Journal of Xidian University

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Design and analysis of multi-tuned impedance matching and broadband antennas

WANG Le;ZHAO Zhipeng;LI Ya'nan;LIU Jinhai;YIN Yingzeng;LI Hui   

  1. (Science and Technology on Antennas and Microwave Lab., Xidian Univ., Xi'an 710071, China)
  • Received:2018-03-14 Online:2018-10-20 Published:2018-09-25
  • Contact: yzyin@mail.xidian.edu.cn E-mail:10.3969/j.issn.1001-2400.2018.05.012

Abstract:

In order to broaden the impedance bandwidth of an antenna, the multi-tuned impedance matching technology can be utilized. An antenna can be equivalent to a single-port microwave resonant circuit according to the theory of impedance matching. In a practical antenna design, multi-tuned impedance matching can be performed on either the antenna feed network or the radiator. Two examples are given to validate the feasibility and effectiveness of the multi-tuned impedance matching technology. Experimental results show that a folded monopole achieves double-tuned impedance matching by introducing a loop, thus enhancing its fractional impedance bandwidth from 9.70% to 46.80%. In addition, a sleeve antenna obtains a triple-tuned impedance matching with the presence of four metal pillars, thus improving its band of operation from 55.14% to 82.11%.

Key words: impedance matching equation, multi-tuned impedance matching, improve the impedance bandwidth, broadbandantenna