CSRRS for Efficient Reduction of the Electromagnetic Interferences and Mutual Coupling in Microstrip Circuits

Abstract

Abstract-This paper proposes an efficient microstrip isolator filter 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 flipped 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 flipped array of CSRRs presents wider bandgap characteristic (stopband ≥ 20%) than periodic array of CSRRs (∼ 16%) and conventional array of SRRs (≥ 12%). Then, the metamaterial filter is inserted between two 6.1 GHz probe-fed patch antenna elements separated by a distance of 0.8λ 0 . Excellent agreements between the simulated and the experimental results are obtained. In fact, a significant reduction of the EM mutual coupling is achieved, more than 24 dB, 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.

Experimental Study of the Behavior of an Ebg-Based Patch Antenna Subjected to Mechanical Deformations

“…Then, the antenna radiating elements have to be closer from each other and thus, reducing their mutual coupling arises from such a design constraint. A solution can consist in using metamaterial structures to reduce electromagnetic interactions between the antenna radiating elements, such as EBG structures [1][2][3][4][5][6], Complementary Split Ring Resonator (CSRR) structures [7,9] and/or the planar MTM surfaces [8].…”

“…In this kind of new multi-frequencies antennas, some radiating elements might be close to each other, and an unwanted coupling effects might arise if there is not a suitable distance separating two successive radiating elements. These undesired coupling can be reduced using metamaterial (MTM) structures, such as EBG structures [1][2][3][4][5][6] and/or planar MTM surfaces such as Complementary Split Ring Resonator (CSRR) structures [7][8][9]. Commonly, this kind of EBG (electromagnetic bandgap) structures is used for planar antennal structures but is not optimally designed when deformed due to mechanical loads (except the theoretically study of [4]).…”

Isolation Improvement between Closely Spaced Microstrip Loop Antennas using Metamaterial Structure

“…The isolation parameter (S 12 ) is around -19db for closely spaced antenna that are not separated using metamaterial structures. [6] The S parameters are noted in the form of a table and then compared with the results of the fabricated one after testing.…”

Compact Waveguided Metamaterials for Suppression of Mutual Coupling in Microstrip Array

“…In order to study the scattering properties (reflection coefficient S 11 , and transmission coefficient S 21 ), a quasi-transverse electromagnetic (TEM) waveguide setup was implemented in the commercially available EM solver HFSS 14 [13,14] as depicted in Figure 1. Appropriate perfect electric conductor (PEC) and perfect magnetic conductor (PMC) boundaries were imposed in the z and x directions, respectively, to propagate the dominant TEM plane wave along y direction, with the electric field polarized perpendicular to, and the magnetic field parallel to, the periodical WG-MTMs.…”

“…WG-MTM with crossed meander line slits has been designed which exhibits magnetic resonances [12]. Hilbert-shaped WG-MTM has been introduced to reduce the mutual coupling of closely packed elements [13]. In both structures, edge-to-edge element spacing was kept at 0.125λ 0 , but reduced coupling was achieved only in H-plane elements.…”