| 一种中心和带宽可调VHFL 频段耦合滤波器设计 |
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| 引用本文： | 房丽丽 王学田 刘春明. 一种中心和带宽可调VHFL 频段耦合滤波器设计[J]. 微波学报, 2012, 28(S2): 338-342 |
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| 作者姓名： | 房丽丽 王学田 刘春明 |
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| 作者单位： | 北京理工大学信息与电子学院，北京 100081 |
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| 摘 要： | 针对典型电调谐耦合滤波器的两种结构：电感耦合和电容耦合，对滤波器的带宽影响因素进行了理论分析，通过改变电容耦合单元使得中心频率变化时带宽保持不变。选择了NXP 的BB131 作为谐振变容管，选择NXP 的BB132 作为耦合变容管，设计了VHFL 频段中心频率及带宽均可调的双调谐耦合滤波器，利用ADS 软件进行了仿真。仿真结果表明此滤波器在56.9~165.8MHz 的可调范围里，保持接近常数的带宽，矩形系数（30dB/3dB）小于7，具有很好的选择性。实际电路的测试结果验证了设计的有效性。
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| 关 键 词： | 电调谐 耦合滤波器 变容二极管 |
A VHFL-band Center Frequency and Bandwidth Tunable BandpassFilter |
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| FANG Li-li,WANG Xue-tian,LIU Chun-ming. A VHFL-band Center Frequency and Bandwidth Tunable BandpassFilter[J]. Journal of Microwaves, 2012, 28(S2): 338-342 |
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| Authors: | FANG Li-li WANG Xue-tian LIU Chun-ming |
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| Affiliation: | School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | This paper proposes a VHFL-band bandpass filter with simultaneous continuous control of both center freqencyand bandwidth, analyzing the principle of the circuit and predicts the performance with ADS. Simulation results show that theabsolute passband bandwidth could be maintained constantly in 56.9-165.8MHz, and performance of selectivity is high with therectangular coefficient is less than 6. Experimental results validate the feasibility of the proposed tunable filter architecture. |
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| Keywords: | electrically tunable varactor coupling filter |
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