Title :
A low-pass filter by using a meandered slot
Author :
Yu-Wei Cheng ; Jhong-Wei Wu ; Tz-Hsiung Lin ; Chien-Jen Wang
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Tainan, Tainan, Taiwan
Abstract :
A new low-pass filter (LPF) with a wide stopband has been presented in this study. The proposed filter is based on a defected ground structure (DGS), including a modified-meandered slot, a spurred C-like slot, and a microstrip transmission line with a 50 Ω. Two rectangular-headed slots are etched at terminals of the meandered slot, thus giving increase of the inductance and then the purposed frequency reduction. To improve rejection capability, the width of the meandered-slot resonator is also widened. An arm aperture is embedded to create new resonant path; in addition, a C-like slot with a spur slit is embedded inside the meandered slot so that the filter not only creates two transmission zeros in the stopband, but also exhibits a wide upper stopband. The filter possesses a measured minimum insertion loss of 0.7 dB over the passband and a wide stopband with rejection better than -20 dB from 2.9 to 12.0 GHz.
Keywords :
UHF filters; band-stop filters; defected ground structures; inductance; losses; low-pass filters; microstrip resonators; microwave filters; transmission lines; DGS; LPF; arm aperture; defected ground structure; frequency 2.9 GHz to 12.0 GHz; frequency reduction; inductance; loss 0.7 dB; low-pass filter; microstrip transmission line; minimum insertion loss; modified-meandered slot resonator; rectangular-headed slots; rejection capability improvement; resistance 50 ohm; resonant path; spur slit; spurred C-like slot; transmission zeros; wide upper stopband; defected ground structure; meandered slot; transmission zero;
Conference_Titel :
Electromagnetics (iWEM), 2014 IEEE International Workshop on
Conference_Location :
Sapporo
DOI :
10.1109/iWEM.2014.6963699
