新型宽阻带双通带滤波器设计

doi:10.3969/j.issn.1001-2400.2015.06.010

Abstract

Abstract:

In traditional design of the dual-band bandpass filter (BPF), two or more resonators need to be utilized, which leads to a relatively large circuit size. For miniaturization, a novel stub-loaded square loop quad-mode resonator is proposed in this paper. Due to the symmetry of the structure, the even-odd-mode method is applied twice to analyze its resonance characteristics. All the four mode equivalent circuits are quarter-wavelength resonators, so the resonator has a compact size and the first harmonic is three times the fundamental one. The resonant frequency of each mode can be tuned freely by changing the corresponding physical dimensions, and the passband frequencies and bandwidths of the designed dual-band filter using the proposed resonator are independently controllable. To improve the selectivity and achieve a wide upper stopband, quarter wavelength hook-shape feedlines are designed to provide appropriate external coupling. Two new transmission zeros are generated by the feedlines. Finally, a microstrip dual-band bandpass filter (BPF) centering at 15 and 24GHz with a 3dB fractional bandwidth (FBW) of 107％ and 96％ is designed and fabricated. The measured and simulated results which are in good agreement are presented.

Key words: quad-mode resonator, bandpass filter, transmission zero, wide upper stopband

CLC Number:

TN713+.5

LIN Lei;WU Bian;SU Tao;LIANG Changhong. Novel dual-band bandpass filter with wide upper stopband performance[J].J4, 2015, 42(6): 56-60.

References

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[1]	LIN Lei;SUN Shoujia;WU Bian;LIANG Changhong. Design of a novel multiple-mode tri-band bandpass filter [J]. J4, 2015, 42(3): 38-42+96.
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[3]	LI Tong;ZHAI Huiqing;LIANG Changhong;LI Qi. Study of coupling properties of the square split ring resonator [J]. J4, 2013, 40(1): 26-29+35.
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[5]	CHEN Jianzhong;LIANG Changhong;CHEN Jia;LI Qi. Parameter extraction method for microwave filters based on the curve fitting technique [J]. J4, 2011, 38(4): 101-105+123.
[6]	QIN Pei-yuan;SHI Xiao-lin;LIANG Chang-hong;WU Bian. Novel X-band dual-mode bandpass filter based on the substrate integrated waveguide [J]. J4, 2009, 36(5): 831-834.
[7]	GONG Jian-qiang;CHU Qing-xin. Novel SCRLH transmission line structure and its application to UWB filter design [J]. J4, 2009, 36(5): 841-845.
[8]	ZHU Yong-zhong1,2;XIE Yong-jun1;XIE Wen-xuan3;LI Ya-feng1. Band-edge optimization design of the quasi-elliptic filter [J]. J4, 2009, 36(3): 448-467.
[9]	ZHAO Jian-zhong;YANG Jin-ping;YANG Guo;WU Wen. Design of a compact narrow band-pass filter with harmonics suppression [J]. J4, 2009, 36(3): 568-572.
[10]	WU Bian;LIANG Chang-hong;CHEN Liang;LI Gang. Composite right／left-handed transmission line based on split-ring resonator DGS [J]. J4, 2008, 35(2): 254-257.

Novel dual-band bandpass filter with wide upper stopband performance

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