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2016-11-09
Compact UWB Filter with High Selectivity and a Deep Notched Band
By
Progress In Electromagnetics Research Letters, Vol. 63, 123-128, 2016
Abstract
A compact ultra-wideband (UWB) bandpass filter with high selectivity and deep notched band attenuation is presented in this letter. The main structure of this filter is a balun-based coplanar waveguide (CPW)-microstrip-CPW transition. This structure has UWB bandpass characteristic (2.85-11 GHz) and a transmission zero at its lower transition band. To achieve a transmission zero at its upper transition band, some complementary split ring resonators (CSRR) are added in the ground of microstrip. Therefore, this filter, whose skirt factor is 89%, presents high selectivity. Then, a notched band is created by short-ended stubs for 5.5 GHz WLAN. Owing to the stepped impedance characteristic of these stubs, this filter achieves -41 dB deep notch in its S21. Besides, the size of the whole filter is only 0.38λg*0.45λg. The simulated and measured results agree well with each other.
Citation
Haodong Lin, Xinlin Xia, Zhenyu Guo, and Tao Yang, "Compact UWB Filter with High Selectivity and a Deep Notched Band," Progress In Electromagnetics Research Letters, Vol. 63, 123-128, 2016.
doi:10.2528/PIERL16092802
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