基于耦合模理论的强阻带抑制带通滤波器设计

发布时间：2019-08-20 17:34

【摘要】：为了实现射频收发系统中相邻通道间的信号收发隔离,运用时域耦合模理论设计具有较强的阻带抑制的微带带通滤波器.该滤波器由1个奇偶双模微带谐振单元和1个偶模微带谐振单元构成.3个谐振模式相互耦合,在通带低频侧形成1个传输零点,在高频侧形成2个传输零点.可以实现较高的频率选择性和带内平坦度,在通带的高频侧实现较强的阻带抑制.以C波段的三模耦合微带带通滤波器为例,通过时域耦合模理论对滤波器的滤波特性进行准确计算,得到各个谐振模式之间的耦合关系.通过特征模电磁仿真完成满足该耦合关系的滤波器结构设计.对该滤波器进行实物加工与测试.测试结果与理论计算结果吻合良好.结果表明,该滤波器可以有效地应用于射频收发系统收发通道间的隔离.时域耦合模理论可以实现多模耦合滤波器的高效设计,快速得到系统所需的滤波特性.
[Abstract]:In order to realize the signal transmission and reception isolation between adjacent channels in the radio-frequency transceiver system, a microstrip band-pass filter with strong stop-band rejection is designed by using the time-domain coupling mode theory. The filter is composed of one odd-even dual-mode micro-strip resonance unit and one even-mode micro-strip resonance unit, and the three resonance modes are mutually coupled, and one transmission zero point is formed at the low-frequency side of the pass band, and two transmission zeros are formed on the high-frequency side. A higher frequency selectivity and an in-band flatness can be achieved, and stronger stop-band suppression is achieved on the high-frequency side of the pass band. Taking the three-mode coupled microstrip band-pass filter of the C-band as an example, the filtering characteristic of the filter is accurately calculated by the time-domain coupling mode theory, and the coupling relation between the various resonance modes is obtained. And the filter design of the filter meeting the coupling relation is completed by the electromagnetic simulation of the characteristic mode. The filter is processed and tested in kind. The result of the test is in good agreement with the theoretical calculation results. The results show that the filter can be effectively applied to the isolation between the transceiver channels of the RF transceiver system. The time-domain coupled mode theory can realize the high-efficiency design of the multi-mode coupling filter, and can quickly obtain the filtering characteristic required by the system.
【作者单位】：浙江大学航空航天学院;
【基金】：国家自然科学基金资助项目(61401395) 中央高校基本科研业务费专项资助项目(2014QNA4033) 浙江省教育厅资助项目(Y201533913)
【分类号】：TN713.5

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