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High selectivity tunable filtering power divider based on liquid crystal technology for microwave applications

Author

Listed:
  • Xiang Li
  • Zhenhai Shao
  • Mengkui Shen
  • Zhaosheng He

Abstract

A novel electrically tunable filtering power divider, based on liquid crystal (LC) technology, is designed and experimentally demonstrated in this paper. Using low-cost T-shaped inverted-microstrip structures integrated with two dual-mode open-loop resonators, the tunable power divider possesses bandpass-filtering frequency response. Moreover, transitions between inverted-microstrip and microstrip structures are specifically designed at the I/O ports for the self-packaged. The experimental results indicate that the central frequency can be tuned from 5.75 to 6.25 GHz, i.e. a relative tuning range of 8.3%, the 3-dB bandwidth is 6.8 ± 0.2% over the whole tuning range, and the maximum amplitude and phase imbalance are less than 0.8 dB and 2.5°, respectively. In addition, the proposed filtering power divider has three transmission zeros to improve the frequency selectivity.

Suggested Citation

  • Xiang Li & Zhenhai Shao & Mengkui Shen & Zhaosheng He, 2016. "High selectivity tunable filtering power divider based on liquid crystal technology for microwave applications," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 30(7), pages 825-833, May.
    • Handle: RePEc:taf:tewaxx:v:30:y:2016:i:7:p:825-833
    DOI: 10.1080/09205071.2016.1155500
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