scholarly journals Harmonic Suppression Improvement of Microstrip Open Loop Ring Resonator Bandpass Filter

2011 ◽  
Vol 8 ◽  
pp. 19-24 ◽  
Author(s):  
Nopparat Thammawongsa ◽  
Ravee Phromloungsri ◽  
Krissanapong Somsuk ◽  
Pichai Arunvipas
Keyword(s):  
Bandpass Filter ◽  
Ring Resonator ◽  
Open Loop ◽  
Harmonic Suppression ◽  
Loop Ring

scholarly journals Closed-loop ring resonator topology for bandpass filter applications

2020 ◽  
Vol 17 (3) ◽  
pp. 1422
Author(s):  
Norfishah Ab Wahab ◽  
M. N. Md Tan ◽  
M. N. Hushim
Keyword(s):  
Transmission Lines ◽  
Closed Loop ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Single Mode ◽  
Ring Structure ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Loop Ring

<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>

scholarly journals A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

2017 ◽  
Vol 7 (4) ◽  
pp. 1786-1790
Author(s):  
M. Abdul-Niby ◽  
M. Farhat ◽  
M. Nahas ◽  
Μ. Μ. Alomari
Keyword(s):  
Degrees Of Freedom ◽  
Bandpass Filter ◽  
Wide Band ◽  
Open Loop ◽  
Dual Band ◽  
Center Frequency ◽  
Transmission Zeros ◽  
Harmonic Rejection ◽  
Band Filter ◽  
Loop Ring

This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and bandwidth of the three passbands independently. In addition, the six transmission zeros created around the passbands results in a tri-band filter with high selectivity, sharp 3 dB cut-off frequency, high isolation, low passband insertion-loss and high out-of-band harmonic rejection across an ultra-broadband frequency range up to 17 GHz. The proposed technique has the ability to switch from triple to dual band by removing one pair of the inner resonators. Design methodology and simulation results of the filter are provided.

scholarly journals Fabrication of Compact Microstrip Line-Based Balun-Bandpass Filter with High Common-Mode Suppression

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Chia-Mao Chen ◽  
Shoou-Jinn Chang ◽  
Yen-Liang Pan ◽  
Cheng-Yi Chen ◽  
Cheng-Fu Yang
Keyword(s):  
High Performance ◽  
Bandpass Filter ◽  
Open Loop ◽  
Ring Resonators ◽  
Center Frequency ◽  
Coupled Line ◽  
Common Mode ◽  
New Device ◽  
Line Theory ◽  
Loop Ring

A new type of balun-bandpass filter was proposed based on the traditional coupled-line theory and folded open-loop ring resonators (OLRRs) configuration. For that, a new device with both filter-type and balun-type characteristics was investigated and fabricated. Both magnetic and electric coupling structures were implemented to provide high performance balun-bandpass responses. The fabricated balun-bandpass filters had a wide bandwidth more than 200 MHz and a low insertion loss less than 2.51 dB at a center frequency of 2.6 GHz. The differences between the two outputs were below 0.4 dB in magnitude and within 180 ± 7° in phase. Also, the balun-bandpass filter presented an excellent common-mode rejection ratio over 25 dB in the passband. An advanced design methodology had been adopted based on EM simulation for making these designed parameters of OLRRs, microstrip lines, and open stubs. The measured frequency responses agreed well with simulated ones.

Spurious Suppression and Design Based on Microstrip Open Loop Ring Resonator Bandpass Filters

2011 ◽  
Vol E94-C (9) ◽  
pp. 1447-1454
Author(s):  
Pichai ARUNVIPAS ◽  
Chokchai SANGDAO ◽  
Ravee PHROMLOUNGSRI
Keyword(s):  
Ring Resonator ◽  
Bandpass Filters ◽  
Open Loop ◽  
Spurious Suppression ◽  
Loop Ring

A compact bandpass filter using open-loop and C-SCMRC resonators with harmonic suppression

2006 ◽  
Vol 48 (5) ◽  
pp. 906-909 ◽  
Author(s):  
Jian-Zhong Gu ◽  
Chuang Wang ◽  
Xiao-Wei Sun
Keyword(s):  
Bandpass Filter ◽  
Open Loop ◽  
Harmonic Suppression
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