Synthesis and design of tunable bandpass filters with constant absolute bandwidth using varactor-loaded microstrip resonator
Huang X.1; Feng Q.1; Zhu L.2; Xiang Q.1; Jia D.1
2014
Source PublicationInternational Journal of RF and Microwave Computer-Aided Engineering
ISSN1099047X 10964290
Volume24Issue:6Pages:681-689
Abstract

This article presents two new types of tunable filters with constant absolute bandwidth using varactor-loaded microstrip resonators. First, the second- and third-order Butterworth tunable filters are designed based on the parallel coupled-line J inverters. Second, a fourth-order Chebyshev tunable filter is designed based on the alternative J/K inverters, in this design, two adjacent resonators are coupled with each other through a short-circuited transmission line as the K inverter. The proposed two topologies can be easily extended to high-order tunable filter. Three tunable bandpass filters with J and alternative J/K inverters, respectively, are built with a tuning range from â1.8 to â2.3 GHz. The measured second-order filter has a 3-dB bandwidth of 160 ±â€‰6 MHz and an insertion loss of 2.4-3.8 dB. The third-order filter shows a 3-dB bandwidth of 197 ±â€‰5 MHz and an insertion loss of 3.8-4.8 dB. The fourth-order filter shows a 3-dB bandwidth of 440 ±â€‰5 MHz and an insertion loss of 2.1-2.6 dB. For all the designed filters, the measured results are found in excellent agreement with the predicted and simulated results.

KeywordConstant Absolute Bandwidth J/k Inverters Tunable Bandpass Filter Varactor-loaded Resonator
DOI10.1002/mmce.20812
URLView the original
Indexed BySCI
WOS Research AreaComputer Science ; Engineering
WOS SubjectComputer Science, Interdisciplinary Applications ; Engineering, Electrical & Electronic
WOS IDWOS:000343868900007
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Cited Times [WOS]:12   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Affiliation1.Southwest Jiaotong University
2.Universidade de Macau
Recommended Citation
GB/T 7714
Huang X.,Feng Q.,Zhu L.,et al. Synthesis and design of tunable bandpass filters with constant absolute bandwidth using varactor-loaded microstrip resonator[J]. International Journal of RF and Microwave Computer-Aided Engineering,2014,24(6):681-689.
APA Huang X.,Feng Q.,Zhu L.,Xiang Q.,&Jia D..(2014).Synthesis and design of tunable bandpass filters with constant absolute bandwidth using varactor-loaded microstrip resonator.International Journal of RF and Microwave Computer-Aided Engineering,24(6),681-689.
MLA Huang X.,et al."Synthesis and design of tunable bandpass filters with constant absolute bandwidth using varactor-loaded microstrip resonator".International Journal of RF and Microwave Computer-Aided Engineering 24.6(2014):681-689.
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