CSRRS FOR EFFICIENT REDUCTION OF THE ELECTROMAGNETIC INTERFERENCES AND MUTUAL COUPLING IN MICROSTRIP CIRCUITS

Abstract

This paper proposes an e-cient microstrip isolator fllter which suppresses the surface and lateral waves (SW and LW) in planar antenna arrays. The structure consists in a double or triple row of periodic and ∞ipped array of subwavelength Complementary Split Ring Resonators (CSRRs). The array of CSRRs is etched on a dielectric substrate backed by a metallic ground plane. These structures can both block the electromagnetic (EM) energy in one direction and guide it along the other transverse direction. In particular, the ∞ipped array of CSRRs presents wider bandgap characteristic (stopband ‚ 20%) than periodic array of CSRRs (» 16%) and conventional array of SRRs (‚ 12%). Then, the metamaterial fllter is inserted between two 6.1GHz probe-fed patch antenna elements separated by a distance of 0:8‚0. Excellent agreements between the simulated and the experimental results are obtained. In fact, a signiflcant reduction of the EM mutual coupling is achieved, more than 24dB, over a wide frequency bandwidth. Moreover, the proposed CSRR structures are compact, low complex and, as printed antennas, are very easy to manufacture. They have numerous applications in MIMO systems and directive phased arrays.