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

Mingye Fu, Qianyin Xiang, Quanyuan Feng, Zongliang Zheng, Zhixiong Di and Ting Peng

Journal of Electromagnetic Waves and Applications, 2019, vol. 33, issue 6, 759-770

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.

Date: 2019
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DOI: 10.1080/09205071.2019.1576064

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