NDLI: Generalised direct matrix synthesis approach for lossless filters

Content Provider	IET Digital Library
Author	He, Yuxing Wang, Gang Sun, Liguo Rushingabigwi, Gerard
Abstract	A generalised direct matrix synthesis is proposed for microwave lossless filters with arbitrary phase shift at centre frequency and complex terminal impedances. The functions of traditional lossless filters, ideal phase shifters, and ideal impedance matching networks are thus substantially combined into one entity to provide an attractive technique for the realisation of compact narrowband microwave front-ends. The synthesis starts with a group of general S-parameters that consider both amplitude and phase responses as well as complex terminations for an Nth-order filter. A transversal array network incorporating resonators as well as non-resonating nodes is then introduced to accommodate the given S-parameters. In result, a canonical (N + 2) × (N + 2) coupling matrix with newly defined source–source and load–load couplings is generated. Some examples, including a fully canonical prototype and a mixed topology diplexer, are demonstrated to show the flexibility of the methodology. Moreover, an eighth-order coaxial cavity filter, with a −120° additional phase shift for S-parameters, is designed and fabricated. The measured results are well consistent with the synthesis ones, which validates the availability of this study in physical implementations.
Starting Page	158
Ending Page	164
Page Count	7
ISSN	17518725
Volume Number	11
e-ISSN	17518733
Issue Number	Issue 2, Jan (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/11/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2016.0318
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-01-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebra Analogue Circuit Compact Narrowband Microwave Front-ends Eighth-order Coaxial Cavity Filter Filter And Other Network Generalised Direct Matrix Synthesis Approach Ideal Impedance Matching Network Ideal Phase Shifters Load–load Couplings Matrix Algebra Microwave Filter Microwave Lossless Filter Mixed Topology Diplexer Phase Shifter Source–source Couplings Transversal Array Network Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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