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Monolithic integrated pseudocombline bandpass filter with pre-designed second to fundamental harmonic ratio

Author

Listed:
  • Mingye Fu
  • Qianyin Xiang
  • Quanyuan Feng
  • Zongliang Zheng
  • Zhixiong Di
  • Ting Peng

Abstract

An integrated 3rd-order pseudocombline bandpass filter with pre-designed second to fundamental harmonic ratio is designed based on 0.25 μm GaAs (Gallium Arsenide) process. λ0/4 microstrip loaded with capacitor is used as the resonator. The second to fundamental harmonic frequency ratio of the resonator is investigated, and the ratio can be controlled by the resonator's capacitor. The coupling coefficients and external quality factor are designed based on coupling matrix. This filter was fabricated with die size of 1050 μm×1556 μm. The measurement shows that the ratio of second to fundamental harmonic is 10.7, the stopband rejection keeps higher than 40 dB from 5.15 to 22.2 GHz, and a transmission zero is generated at 5.7 GHz due to the magnetic cross coupling between the first and third resonator. The −1 dB bandwidth is from 3.05 to 4 GHz, and the minimum insertion loss is 1.5 dB.

Suggested Citation

  • Mingye Fu & Qianyin Xiang & Quanyuan Feng & Zongliang Zheng & Zhixiong Di & Ting Peng, 2019. "Monolithic integrated pseudocombline bandpass filter with pre-designed second to fundamental harmonic ratio," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 33(6), pages 759-770, April.
    • Handle: RePEc:taf:tewaxx:v:33:y:2019:i:6:p:759-770
    DOI: 10.1080/09205071.2019.1576064
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