Title :
High-performance low-pass filter using complementary square split ring resonators defected ground structure
Author_Institution :
Electr. Eng. Dept., Umm Al-Qura Univ., Makkah, Saudi Arabia
Abstract :
In this study, a complementary square split ring resonator (CSSRR) using defected ground structure in microstrip line form is introduced. The CSSRR unit has interesting filtering characteristics, such as a very high attenuation rate, couple of the dimension-dependent finite attenuation poles and a very low-passband ripple level. Cascading CSSRR units with different dimensions has been used to design a high-performance low-pass filter (LPF) with a cutoff frequency (fc) of 1.80 GHz through a simple, straightforward design procedure. The designed LPF exhibits an attenuation rate of 300 dB/GHz and passband ripples of less than 0.30 dB. Moreover, it has a wide 20-dB stopband at up to 4.5 times fc with an attenuation of more than 30 dB in most of the stopband. To the authors knowledge, the overall performance of the LPF, particularly the attenuation rate, is the best among published reports to date. The designed filter has been fabricated and validated by measurements.
Keywords :
defected ground structures; low-pass filters; microstrip lines; resonator filters; complementary square split ring resonators; defected ground structure; dimension-dependent finite attenuation poles; frequency 1.80 GHz; high-performance low-pass filter; microstrip line form; very low-passband ripple level;
Journal_Title :
Microwaves, Antennas & Propagation, IET
DOI :
10.1049/iet-map.2010.0273