-01-19

Abstract:

Based on the vector sum theory, using the hybrid microwave integrated circuits (HMIC) technology, a novel method of designing Ultra-wideband digital phase shifter is proposed. By adjusting the magnitude of two orthogonal signals to obtain different amplitude and phase vectors in the first quadrant, this method adopts the structure of three-level cascade to realize a 360° phase shift of the input signal. Using this method, a UHF band ultra-wideband six bit digital phase shifter is designed and fabricated. In the working frequency band of the 57% relative bandwidth, the phase shifter has the RMS phase error of less than 3.8°, and amplitude imbalance of less than 3.0dB. When applied in the phased arrays antenna, which has a wide working band and narrow instantaneous signal bandwidth, the amplitude imbalance is decreased to less than 2.5dB and the RMS phase error is reduced to less than 3.0°, by dividing the frequency band for piecewise correction. It meets the need of a certain type of phased array antenna.

Key words: vector sum, hybrid microwave integrated circuits, ultra-wideband, digital phase shifter, root mean square phase error, phased array antenna