Compact tunable bandpass filter with wide tuning range using ring resonator and short‐ended coupled lines

2015 ◽  
Vol 51 (7) ◽  
pp. 568-570 ◽  
Author(s):  
H. Zhu ◽  
A. Abbosh
IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 82286-82293
Author(s):  
Xiaoxiao Chen ◽  
Yongle Wu ◽  
Yuhao Yang ◽  
Weimin Wang

2013 ◽  
Vol 49 (16) ◽  
pp. 1007-1008 ◽  
Author(s):  
B.L. Zhao ◽  
Z.T. He ◽  
X.B. Wei ◽  
Y. Shi

2013 ◽  
Vol 10 (18) ◽  
pp. 20130561-20130561 ◽  
Author(s):  
Baolin Zhao ◽  
Guanghui Gao ◽  
Xubo Wei ◽  
Peng Gao ◽  
Yu Shi

Author(s):  
Norfishah Ab Wahab ◽  
M. N. Md Tan ◽  
M. N. Hushim

<p class="Pa41">This paper presents a single mode pseudo-elliptic bandpass resonator based on closed-loop ring topology. The resonator is built from six quarter wavelength transmission lines to form a square closed-loop ring structure. This structure creates transmission zeros at the lower and upper sidebands so that high selectivity bandpass filter response is achieved. The advantage of this topology is that the design is less complex since no perturbation is needed on the ring lines for creation of transmission zeros. Higher-order filters can be constructed by introducing quarter-wavelength coupled-lines, coupled at both input and output of the closed-loop ring resonator. For proof of concept, the filters are designed at 10 GHz up to 3<sup>rd</sup> order, simulated using full-wave electromagnetic simulator on microstrip substrate, <em>FR-4</em> with characteristics given as <em>Ԑr </em>= 4.70, <em>h </em>= 1.499 mm and <em>tan δ </em>= 0.012.  The filters are simulated and responses are found to be agreeable with the proposed idea.</p>


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