NDLI: Sharp roll-off planar lowpass filter with ultra-wide stopband up to 40 GHz

Content Provider	IET Digital Library
Author	Jiang, Shu Xu, Jinping
Abstract	A microstrip planar lowpass filter (LPF) with sharp roll-off and ultra-wide stopband up to 40 GHz is presented. The central part of the LPF consists of three basic circular sectors, two smaller quadrants and a number of high-impedance lines that are cross-coupled to form a high cut-off rate and a moderate stop band from 2.3 to 10 GHz. Then, four types of resonator cells, three of which are high-impedance lines loaded with semi-circulars and one of which comprises folded step-impedance lines, are added to the central part to generate additional transmission zeroes up into Ka band. As a result, an ultra-wide stopband with 18th-harmonic suppression has been attained. A demonstration filter with 3 dB cut-off frequency of 1.96 GHz has been designed and fabricated. The measured results show that the relative stopband bandwidth of the LPF is 180% with suppression level >25 dB, and the roll-off rate is 104 dB/GHz. The functional area size of the LPF is 18.4 × 11.6 mm, which corresponds to 0.189 × 0.121λ g (λ g is the guided wavelength at f c).
Starting Page	734
Ending Page	735
Page Count	2
ISSN	00135194
Volume Number	53
e-ISSN	1350911X
Issue Number	Issue 11, May (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/53/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.1238
Journal	Electronics Letters
Publisher Date	2017-05-02
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-stop Filter Demonstration Filter Filter And Other Network Folded Step-impedance Line Frequency 1.96 GHz Frequency 2.3 GHz to 10 GHz Harmonic Suppression Ka Band Low-pass Filter Microstrip Filter Microstrip Planar LPF Relative Stopband Bandwidth Resonator Cell Sharp Roll-off Planar Low-pass Filter Transmission Zero Ultrawide-stopband LPF Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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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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