Compact Microstrip Dual-Wideband Bandpass Filter Using a Novel Multi-Mode Resonator
[1]
Jun Li, Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing 210094, China; Huawei Technologies Co., Ltd., Shanghai 200121, China.
[2]
Shan Shan Huang, Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing 210094, China; Spreadtrum Communications Inc., Shanghai 201203, China.
[3]
Jian Zhong Zhao, Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing 210094, China.
A high selectivity dual-wideband bandpass filter (BPF) utilizing a novel multi-mode resonator (MMR) is presented in this paper. Due to the symmetric structure of the proposed MMR, classical even- and odd-mode analysis method is applied to investigate its resonant characteristics. The center frequencies and bandwidths of the two passbands can be controlled by tuning the dimension parameters of the resonator. With the help of multi-path propagation between the meandered open stubs and source-load coupling feed scheme, four transmission zeros are generated close to the passbands to improve skirt selectivity and achieve high band-to-band isolation level. Moreover, the overall circuit size only occupies 0.122 λg × 0.079 λg which is very compact. A dual-wideband BPF prototype centered at 1.96 GHz and 4.79 GHz with –3 dB fractional bandwidths (FBWs) of 25.1% and 24.4% is designed, fabricated and measured. The measured results are in good agreement with the simulated ones.
Bandpass Filter (BPF), Dual-Wideband, Microstrip, Multi-Mode Resonator (MMR)
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