scholarly journals Investigation of Compact Balun-Bandpass Filter Using Folded Open-Loop Ring Resonators and Microstrip Lines

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chia-Mao Chen ◽  
Shoou-Jinn Chang ◽  
Sung-Mao Wu ◽  
Yuan-Tai Hsieh ◽  
Cheng-Fu Yang
Keyword(s):  
Design Methodology ◽  
Bandpass Filter ◽  
Open Loop ◽  
Ring Resonators ◽  
Center Frequency ◽  
Microstrip Lines ◽  
Rejection Ratio ◽  
Low Insertion Loss ◽  
Em Simulation ◽  
Loop Ring

A balun-bandpass filter was proposed by using two folded open-loop ring resonators (OLRRs) to couple three microstrip lines. By tuning the size of the OLRR, the operating frequency of the balun-bandpass filter could be tuned to the needed value. By tuning the size of open stub at the end of microstrip lines, the balanced impedance of the balun-bandpass filter could also be tuned. The fabricated balun-bandpass filter had a wide bandwidth and a low insertion loss at center frequency of the passband. The balun-bandpass filter presented an excellent in-band balanced performance with common-mode rejection ratio more than 20 dB in the passbands. An advanced design methodology had been adopted based on EM simulation for making these designed parameters of OLRRs and microstrip lines. Good correlation was seen between simulation and measurement, and the result was that first run pass had been achieved in the majority of our designs.

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.

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 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

A novel tri-band filter using stub-loaded open loop ring resonators

2010 ◽  
Vol 52 (3) ◽  
pp. 523-526 ◽  
Author(s):  
Xin Lai ◽  
Bian Wu ◽  
Tao Su ◽  
Chang-Hong Liang
Keyword(s):  
Open Loop ◽  
Ring Resonators ◽  
Band Filter ◽  
Loop Ring

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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