Compact Ultra-Wideband Microstrip/Coplanar Waveguide Bandpass Filter
Compact Ultra-Wideband Microstrip/Coplanar Waveguide Bandpass Filter
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DOI：
10.1109/lmwc.2006.890462
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发表时间：
2007-03
影响因子：
3
通讯作者：
N. Thomson;Jiasheng Hong
中科院分区：
文献类型：
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作者：
N. Thomson;Jiasheng Hong
提出了一种新颖的超宽带(UWB)带通滤波器，该滤波器采用紧凑耦合的微带/共面波导(CPW)结构。该滤波器由单个共面波导四分之一波长谐振器组成，该谐振器耦合到公共衬底另一侧的两个微带开路短桩。这两个微带开路短节在中心频率处大约有四分之一波长长，可以起到两个谐振器的作用，并与共面波导有关联的耦合布置。这形成了一个非常紧凑的三极滤光器。所提出的滤波器还表现出准椭圆函数响应，通带两侧各有一个有限频率传输零点。因此，使用少量的谐振器实现了高选择性，这导致了通带上的低插入损耗和群延迟。利用电磁仿真对性能进行了预测，并进行了实验验证。实验结果表明，该滤波器在6.4 GHz的中心频率处有90%的分数带宽，在1.95 GHz和10.36 GHz处有两个可观察到的传输零点(衰减点)。此外，它具有非常小的尺寸，在中心频率仅为0.25×0.08的导波波长
A novel ultra wideband (UWB) bandpass filter is presented, using a compact coupled microstrip/coplanar waveguide (CPW) structure. The filter comprises of a single CPW quarter-wavelength resonator which is coupled to two microstrip open-circuited stubs on the other side of a common substrate. The two microstrip open-circuited stubs, which are about a quarter-wavelength long at the center frequency, can function as two resonators with associated coupling arrangement to the CPW. This forms a very compact three-pole filter. The proposed filter also exhibits a quasi-elliptic function response, with one finite-frequency transmission zero closer to each side of the passband. Thus, a high selectivity is achieved using a small number of resonators, which leads to low insertion loss and group delay across the passband. The performance is predicated using EM simulations and verified experimentally. The experimental filter shows a fractional bandwidth of 90% at a center frequency of 6.4GHz, with two observable transmission zeros (attenuation poles) at 1.95 and 10.36GHz, respectively. Furthermore, it has a very small size only amounting to 0.25 by 0.08 guided wavelength at the center frequency