NDLI: Dual-wideband filter with wide high-rejection band using composite resonators

Content Provider	IET Digital Library
Author	Li, Zhiliang Wu, Ke Li
Abstract	A new type of dual-wideband bandpass filter using composite series and shunt resonators is proposed in conjunction with its direct synthesis and design theory. By making use of the transmission pole (TP) and the transmission zero of the composite resonators flexibly, a dual-wideband filter with a wide range of frequency and bandwidth ratios as well as a wide stopband can be realised. With a shunt capacitor introduced at each I/O port, extra TPs either in the low passband or in the high passband can be created, leading to more filter design options. To give a direct design procedure, a lumped-element prototype is first synthesised based on a target filtering function and a dedicated circuit extraction process. The filter layout can be realised using semi-distributed circuits and chip capacitors. Two practical schemes are introduced to suppress spurious resonances for a wide high-rejection stopband. Two filter examples are designed with a small and a large frequency ratio and a wide band suppressed spurious resonances. The unique filter response and good agreement between the designed and measured results demonstrate the superior performance of the proposed filter structure and the effectiveness of the synthesis and design theory.
Starting Page	291
Ending Page	299
Page Count	9
ISSN	17518725
Volume Number	13
e-ISSN	17518733
Issue Number	Issue 3, Feb (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5177
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-01-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass Filter Capacitor Composite Series Resonator Dedicated Circuit Extraction Process Direct Design Procedure Dual-wideband Bandpass Filter Filter And Other Network Filter Design Options Filter Layout Filter Structure Poles And Zeros Resonator Filter Shunt Capacitor Shunt Resonator Target Filtering Function Transmission Pole Transmission Zero Unique Filter Response Waveguide And Microwave Transmission Line Component Wide Band Suppressed Spurious Resonances Wide High-rejection Stopband
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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