科研之友
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摘要
A novel ultra-wideband (UWB) bandpass filter (BPF) is proposed and implemented in this article. The proposed UWB BPF has a highly rejected notched band and improved out-of-band performances. It is composed of two cascaded interdigital hairpin resonator units and four semicircle defected ground structures (S-DGS). The interdigital hairpin resonator unit and S-DGS with different dimensions are theoretically analyzed. The equivalent circuit of S-DGS is also presented. The working frequency band of the proposed UWB BPF is 3.1 to 10.6 GHz and the notched band is 7.5 to 7.6 GHz. Good insertion and return losses and high out-of-band rejections are achieved as demonstrated in both simulation and experiment.
