paper 150415021930

Published: 2015-07-09

Research on Dual Bandpass of Wide Stopband Filter with Tunable Center Frequency

Han-Lin Duan,

Han-Lin Duan

Harbin Engineering University, China

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Tao Jiang,

Tao Jiang

Harbin Engineering University, China

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Zhao-Qing Sun,

Zhao-Qing Sun

Harbin Engineering University, China

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Yong-Sheng Zhao

Harbin Engineering University, China

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1627-1631

Abstract

A dual passband of wide stopband varactor tuned filter using stepped impedance resonators (SIRs) is proposed in this paper. A varactor is loaded on the middle of the E- shaped resonators, through changing the value of the bias voltage across the varactor, the center frequency of the second passband can be tuned from 1.56 GHz to 2.25 GHz, however, the center frequency of the first passband is fixed and maintained at 1.02 GHz. In fact, it is fixed during the whole process. The relative bandwidth of the first passband is 14.7%, the return loss of is 19 dB and the insertion loss is 0.2 dB. The second passband can tuning from 1.56 GHz to 2.25 GHz with the tuning range of 36.2%. The relative bandwidth almost keep unchanged. The return loss change from 16 dB to 30 dB and the insertion loss change from 0.2 dB to 0.8 dB. This filter proposed in this paper has a great characteristic of harmonic suppression, −20 dB up to 3.5 GHz. There are two advantages of the optimization process. The first is that a filter network is added in the input and output coupling line to depress stopband. The second is that spurlines are added at the input and output coupling line which can add zero between the two passbands, which improved the performance for filter. It is good to improve the selectivity of the filter. The filter proposed in this paper can achieve a compact size, lower insertion loss and wider rang harmonic suppression. Simulations show that the filter proposed is valid and has a good performance.

Citation

Han-Lin Duan, Tao Jiang, Zhao-Qing Sun, and Yong-Sheng Zhao, "Research on Dual Bandpass of Wide Stopband Filter with Tunable Center Frequency," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1627-1631

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