Tunable microwave filters based on discrete ferroelectric and semiconductor varactors

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	Tunable microwave filters based on discrete ferroelectric and semiconductor varactors
	Wang, X ; Bao, P ; Jackson, TJ ; Lancaster, MJ
刊名	IET MICROWAVES ANTENNAS & PROPAGATION
	2011
卷号	5 期号:7 页码:776
关键词	THIN-FILM BANDPASS FILTER TITANATE CAPACITORS RF SYSTEMS DEVICES PLANAR
ISSN号	1751-8725
通讯作者	Wang, X (reprint author), Univ Birmingham, Sch Elect Elect & Comp Engn, Birmingham B15 2TT, W Midlands, England.
中文摘要	This study presents a direct comparison between semiconductor and barium strontium titanate (BST) tuning technologies. Tapped line combline two-pole and four-pole bandpass filters were designed in a coplanar waveguide configuration. Discrete BST interdigital capacitors were fabricated and integrated into the filter circuits in a hybrid manner. The BST varactors performed as tuning elements in the filters. The same filter was also made using gallium arsenide (GaAs) varactors and the tuning and loss performance were compared with the BST filters. The centre frequency of the two-pole BST filter tuned 30.3% from 1.55 to 2.02 GHz with insertion loss ranging from 3.7 to 1.1 dB, at an electric field of 6.5 V/mu m. This filter has a figure of merit of 0.87 dB(-1). The two-pole GaAs filter showed a wide tuning range from 0.94 to 2.44 GHz at 14 V with insertion loss ranging from 4.2 to 0.8 dB. The results are discussed in detail, as it is important to clarify the comparison with relation to the quality of the materials, as well as the particular filter designs and centre frequencies involved.
收录类别	SCI
资助信息	Engineering and Physical Sciences Research Council [EP/C520300/1]
语种	英语
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/46171]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wang, X,Bao, P,Jackson, TJ,et al. Tunable microwave filters based on discrete ferroelectric and semiconductor varactors[J]. IET MICROWAVES ANTENNAS & PROPAGATION,2011,5(7):776.
APA	Wang, X,Bao, P,Jackson, TJ,&Lancaster, MJ.(2011).Tunable microwave filters based on discrete ferroelectric and semiconductor varactors.IET MICROWAVES ANTENNAS & PROPAGATION,5(7),776.
MLA	Wang, X,et al."Tunable microwave filters based on discrete ferroelectric and semiconductor varactors".IET MICROWAVES ANTENNAS & PROPAGATION 5.7(2011):776.