Dual-Band Bandpass Filter with Wide Upper Stopband Using Novel Stepped Impedance Stub-Loaded Quad-Mode Resonator

被引:2
|
作者
Lin, Lei [1 ]
Zhang, Zhen-Long [1 ]
Sun, Shou-Jia [1 ]
Liang, Chang-Hong [1 ]
机构
[1] Xidian Univ, Natl Key Lab Antennas & Microwave Technol, Xian 710071, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.2528/PIERL14120601
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents a wide upper stopband dual-band bandpass filter (BPF) with controllable passband frequencies and bandwidths as well as a high out-of-band rejection level. The proposed filter is realized by utilizing a novel stepped impedance stub-loaded quad-mode resonator. All the four-mode equivalent circuits of the resonator are quarter-wavelength stepped impedance resonators (SIRs), and their fundamental resonance frequencies are used to form the passbands, so the designed filter has a compact circuit size. By controlling the impedance and length ratios of the stubs of the resonator, wide upper stopband performance is obtained. Hook-shape feed-lines and source-load coupling are applied to provide appropriate external coupling and generate three extra transmission zeros, which greatly improve the selectivity of the proposed filter. An experimental filter operating at 1.5 and 3.5 GHz is designed, fabricated, and measured for validation. The measured results have good agreement with the simulated ones.
引用
收藏
页码:61 / 66
页数:6
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