NDLI: Compact microstrip lowpass filter with ultra-wide stopband based on dual-plane structure

Content Provider	IET Digital Library
Author	Jiang, Shu Xu, Jinping
Abstract	A microstrip lowpass filter (LPF) with ultra-wide stopband suppression and compact size based on dual-plane structure is presented. The LPF is composed of high-impedance resonators loaded by folded patches on the topside plane, combined with hybrid slot and step-impedance resonators on the ground plane. Multiple transmission zeros are created in the stopband region by different resonators. Thus, an ultra-wide stopband with 11th-harmonic suppression is achieved. A demonstration filter with 3 dB cutoff frequency (f c) at 2.45 GHz has been designed, fabricated and measured. Results show that the relative stopband bandwidth is 163.8% with attenuation level of 20 dB. The insertion loss is lower than 0.3 dB and the return loss is better than 17 dB in the passband. The size of the LPF is only 8.90 mm × 8.93 mm, which corresponds to 0.115λ g × 0.116λ g (λ g is the guided wavelength at f c).
Starting Page	607
Ending Page	609
Page Count	3
ISSN	00135194
Volume Number	53
e-ISSN	1350911X
Issue Number	Issue 9, Apr (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/53/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.0637
Journal	Electronics Letters
Publisher Date	2017-03-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	11th-Harmonic Suppression Band-stop Filter Compact Microstrip Lowpass Filter Compact Size Dual-plane Structure Frequency 2.45 GHz Ground Plane Harmonics Suppression Hybrid Slot Low-pass Filter LPF Microstrip Filter Multiple Transmission Zeros Passive Filter Passive Network Resonator Filter Step-impedance Resonator UHF Filter Ultra Wideband Technology Ultra-wide Stopband Suppression Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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