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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Design of a compact dual-band-notch ultra-wideband bandpass filter based on wave cancellation method
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Design of a compact dual-band-notch ultra-wideband bandpass filter based on wave cancellation method

机译：基于消波法的紧凑型双带陷波超宽带带通滤波器设计

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摘要

In this study, a compact ultra-wideband (UWB) bandpass filter (BPF) with sharp roll-off, improved out-of-band performance and dual-band-notch operation is presented and its design procedure is discussed. In the proposed structure, in order to reject the unwanted harmonic pass bands, a pair of modified cross-shaped coupled lines (CCLs) is implemented along the ports of the filter. Moreover, a pair of half-circle-shaped stubs and a stepped-impedance stub are loaded on the main resonator in order to obtain additional transmission zeros (TZs) which are controllable separately. Implementation of the CCLs and the stub loaded resonator (SLR) reduce the total size of the presented microstrip BPF. Besides, by extending and folding the upper coupled line of each CCLs and also through an open stub which is protruded inside a slot on the main resonator, dual-band-notch operation is added to the performance of the presented filter. The fabricated prototype has a small size and is capable to cover frequency band of 2.8–10.69 GHz with two band-notch functions at 4.9–5.4 and 7.83–8.25 GHz which suppresses the interference between UWB spectrum with wireless local area network (WLAN) and satellite communication frequency bands, respectively. The proposed filter has a compact size while showing good return loss and insertion loss characteristic in the frequency band of interest.
机译：在这项研究中，提出了一种紧凑的超宽带（UWB）带通滤波器（BPF），具有急剧的滚降，改进的带外性能和双频带陷波操作，并讨论了其设计过程。在所提出的结构中，为了拒绝不希望的谐波通带，沿着滤波器的端口实施了一对修改的十字形耦合线（CCL）。此外，在主谐振器上装有一对半圆形短截线和一个阶梯式阻抗短截线，以便获得可单独控制的附加传输零位（TZ）。 CCL和短管加载谐振器（SLR）的实现减小了所提出的微带BPF的总尺寸。此外，通过延伸和折叠每个CCL的上耦合线，并通过一个突出在主谐振器上的一个槽内的开口短截线，双带陷波操作被添加到所提出的滤波器的性能中。所制造的原型具有较小的尺寸，并且能够覆盖2.8–10.69 GHz的频带，并具有4.9–5.4和7.83–8.25 GHz的两个频带陷波功能，从而抑制了UWB频谱与无线局域网（WLAN）和卫星通信频段。所提出的滤波器具有紧凑的尺寸，同时在感兴趣的频带中表现出良好的回波损耗和插入损耗特性。

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