Miniaturised dual‐band filter with high selectivity using split ring scheme

2015 ◽  
Vol 51 (7) ◽  
pp. 570-572 ◽  
Author(s):  
Guoan Wu ◽  
Lingling Yang ◽  
Qinfen Xu
Keyword(s):  
High Selectivity ◽  
Dual Band ◽  
Split Ring ◽  
Band Filter

Study of dual-band inline mixed coupled BPF design and two transmission zero pairs controlling mechanism

2017 ◽  
Vol 9 (7) ◽  
pp. 1447-1452
Author(s):  
Di Lu ◽  
Teng-Fei Yan ◽  
Xiao-Hong Tang
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Control Mechanism ◽  
Synthesis Method ◽  
Optimization Procedure ◽  
Dual Band ◽  
Transmission Zero ◽  
Controlling Mechanism ◽  
Band Filter ◽  
And Control

In this letter, a passive high-selectivity dual-band filter with two controllable transmission zero (TZ) pairs is proposed, while synthesis method and control mechanism of the two TZ pairs are investigated. Specifically, by employing the magnetic/electric mixed coupling (MEMC), source–load coupling (S–L coupling) and stepped-impedance resonators, a dual-band bandpass filter with two pairs of controllable TZs is constructed. Two controllable TZ pairs can be independently adjusted by re-modifying the associated coupling structures. To validate the synthesizability and controllability of the TZ pairs, mathematical synthesis, and EM simulations are carried out. Two demonstrative filters with identical passband performance and different central TZ distributions for GSM (0.9/1.8 GHz) are designed and measured. The analysis and experimental results show that the synthesis-controllable TZ pair (fz2, fz3) introduced by MEMC can be synthesized and controlled using inline mixed coupling synthesis, and the optimization-controllable TZ pair (fz1, fz4) because of S–L coupling is controlled by S–L coupling strength optimization procedure.

A High Selectivity Dual-Band Filter Using Ring-Like Sir with Embedded Coupled Open Stubs Resonators

2011 ◽  
Vol 25 (14-15) ◽  
pp. 2011-2021 ◽  
Author(s):  
W.-Y. Chen ◽  
M.-H. Weng ◽  
S.-J. Chang ◽  
H. Kuan
Keyword(s):  
High Selectivity ◽  
Dual Band ◽  
Band Filter
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