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首页> 外文期刊>Journal of Electromagnetic Waves and Applications >Design and analysis of a compact dual-mode dual-band microstrip bandpass filter
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Design and analysis of a compact dual-mode dual-band microstrip bandpass filter

机译：紧凑型双模双带微带通滤波器的设计与分析

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摘要

Design and fabrication of compact dual-mode dual-band microstrip bandpass filters with a novel feed scheme is presented. The proposed filters have two square loop resonators for two passbands, and each resonator is fed by the feedlines located at the upper corners of the resonators. By using the perturbation elements such as patches or corner-cuts, two degenerate modes of each passband can be easily excited, so mode frequencies and transmission zeros of the passbands can be controlled independently. Also, the proposed feed scheme provides the harmonic suppression for the first passband. In addition, theoretical results have been obtained by using an equivalent circuit model, and a coupling scheme is also presented. The designed filters have an electrical length of 0.25λ_g × 0.25λ_g for the quarter wavelength resonator, where λ_g is the guided wavelength at 1.8 GHz. Two bandpass filters having elliptical and linear phase filtering characteristics in each passband have been designed, fabricated, and tested. Measured results are in an excellent agreement with simulated and calculated ones. In all frequency responses, return losses are better than 15 dB and insertion losses are at acceptable values for both passbands.
机译：提出了一种具有新型馈电方案的紧凑型双模双带微带带通滤波器的设计与制造。所提出的滤波器具有用于两个通带的两个方形环路谐振器，并且每个谐振器由位于谐振器上角的馈电线馈电。通过使用诸如补丁或切角之类的扰动元素，每个通带的两个简并模式可以很容易地激发，因此通带的模式频率和传输零点可以独立控制。同样，提出的馈电方案为第一通带提供谐波抑制。另外，通过使用等效电路模型获得了理论结果，并提出了一种耦合方案。对于四分之一波长谐振器，设计的滤波器的电长度为0.25λ_g×0.25λ_g，其中λ_g是1.8 GHz时的引导波长。已经设计，制造和测试了在每个通带中具有椭圆和线性相位滤波特性的两个带通滤波器。测量结果与模拟和计算结果非常吻合。在所有频率响应中，两个通带的回波损耗均优于15 dB，插入损耗均处于可接受的值。

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