CSRR Based Compact S-Shaped Dual-Planar Electromagnetic Bandgap Microstrip Low-Pass Filter

Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ABSTRACT: In this paper, a new topology for the design of a highly compact complementary split-ring resonator (CSRR) based dual planar electromagnetic bandgap (DP-EBG) microstrip low-pass filter with a S-shaped geometry is proposed. With the DP-EBG configuration and the S-shaped geometry of microstrip line (MLIN), the proposed structure achieves a very sharp stopband with high attenuation and high selectivity within a very small circuit area. Its passband ripple level is negligible due to the square patch inserted in the MLIN and CSRR in the ground plane of S-shaped geometry. By introducing complementary split-ring resonator (CSRR), the selectivity and the roll-off of the microwave low-pass filter is highly improved. The proposed structure is very simple and easy to fabricate and is highly compatible with monolithic microwave integrated circuit (MMIC) technology