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BPFs with oct-resonance and -transmission-zero realized by coupling optimization on open-loop resonator

Author

Listed:
  • Xiao Wang
  • Jun-Ge Liang
  • He Jing
  • Jia-Kang Wu
  • Nam-Young Kim
  • Xiao-Feng Gu

Abstract

This paper presents a series of novel designs for dual-band bandpass filters (BPFs) with excellent in-band and out-band filtering performances. By imbedding the spiral-line resonator into the coupling open-loop structures and adjusting the symmetrical structure, the second-order quad-mode BPFs are designed and then the fourth-order oct-mode dual-band BPFs. The final two designs possess eight resonant modes in the passband and also four/eight transmission zeros in the stopband, achieving a high transition-band selectivity with the roll-off rate over 1000 dB/GHz, broad out-band rejection from 1.5 GHz to 5.3 GHz (lower than 30 dB), and strong isolation between dual bands with the suppression level of 30 dB, operating at 3.2/3.4 GHz and 3.2/3.5 GHz respectively. Measured results agree well with simulations and prove the validity of the asymmetry feeders for multi-transmission-zero characteristics.

Suggested Citation

  • Xiao Wang & Jun-Ge Liang & He Jing & Jia-Kang Wu & Nam-Young Kim & Xiao-Feng Gu, 2022. "BPFs with oct-resonance and -transmission-zero realized by coupling optimization on open-loop resonator," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 36(1), pages 83-100, January.
    • Handle: RePEc:taf:tewaxx:v:36:y:2022:i:1:p:83-100
    DOI: 10.1080/09205071.2021.1957026
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