NDLI: SIW bandpass filters in modified box-section scheme with bypass/constant/frequency-dependent coupling in diagonal cross-coupling path

Content Provider	IET Digital Library
Author	Liu, Qing Zhou, Dong Fang Zhang, De Wei Lv, Da Long
Abstract	Here, three fourth-order bandpass filters (BPFs) in modified box-section schemes using substrate integrated waveguide (SIW) are proposed and researched. The proposed filters are based on a conventional box-section structure with considering bypass/constant/frequency-dependent coupling (FDC) in the diagonal cross-coupling path to construct new filtering responses. Based on the different type of the cross-coupling path, the frequency response of each proposed structure is analysed and presented, which indicates that the proposed filters have flexible response in terms of finite transmission zeros (FTZs). The proposed filters can realise generalised Chebyshev responses with one/two/three FTZs at arbitrary positions. Moreover, one FTZ may be produced by using bypass coupling and direct inductive coupling window to improve lower stopband performance, which is verified by a coupling matrix. For the demonstration, three quasi-elliptic response filters were designed, fabricated, and measured. Good agreement is achieved between simulated and measured results.
Starting Page	559
Ending Page	566
Page Count	8
ISSN	17518725
Volume Number	13
e-ISSN	17518733
Issue Number	Issue 5, Apr (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/13/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5361
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 Band-stop Filter Box-section Structure Bypass-constant-frequency-dependent Coupling Chebyshev Filter Chebyshev Responses Coupling Matrix Cross-coupling Path Diagonal Cross-coupling Path Direct Inductive Coupling Window Elliptic Filter Finite Transmission Zeros Fourth-order Bandpass Filter Frequency Response Modified Box-section Scheme Passive Filter Passive Network Poles And Zeros Quasielliptic Response Filter SIW Bandpass Filter Stopband Performance Substrate Integrated Waveguide Waveguide And Microwave Transmission Line Waveguide And Microwave Transmission Line Component Waveguide Filter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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