Wide stopband bandpass filters based on quarter‐wavelength resonators

2017 ◽  
Vol 11 (10) ◽  
pp. 1379-1388 ◽  
Author(s):  
Cong Tang ◽  
Xianqi Lin ◽  
Wangmao Liu ◽  
Yong Fan
Keyword(s):  
Bandpass Filters ◽  
Quarter Wavelength

scholarly journals High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

2020 ◽  
Author(s):  
Xiaohu Wu ◽  
Xiaoguang Liu ◽  
Yingsong Li
Keyword(s):  
Transmission Line ◽  
Detailed Analysis ◽  
Bandpass Filters ◽  
Design Concept ◽  
Coupled Line ◽  
Input And Output ◽  
Quarter Wavelength ◽  
Measurement Results ◽  
In Series ◽  
Simultaneous Input

In this article, we present the first demonstration of distributed and symmetrical all-band quasi-absorptive filters that can be designed to arbitrarily high orders. The proposed quasi-absorptive filter consists of a bandpass section (reflective-type coupled-line filter) and absorptive sections (a matched resistor in series with a shorted quarter-wavelength transmission line). Through a detailed analysis, we show that the absorptive sections not only eliminate out-of-band reflections but also determine the passband bandwidth (BW). As such, the bandpass section mainly determines the out-of-band roll-off and the order of the filter can be arbitrarily increased without affecting the filter BW by cascading more bandpass sections. A set of 2.45-GHz one-, two-, and three-pole quasi-absorptive microstrip bandpass filters are designed and measured. The filters show simultaneous input and output absorption across both the passband and the stopband. Measurement results agree very well with the simulation and validate the proposed design concept.

MICROSTRIP BANDPASS FILTERS BASED ON INDUCTIVE-COUPLED STEPPED-IMPEDANCE QUARTER-WAVELENGTH RESONATORS

2014 ◽  
Vol 44 ◽  
pp. 101-106 ◽  
Author(s):  
Fei Cheng ◽  
Xianqi Lin ◽  
Yuan Jiang ◽  
Kaijun Song ◽  
Yong Fan
Keyword(s):  
Bandpass Filters ◽  
Quarter Wavelength

New Coupling Scheme for Microstrip Bandpass Filters With Quarter-Wavelength Resonators

2008 ◽  
Vol 56 (12) ◽  
pp. 2930-2935 ◽  
Author(s):  
Tsung-Nan Kuo ◽  
Shih-Cheng Lin ◽  
Chi-Hsueh Wang ◽  
Chun Hsiung Chen
Keyword(s):  
Bandpass Filters ◽  
Coupling Scheme ◽  
Quarter Wavelength

Novel Compact Interdigital Bandpass Filters with Multilayer Stepped Impedance Resonators/Folded Quarter–Wavelength Resonators

2013 ◽  
Vol 547 ◽  
pp. 19-24
Author(s):  
Jia Min Wu ◽  
Tian Bai ◽  
Wen Zhong Lu ◽  
Fei Liang ◽  
Bin Luo
Keyword(s):  
High Frequency ◽  
Bandpass Filters ◽  
Excellent Performance ◽  
High Frequency Structure Simulator ◽  
Dielectric Layers ◽  
Frequency Structure ◽  
Quarter Wavelength ◽  
Two Measures ◽  
Novel Structures

Novel compact interdigital bandpass filters (BPFs) which used multilayer stepped impedance resonators (SIRs)/folded quarter–wavelength resonators were presented. Two measures were taken to reduce the sizes of the proposed filters. Firstly, two resonators (SIRs and folded quarter–wavelength resonators) with novel structures were designed. Secondly, all the designed resonators were located on different dielectric layers. The proposed interdigital BPFs, which were simulated with the high frequency structure simulator (HFSS), show excellent performance and could realize the miniaturization purpose. Furthermore, it is found that the proposed filter with folded quarter–wavelength resonators is more excellent in realizing miniaturization and improving performance than that with SIRs.

Ultra-Wideband (UWB) Bandpass Filter Using Multi-Mode SIR

2013 ◽  
Vol 760-762 ◽  
pp. 241-245
Author(s):  
Jian Kang Xiao ◽  
Wu Zhu ◽  
Yong Li ◽  
Wei Zhao
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Ultra Wideband ◽  
Input And Output ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Multi Mode ◽  
Multiple Transmission

New ultra-wideband (UWB) bandpass filters are proposed by using stepped-impendence resonators (SIRs) and stub-loaded SIRs, aiming at transmitting the signals in the whole UWB passband of 3.1GHz-10.6GHz. Each of the proposed UWB filters consists of two parallel but oppositely arranged compact SIR with tri or quad-section or stub-loaded SIR. In the design, the first two or three resonances of the proposed resonators are properly adjusted to be placed within the UWB. In order to enhance the coupling degree, pairs of quarter-wavelength parallel-coupled lines are longitudinally stretched in both the input and output sides. The UWB bandpass filters behave multiple transmission poles and good return loss of no less than 15dB. A proposed UWB filter is fabricated and measured, and the experiment demonstrates the design.

Design and Performance of Miniaturized Quarter-Wavelength Resonator Bandpass Filters With Attenuation Poles

2005 ◽  
Vol 15 (2) ◽  
pp. 1016-1019 ◽  
Author(s):  
H. Kanaya ◽  
K. Kawakami ◽  
F. Koga ◽  
Y. Kanda ◽  
K. Yoshida
Keyword(s):  
Bandpass Filters ◽  
Quarter Wavelength ◽  
And Performance
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