Dual-mode square ring resonators for design of millimeter-wave ultra-wideband bandpass filter

2008 ◽  
Vol 50 (4) ◽  
pp. 879-883 ◽  
Author(s):  
Peng Cai ◽  
Zhewang Ma ◽  
Xuehui Guan ◽  
Yong Zhang ◽  
Bin Chen ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Bandpass Filter ◽  
Ultra Wideband ◽  
Ring Resonators ◽  
Dual Mode

Design and Analysis of Dual-Mode Double-Ring Resonator for Dual-Band Bandpass Filter Applications

2013 ◽  
Vol 321-324 ◽  
pp. 376-382
Author(s):  
Ming Wei Hsu ◽  
Man Long Her ◽  
Wen Ko ◽  
Yu Lin Wang
Keyword(s):  
Bandpass Filter ◽  
Ring Resonator ◽  
Relative Dielectric Constant ◽  
Capacitive Coupling ◽  
Ring Resonators ◽  
Dual Band ◽  
Center Frequency ◽  
Dual Mode ◽  
Double Ring ◽  
Single Ring

In this paper, two types of miniaturized dual-mode bandpass filters (BPF), a single-ring (SR) resonator, and a double-ring (DR) resonator are developed. By applying the capacitive-coupling technique to a dual-mode ring filter, a technique is proposed to miniaturize the dual-mode double-ring filter. An adjustable dual-band bandpass filter is achieved by developing a ring resonator where the two modes are capacitively coupled. Control of the filter center frequency is determined by the diameter of the ring and by the rings annular width. Filter coupling amount can also be adjusted by disturbance (perturbation) of an open stub attached to the annular disc. Proposed filters explore both single- and double-ring architectures. A single-ring resonator acting as a dual bandpass filter to allow 3.8 GHz and 7.8 GHz single is developed. A double-ring resonator to allow 2.05 GHz and 3.9 GHz signals is also developed. The ring resonators are fabricated on RO-4003 substrate, with relative dielectric constant of 3.38, thickness of 0.8 mm, and dielectric loss tangent of 0.0025. Results indicate the filters can be applied in the communications field.

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