A meander shaped defected ground structure (DGS) for reduction of mutual coupling between microstrip antennas

Abstract

In this paper, a compact meander shaped defected ground structure (DGS) is applied to reduce the mutual coupling between elements of microstrip antenna array with 0.5 λ0 elements spacing. The proposed antenna array consists of two elements. Four meander shaped slots in the ground plane are used between elements to reduce the coupling between the array elements. The antenna is simulated using CST microwave studio software, fabricated on FR4 substrate with dielectric constant of 4.3 and thickness of 1.6 mm by etching the ground plane of the microstrip antenna and measured. The results show that a reduction in mutual coupling from -23 dB to -52 dB is obtained between elements at the operation frequency of the antenna array. The gain is increased by 0.6 dBi. A small shift in operating frequency from 4.74 to 4.8 GHz is introduced The measurement results prove the high efficiency of this configuration.

Reduction of Mutual Coupling between Closely Spaced Microstrip Antennas Arrays Using Electromagnetic Band-gap (2D-EBG) Structures

“…A simple UC-EBG structures presented in [5], are printed on a superstrate layer to miniaturize the distance between the elements of antennas arrays and reduce the mutual coupling. Also, these periodic [19], with significant reduction in mutual coupling by 29dB at the operation frequency of the array.…”

SRR Inspired Microstrip Patch Antenna Array

“…However, various strategies have been applied to reduce the same. Some of the most common methods are moving the antennas with different orientations around the printed circuit board [3,4], use of defected ground structures [5,6], insertion of slots [7], electromagnetic band-gap structures [8][9][10], parasitic elements between the antennas [11], tilting the patch elements along the elevation [12], etc. As discussed in [3,4], best isolation is achieved when the antennas are spaced by the largest available distance on the PCB, but it results in increased size.…”

“…As discussed in [3,4], best isolation is achieved when the antennas are spaced by the largest available distance on the PCB, but it results in increased size. In [5], Ismaiel et al used meander shaped defective ground structure to reduce the mutual coupling. This method efficiently reduces the mutual coupling, but also distorts the radiation pattern to some extent.…”