Compact Stripline Dual-Band Bandpass Filters With Controllable Frequency Ratio and High Selectivity Based on Self-Coupled Resonator

2020 ◽  
Vol 68 (1) ◽  
pp. 102-110 ◽  
Author(s):  
Xuedao Wang ◽  
Jianpeng Wang ◽  
Lei Zhu ◽  
Wai-Wa Choi ◽  
Wen Wu
Keyword(s):  
Frequency Ratio ◽  
High Selectivity ◽  
Bandpass Filters ◽  
Dual Band ◽  
Coupled Resonator

scholarly journals High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Wei-Qiang Pan ◽  
Xiao-Lan Zhao ◽  
Yao Zhang ◽  
Jin-Xu Xu
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Dual Band ◽  
Transmission Zeros ◽  
Resonant Modes ◽  
Novel Method ◽  
Good Agreement ◽  
Tunable Bandpass Filter

This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted mode to avoid the interference. Varactors are utilized to realize tunable responses. The bandwidth of the two bands can be controlled individually. Transmission zeros are generated near the passband edges, resulting in high selectivity. For demonstration, a tunable bandpass filter is implemented. Good agreement between the prediction and measurement validates the proposed method.

Dual-/tri-band bandpass filters with fully independent and controllable passband based on multipath-embedded resonators

2020 ◽  
Vol 12 (10) ◽  
pp. 1012-1019
Author(s):  
Yang Xiong ◽  
Wei Zhang ◽  
Yue-Peng Zhong ◽  
Li-Tian Wang
Keyword(s):  
Numerical Calculation ◽  
Calculation Method ◽  
High Selectivity ◽  
Bandpass Filters ◽  
Dual Band ◽  
Compact Size ◽  
Symmetric Plane ◽  
Via Hole ◽  
Numerical Calculation Method

AbstractIn this paper, dual-band and tri-band bandpass filters (BPFs) with fully independent and controllable passbands based on multipath-embedded resonators are presented. The dual-band BPF consists of two double open-ended stub-loaded terminal-shorted resonators (DOESL-TSRs) with a common via-hole connected along the symmetric plane of the filter. Based on DOESL-TSRs, a triple open-ended stub-loaded terminal-shorted resonator (TOESL-TSR) is proposed in the design of tri-band BPFs. The resonant characteristics of DOESL-TSR/TOESL-TSR are analyzed by the numerical calculation method. The measured results of the dual-band BPF show that the center frequencies (CFs) are located at 2.595 and 5.75 GHz, respectively, with 3 dB fraction bandwidth (FBWs) of 15 and 12.8%. The measured CFs of the tri-band BPF are located at 2.545, 3.775, and 5.95 GHz, respectively, with 3 dB FBWs of 9.8, 9.3, and 5.5%. Both of the filters exhibit the merits of fully independent and controllable passbands, high selectivity, and compact size.

Dual-Band Microstrip Balun With Flexible Frequency Ratio and High Selectivity

2017 ◽  
Vol 27 (11) ◽  
pp. 962-964 ◽  
Author(s):  
Feng Huang ◽  
Jianpeng Wang ◽  
Lei Zhu ◽  
Quangang Chen ◽  
Wen Wu
Keyword(s):  
Frequency Ratio ◽  
High Selectivity ◽  
Dual Band
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