High-Q -Factor Tunable Bandpass Filter with Constant Absolute Bandwidth and Wide Tuning Range Based on Coaxial Resonators

Xu, JX; Yang, L; Yang, Y; Zhang, XY

High-Q -Factor Tunable Bandpass Filter with Constant Absolute Bandwidth and Wide Tuning Range Based on Coaxial Resonators

Xu, JX

Yang, L Yang, Y

Zhang, XY

Permalink

Publication Type:: Journal Article
Citation:: IEEE Transactions on Microwave Theory and Techniques, 2019, 67 (10), pp. 4186 - 4195
Issue Date:: 2019-10-01

Closed Access

	Filename	Description	Size
	08765614.pdf	Published Version	3.33 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Xu, JX https://orcid.org/0000-0003-3623-3837	en_US
dc.contributor.author	Yang, L	en_US
dc.contributor.author	Yang, Y https://orcid.org/0000-0001-7439-2156	en_US
dc.contributor.author	Zhang, XY	en_US
dc.date.accessioned	2020-04-05T21:39:46Z
dc.date.available	2020-04-05T21:39:46Z
dc.date.issued	2019-10-01	en_US
dc.identifier.citation	IEEE Transactions on Microwave Theory and Techniques, 2019, 67 (10), pp. 4186 - 4195	en_US
dc.identifier.issn	0018-9480	en_US
dc.identifier.uri	http://hdl.handle.net/10453/139801
dc.description.abstract	© 1963-2012 IEEE. This paper presents a method for designing low-loss varactor-based tunable bandpass filters (BPFs) with constant absolute bandwidth (CABW) and wide tuning range based on coaxial resonators. The whole structure consists of a metallic cavity and a piece of printed circuit board (PCB). Varactors and their biasing components are mounted on the PCB, which are connected to the coaxial resonators to enable frequency tuning. The coupling control between coaxial resonators and the nonsynchronous tuning of the resonators are utilized to realize the CABW over a wide tuning range. Moreover, transmission zeros are generated near the passband, resulting in high skirt selectivity. For demonstration, a second-order tunable coaxial BPF with a wide tuning range from 698 to 960 MHz (31.5%) is designed and fabricated. Due to the use of high- Q -factor coaxial resonators, the proposed tunable filter realizes low insertion losses ranging from 0.82 to 2.03 dB under a narrowband specification. The 1-dB bandwidth is measured as 35.3 ± 2.7 MHz, showing excellent CABW responses. Moreover, a third-order tunable coaxial BPF is also designed and implemented with enhanced skirt selectivity and out-of-band rejection. Comparison with other reported tunable BPFs is given, where the proposed designs show excellent performance of wide tuning range, CABW, high selectivity, and high tuning speed.	en_US
dc.relation.ispartof	IEEE Transactions on Microwave Theory and Techniques	en_US
dc.relation.isbasedon	10.1109/TMTT.2019.2926251	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Networking & Telecommunications	en_US
dc.title	High-Q -Factor Tunable Bandpass Filter with Constant Absolute Bandwidth and Wide Tuning Range Based on Coaxial Resonators	en_US
dc.type	Journal Article
utslib.citation.volume	10	en_US
utslib.citation.volume	67	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	1005 Communications Technologies	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	closed_access	*
pubs.issue	10	en_US
pubs.publication-status	Published	en_US
pubs.volume	67	en_US

Abstract:

© 1963-2012 IEEE. This paper presents a method for designing low-loss varactor-based tunable bandpass filters (BPFs) with constant absolute bandwidth (CABW) and wide tuning range based on coaxial resonators. The whole structure consists of a metallic cavity and a piece of printed circuit board (PCB). Varactors and their biasing components are mounted on the PCB, which are connected to the coaxial resonators to enable frequency tuning. The coupling control between coaxial resonators and the nonsynchronous tuning of the resonators are utilized to realize the CABW over a wide tuning range. Moreover, transmission zeros are generated near the passband, resulting in high skirt selectivity. For demonstration, a second-order tunable coaxial BPF with a wide tuning range from 698 to 960 MHz (31.5%) is designed and fabricated. Due to the use of high- Q -factor coaxial resonators, the proposed tunable filter realizes low insertion losses ranging from 0.82 to 2.03 dB under a narrowband specification. The 1-dB bandwidth is measured as 35.3 ± 2.7 MHz, showing excellent CABW responses. Moreover, a third-order tunable coaxial BPF is also designed and implemented with enhanced skirt selectivity and out-of-band rejection. Comparison with other reported tunable BPFs is given, where the proposed designs show excellent performance of wide tuning range, CABW, high selectivity, and high tuning speed.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/139801