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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Compact ultra-wideband bandpass filter with variable notch characteristics based on transversal signal-interaction concepts
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Compact ultra-wideband bandpass filter with variable notch characteristics based on transversal signal-interaction concepts

机译：基于横向信号交互概念，具有可变陷波特性的紧凑型超宽带带通滤波器

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摘要

A novel technique is presented to design highly compact microstrip ultra-wideband (UWB) bandpass filters that exhibit high selectivity quasi-elliptical response. The design is based on transversal signal-interaction concepts that enable the inclusion of single or dual notch-bands within the filter's passband to eliminate interference from other services that coexist within the UWB spectrum. The filter configuration comprises of two transmission paths which include folded T-shaped stepped impedance resonators (SIRs) that are capacitively coupled with the input/output lines to enable signal transmission. It is shown that by combining the filters of different passband centre frequencies an UWB filter can be realised with either a single- or dual-notch function. The theoretical performance of the filter is corroborated via measurements to confirm that the proposed filter exhibits UWB passband of 123% for a 3 dB fractional bandwidth, a flat group-delay with maximum variation of less than 0.3 ns, passband insertion loss less than 0.94 dB, high selectivity, a sharp rejection notch-band with attenuation of −23 dB, and a good overall out-of-band performance. Furthermore, the filter occupies a significantly small area of 94 mm2 compared with its classical counterparts. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:549–559, 2014.
机译：提出了一种新颖的技术来设计高度紧凑的微带超宽带（UWB）带通滤波器，该滤波器具有高选择性的拟椭圆响应。该设计基于横向信号交互概念，能够在滤波器的通带中包含单或双陷波带，以消除来自UWB频谱中共存的其他服务的干扰。滤波器配置包括两条传输路径，其中包括折叠的T形阶梯式阻抗谐振器（SIR），这些电容与输入/输出线电容耦合以实现信号传输。结果表明，通过组合不同通带中心频率的滤波器，可以实现具有单陷波或双陷波功能的UWB滤波器。通过测量证实了该滤波器的理论性能，从而证实了所提出的滤波器在3 dB的分带宽下表现出123％的UWB通带，平坦的群时延，最大变化小于0.3 ns，通带插入损耗小于0.94 dB ，高选择性，陡峭的抑制陷波带（衰减为−23 dB）以及良好的整体带外性能。此外，与经典过滤器相比，该过滤器占用的面积非常小，仅为94平方毫米。 ©2014 Wiley Periodicals，Inc. Int J RF和Microwave CAE 24：549–559，2014年。

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