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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2016-11-09
Compact UWB Filter with High Selectivity and a Deep Notched Band
By
Haodong Lin,

    Dr. Haodong Lin

    School of Electronic Engineering

    University of Electronic Science and Technology of China

    China

    Homepage

Xinlin Xia,

    Dr. Xinlin Xia

    School of Electronic Engineering

    University of Electronic Science and Technology of China

    China

    Homepage

Zhenyu Guo,

    Dr. Zhenyu Guo

    School of Electronic Engineering

    University of Electronic Science and Technology of China

    China

    Homepage

Tao Yang

    Dr. Tao Yang

    School of Electronic Engineering

    University of Electronic Science and Technology of China

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 63, 123-128, 2016
doi:10.2528/PIERL16092802 | Google Scholar

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.
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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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