Title :
Compact lowpass filter with wide stop-band using coupled-line hairpin unit
Author :
Wei, F. ; Chen, Luo-nan ; Shi, Xiao-Wei ; Huang, Q.-L. ; Wang, Xiang-Hua
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi´an, China
Abstract :
A novel transmission line configuration is proposed to design a lowpass filter (LPF) with sharp cutoff frequency response and wide rejection bandwidth. The proposed LPF is realised by a cascading microstrip coupled-line hairpin unit, semi-circle defected ground structures and semi-circle stepped-impedance shunt stubs. Theoretical and simulated results are presented, which are in good agreement with measured results.
Keywords :
UHF filters; coupled transmission lines; equivalent circuits; frequency response; low-pass filters; microstrip couplers; microstrip filters; microstrip lines; cascading microstrip coupled-line hairpin unit; compact lowpass filter; cutoff frequency response; equivalent-circuit model; semi-circle defected ground structures; semi-circle stepped-impedance shunt stubs; transmission line configuration; wide rejection bandwidth; wide stop-band;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2411
