新型三阶SIR高阻带抑制双通带滤波器

doi:10.3969/j.issn.1007-2861.2015.01.019

Journal of Shanghai University（Natural Science Edition） ›› 2017, Vol. 23 ›› Issue (1): 147-154.doi: 10.3969/j.issn.1007-2861.2015.01.019

A novel tri-section SIR dual-band filter with high stopband rejection

JIANG Yifei^1,2, MENG Lingqin^1,2, YANG Guangli¹

1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China;
2. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China

Received:2015-02-03 Online:2017-02-28 Published:2017-02-28

Abstract

Abstract:

A dual-band filter with high stopband rejection is designed using a tri-section signal to interference ratio (SIR) resonator. The center frequencies and first spurious frequencies of resonators can be controlled independently to design aspecific dual-band filter. The tri-section coupling structure is aimed at transmission zeros and high stopbands rejection. To get a high external quality factor, an inter-digital finger coupling structure is introduced. The filter has dual passband center frequencies of 1.57 GHz (GPS) and 2.5 GHz (4G), with 3 dB fractional bandwidths of 4.0% and 2.4%, respectively. Measured results well agree with simulations.

Key words: high stopband rejection , transmission zero, tri-section coupling structure , tri-section signal to interference ratio (SIR) resonator

JIANG Yifei1,2, MENG Lingqin1,2, YANG Guangli1. A novel tri-section SIR dual-band filter with high stopband rejection[J]. Journal of Shanghai University（Natural Science Edition）, 2017, 23(1): 147-154.

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A novel tri-section SIR dual-band filter with high stopband rejection

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