Electrical Tunable Microstrip LC Bandpass Filters With Constant Bandwidth

被引：83
|
作者：
Xiang, Qianyin [1 ]
Feng, Quanyuan [1 ]
Huang, Xiaoguo [1 ]
Jia, Dinghong [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Informat Sci & Technol, Chengdu 610031, Peoples R China
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2013年 / 61卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Constant bandwidth; microstrip LC filter; tunable filter; METAMATERIAL TRANSMISSION-LINES; SPLIT-RING RESONATORS;
D O I：
10.1109/TMTT.2013.2241781
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this paper, two- and three-pole microstrip LC constant fractional bandwidth (CFBW) and constant absolute bandwidth (CABW) tunable bandpass filters are proposed. The equivalent-circuit models are presented to study the tunable mechanism. The filter can be reconfigured by changing the capacitance of the LC resonators. Based on electric coupling coefficient compensation, second- and third-order tunable equivalent-circuit models with CFBW/CABW are presented. For demonstration, a semiconductor varactor diode loaded microstrip LC resonator is adopted in our work to design the second- and third-order tunable filters. The S-parameters, group delays, and third-order intercept points for different center frequencies of the filters are presented. Each resonator requires only one varactor diode for both central frequency and resonator coupling coefficient control
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页码：1124 / 1130
页数：7
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