Compact Filtering Switch With Wide-Stopband Response

IEEE Access

Yan-Mei Xue¹  Xiu Yin Zhang¹  Jin-Xu Xu¹ 

[1] School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China;

关键词: RF switch;    bandpass responses;    wide-stopband;    lumped-element loaded resonator;    compact size;    high isolation;   

DOI  :  10.1109/ACCESS.2017.2768098

来源: DOAJ

【 摘 要 】

A compact filtering switch with wide-stopband responses is presented in this paper. The resonator is designed using microstrip transmission lines and lumped capacitors. It is utilized to shift up the second harmonic frequency for wide-stopband performance and miniaturize the circuit size. In the ON-state, the circuit is the same as the bandpass filter without signals passing through the p-i-n diode, which avoids additional loss introduced by p-i-n diode. Two transmission zeros are generated near the passband to enhance the skirt selectivity. In the off-state, the signals from port 1 to port 2 passing through different transmission path are cancelled out, resulting in high isolation. For demonstration, a filtering switch operating at 780 MHz is implemented with the compact size of 0.072λ_g×0.066λ_g. More than 20-dB suppression levels are measured from 0.89 to 5.3 GHz (6.8 f0), featuring wide-stopband responses.

【 授权许可】

Unknown