COMPACT UWB FILTER WITH HIGH SELECTIVITY AND A DEEP NOTCHED BAND | Zendy

Haodong Lin | Zendy; Xinlin Xia | Zendy; Zhenyu Guo | Zendy; Tao Yang | Zendy

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COMPACT UWB FILTER WITH HIGH SELECTIVITY AND A DEEP NOTCHED BAND

Author(s) -

Haodong Lin,

Xinlin Xia,

Zhenyu Guo,

Tao Yang

Publication year - 2016

Publication title -

progress in electromagnetics research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.245

H-Index - 33

ISSN - 1937-6480

DOI - 10.2528/pierl16092802

Subject(s) - filter (signal processing) , materials science , selectivity , optoelectronics , acoustics , computer science , physics , chemistry , computer vision , biochemistry , catalysis

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.

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