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Wide Passband/Stopband Bandpass Filter Based on Transversal Signal Interference Concepts and Modified Branch-Line Structure

机译:基于横向信号干扰概念和改进分支线结构的宽带/带通滤波器

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摘要

A high selectivity wide passband filter with a broader stopband based onrntransversal signal-interaction concepts and modified branch line structure (MBLS) is developedrnin this article. Two transmission paths, that is, one half-wavelength transmission linernand one MBLS, are used to realize signal transmission from Port 1 to Port 2. Then, tworntransmission zeros are introduced at both lower and upper sides of the passband, which arernused to improve the passband selectivity greatly. The filter bandwidth can be easily controlledrnby reasonable adjusting the coupling coefficient of the coupled lines. Furthermore,rnwith four stubs connected at the input/output ports, the stopband attenuation level isrnimproved greatly. Finally, one prototype filter having 69.1% of 3 dB fractional bandwidthrnis fabricated with advantages of sharp selectivity and high out-of-band rejection. The EMrnsimulated and measured results are presented, and an excellent agreement can bernobtained.
机译:本文基于横向信号交互概念和改进的分支线结构(MBLS),开发了具有更高阻带的高选择性宽带通带滤波器。通过两条传输路径,即一条半波长传输线和一条MBLS,来实现从端口1到端口2的信号传输。然后,在通带的上下两侧都引入了两个传输零点,用于改善带宽。通带选择性很大。通过合理地调整耦合线的耦合系数,可以容易地控制滤波器带宽。此外,通过在输入/输出端口连接四个短截线,阻带衰减水平大大提高。最终,制造出具有69.1%的3 dB分数带宽的原型滤波器,该滤波器具有高选择性和高带外抑制的优势。给出了仿真和测量结果,可以得出很好的一致性。

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