NDLI: Compact tunable dual/Tri-band bandpass filters with multiple zeros

Content Provider	IET Digital Library
Author	Wang, Zhi Peng Wang, Li Tian Zhou, Jie Zhang, Sheng fang He, Ming Ji, Lu Zhang, Xu Chen, Hai hua Wang, Hong peng
Abstract	Here, compact dual/tri-band bandpass filters (BPFs) with tunable passbands are proposed. The multiband BPFs are designed by combining a BPF with tunable passband and a BPF with fixed passband using a common external coupling line. The former consists of a dual-mode resonator loaded with varactors (DMVLR) and the latter is composed of a quad-mode resonator (QMR). The classical analysis method of odd/even mode is employed to analyse the characteristics of the resonators. The centre frequency (CF) of the tunable passband can be easily tuned by varying the voltage imposed on the varactors. A constant absolute bandwidth (CABW) is obtained over the whole tuning range of frequency by properly adjusting loading positions of the varactors. The single and dual-passband BPFs with fixed passband are obtained by designing the parameters of QMR appropriately. Simulation and measurement results show that the proposed BPFs are of high selectivity, and the resultant filters are of compact size. In addition, the proposed multiband BPFs have four transmission zeroes (TZs). There are two self-adaptive TZs on both sides of the tunable passbands, which are generated by the multipath coupling structure.
Starting Page	1023
Ending Page	1030
Page Count	8
ISSN	17518725
Volume Number	13
e-ISSN	17518733
Issue Number	Issue 7, Jun (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/13/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.6020
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-02-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass Filter Common External Coupling Line Compact Tunable Dual-tri-band Bandpass Filter Constant Absolute Bandwidth Dual-mode Resonator Dual-passband BPF Multiband BPF Multipath Coupling Structure Odd-even Mode Passive Filter Passive Network Quad-mode Resonator Resonator Filter Single Passband BPF Transmission Zeroes Varactors Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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