Journal ArticleDOI
Stopband-Expanded Low-Pass Filters Using Microstrip Coupled-Line Hairpin Units
TLDR
In this paper, a class of stopband-expanded low-pass filters via attenuation poles of microstrip coupled-line hairpin unit is proposed via tap-connecting this coupled line unit and adjusting its coupling strength.Abstract:
In this letter, a class of stopband-expanded low-pass filters (LPFs) is proposed via attenuation poles of microstrip coupled-line hairpin unit. By centrally tap-connecting this coupled-line unit and adjusting its coupling strength, three attenuation poles can be excited above the desired low passband. A coupled-line-oriented closed-form model is then constructed to provide a physical insight into the excitation of these poles and to execute an efficient synthesis design of this LPF. Two prototype filters with single and two units are finally designed with the specified cutoff frequency at 2.5 GHz. Measured results of the fabricated filters evidently demonstrate good LPF performance, sharp roll-off skirt, and a wide upper-stopband of 3.2 to 11.8 GHz with the insertion loss higher than 20.0 dB.read more
Citations
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Journal ArticleDOI
Sharp Roll-Off Lowpass Filter With Wide Stopband Using Stub-Loaded Coupled-Line Hairpin Unit
TL;DR: In this article, a novel application of shunt open-stubs at the feed points of a center fed coupled-line hairpin resonator is presented for the design of compact lowpass filter (LPF) with very wide stopband.
Journal ArticleDOI
Design of Sharp Roll-Off Lowpass Filter With Ultra Wide Stopband
TL;DR: In this paper, a microstrip lowpass filter is proposed to achieve an ultra wide stopband with 12th harmonic suppression and extremely sharp skirt characteristics, and the operating mechanism of the filter is investigated based on proposed equivalent-circuit model, and an overall good agreement between measured and simulated results is observed.
Journal ArticleDOI
Wide-Stopband Bandpass Filters Using Asymmetric Stepped-Impedance Resonators
Chan Ho Kim,Kai Chang +1 more
TL;DR: In this paper, a bandpass filter with a wide stopband using asymmetric stepped-impedance resonators (SIRs) was proposed. But the performance of the proposed filter was limited to -23.7 dB up to 10.6 dB.
Journal ArticleDOI
UWB Bandpass Filter Using Cascaded Miniature High-Pass and Low-Pass Filters With Multilayer Liquid Crystal Polymer Technology
Zhang-Cheng Hao,Jia-Sheng Hong +1 more
TL;DR: In this article, a new ultra-wideband (UWB) bandpass filter that is formed by cascading miniature high-pass and low-pass filters implemented with multilayer liquid crystal polymer technology is presented.
Journal ArticleDOI
A Novel Low-Pass Filter With an Embedded Band-Stop Structure for Improved Stop-Band Characteristics
Qijuan He,Changjun Liu +1 more
TL;DR: In this paper, a band-stop structure is ingeniously embedded into a classical step-impedance microstrip LPF, which is constructed from a simple two transmission line bandstop filter.
References
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Book
Microstrip filters for RF/microwave applications
TL;DR: In this paper, the authors present a general framework for coupling matrix for Coupled Resonator Filters with short-circuited Stubs (UWB) and Cascaded Quadruplet (CQ) filters.
Journal ArticleDOI
Coupled Transmission Line Networks in an Inhomogeneous Dielectric Medium
A.K. Johnson,G.I. Zysman +1 more
TL;DR: In this paper, the ABCD parameters of two-port networks composed of two identical, coupled transmission lines embedded in an inhomogeneous dielectric (e.g., suspended substrate, microstrip) are investigated.
Journal ArticleDOI
Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators
Lung-Hwa Hsieh,Kai Chang +1 more
TL;DR: In this article, a compact elliptic-function low-pass filter using microstrip stepped-impendance hairpin resonators and their equivalent-circuit models is developed.
Journal ArticleDOI
Small Elliptic-Function Low-Pass Filters and Other Applications of Microwave C Sections
TL;DR: In this article, a type of elliptic-function low-pass filter that is easy to design and construct, has low passband loss, and is very compact is described.
Proceedings ArticleDOI
A design of the harmonic rejection coupled line low-pass filter with attenuation poles
TL;DR: In this paper, the harmonic rejection low-pass filter using coupled lines is proposed, which provides compact size, low insertion loss and wide stop band range up to five times of the cutoff frequency.
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