Design of Controllable Dual-Band Bandpass Filter using Open Loop Triangular Ring Resonators Loaded with Stub Coupled with Transmission Line

This paper studies a very simple structure for dual-band bandpass filter. Filter is composed of two asymmetric coupled resonator circuit by two sets of different size stepped impedance resonator. This circuit applied microstrip line, coupling principle and impedance ratio by controlling the stepped impedance resonator to control the center frequency 2.6/5.2 GHz of the first and the second bandpass filter. The basic structure of the filter is constituted by the three sections of transmission line and two sets of SIR, that is, in two gaps of the three sections of transmission line parallel connection the equivalent inductances and capacitor of the two sets of SIR in series with the resonant circuit (LCL) to constitute bandpass filter. The low frequency 2.6 GHz is through the upper half of low impedance SIR, and the high frequency 5.2 GHz is through the lower half of high impedance SIR. This paper presents the design of asymmetric SIR-based dual-band bandpass filter, the filter structure is simple, easy to produce and can control the characteristics of the passband center frequency. By electromagnet simulation software( IE3D ) to simulate, the actual production of the circuit using a vector analyzer measurement, simulation and measurement results show good consistency.

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Compact SIW dual-band bandpass filter using novel dual-resonance quasi-SIW-transmission-line-structure resonators

The Journal of Engineering ◽

10.1049/joe.2016.0199 ◽

2016 ◽

Vol 2016 (8) ◽

pp. 291-293 ◽

Cited By ~ 1

Author(s):

Hezheng Wsx ◽

Ying Wu

Keyword(s):

Transmission Line ◽

Bandpass Filter ◽

Dual Band ◽

Line Structure ◽

Dual Resonance

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.321-324.376 ◽

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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Microstrip dual-band bandpass filters using parallel-connected open-loop ring resonators

International Journal of RF and Microwave Computer-Aided Engineering ◽

10.1002/mmce.20280 ◽

2008 ◽

Vol 18 (3) ◽

pp. 219-224 ◽

Cited By ~ 4

Author(s):

Lung-Hwa Hsieh ◽

Gerald L. Stolarczyk ◽

Kai Chang

Keyword(s):

Bandpass Filters ◽

Open Loop ◽

Ring Resonators ◽

Dual Band ◽

Loop Ring

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

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.1209 ◽

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.

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