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
引用
收藏
页码：1124 / 1130
页数：7
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