A Tunable low Pass Filter Based on Transmission Lines With Tunable Input/Output Impedance

Zhonghai Zhang, Yuekai Zhao, Lin Chen, Zhihua Fang, Aiting Wu, Pengquan Zhang
2022 Frontiers in Physics  
A tunable low pass filter (TLPF) based on the tuning of input/output impedance was presented in this letter. The TLPF mainly consisted of improved quarter-wavelength stubs. The input/output impedance of the improved quarter-wavelength stubs can be tuned in a certain range. The design procedure of this TLPF was derived from the filters based on the quarter-wavelength transmission stubs. Through the tuning of the input/output impedance of the transmission lines, the cut-off frequency of the TLPF
more » ... an be adjusted in a certain range. The TLPF has relatively good designability and can be easily changed to meet other performance levels. Finally, a TLPF was designed, fabricated, and measured. The measured results verify the effectiveness of the design method.
doi:10.3389/fphy.2022.872204 doaj:c4c2e586694241959930f73fdf23c31c fatcat:r2jp4vwrofcupagqdwx3ozaq7e