NDLI: Design of Miniaturized Microstrip LPF and Wideband BPF With Ultra-Wide Stopband

Content Provider	IEEE Xplore Digital Library
Author	Jin Xu Yu-Xue Ji Wen Wu Chen Miao
Copyright Year	2001
Abstract	This letter presents a novel lowpass filter (LPF) structure which consists of a section of high-impedance microstrip line (HIML) with a pair of radial stubs (RSs) loaded at its center and a pair of stepped-impedance open stubs (SIOSs) loaded on both ends of HIML. The RSs loaded HIML exhibits a lowpass property and has a wide stopband. The loaded SIOSs not only can improve the roll-off rate of LPF significantly but also is able to extend the stopband. Based on such a LPF structure, a pair of highpass shorted HIMLs are paralleled on both sides of LPF to construct a wideband bandpass filter (BPF) with wide stopband. To validate the proposed method, two filters, i.e., a LPF with cutoff frequency f_c at 1.07 GHz and a BPF centered at f₀ = 0.89 GHz with -3 dB fractional bandwidth of 87%, are designed and fabricated. The measured results show the fabricated LPF has a -20 dB isolation bandwidth from 1.27 f_c to 13.7f_c while the fabricated BPF has a -20 dB isolation bandwidth from 1.56 f₀ to 15 f0. Moreover, the fabricated LPF and BPF also have the compact size of 0.107 λ_gc ×0.083 λ_gc and 0.123 λ_g0 ×0.073 λ_g0, respectively. Good agreement can be observed between the simulation and measurement.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	397
Ending Page	399
Page Count	3
File Size	760051
File Format	PDF
ISSN	15311309
Volume Number	23
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	wideband Bandpass filter (BPF) lowpass filter (LPF) radial stub ultra-wide stopband
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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