Tunable band-pass filter with wide stopband and high selectivity using centre-loaded coupled structure

Zhu, He and Abbosh, Amin (2015) Tunable band-pass filter with wide stopband and high selectivity using centre-loaded coupled structure. IET Microwaves, Antennas and Propagation, 9 13: 1371-1375. doi:10.1049/iet-map.2014.0770

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Author Zhu, He
Abbosh, Amin
Title Tunable band-pass filter with wide stopband and high selectivity using centre-loaded coupled structure
Journal name IET Microwaves, Antennas and Propagation   Check publisher's open access policy
ISSN 1751-8733
1751-8725
Publication date 2015-10-22
Year available 2015
Sub-type Article (original research)
DOI 10.1049/iet-map.2014.0770
Open Access Status Not yet assessed
Volume 9
Issue 13
Start page 1371
End page 1375
Total pages 5
Place of publication Herts, United Kingdom
Publisher Institution of Engineering and Technology
Collection year 2016
Language eng
Abstract A tunable band-pass filter using a coupled structure that is centrally tapped with a resonator is proposed for wideband applications. The utilised resonator includes parallel-coupled lines loaded with a short-ended varactor. The resonator enables the independent tunability of two transmission zeroes (TZs), which define the passband of the filter. Moreover, the structure creates multiple TZs in upper stopband which enable realising a wide spurious-free stopband. A thorough theoretical analysis is used to verify the performance and calculate the initial design parameters. To validate the proposed design procedure, a prototype is designed, fabricated and tested. The simulated and measured results agree with the derived theory, and indicate a tuning range for the 3 dB bandwidth from 47.8 to 105.7% with, 1.4 dB of insertion loss and more than 12 dB of return loss. It also has more than 18 dB of attenuation across a stopband extending to around four times the centre frequency.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Information Technology and Electrical Engineering Publications
 
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