Interaction Between Closely Packed Array Antenna Elements Using Meta‐Surface for Applications Such as MIMO Systems and Synthetic Aperture Radars

Abstract

The paper presents a technique to enhance the isolation between adjacent radiating elements that is common in densely packed antenna arrays. Such antennas provide frequency beam‐scanning capability needed in multiple‐input multiple‐output (MIMO) systems and synthetic aperture radars. The method proposed here uses a metamaterial decoupling slab (MTM‐DS), which is located between radiating elements, to suppress mutual coupling between the elements that would otherwise degrade the antenna efficiency and performance in both the transmit and receive mode. The proposed MTM‐DS consists of mirror imaged E‐shaped slits engraved on a microstrip patch with inductive stub. Measured results confirm over 9–11 GHz with no MTM‐DS the average isolation (S12) is −27 dB; however, with MTM‐DS the average isolation improves to −38 dB. With this technique the separation between the radiating element can be reduced to 0.66λ0, where λ0 is free space wavelength at 10 GHz. In addition, with this technique there is 15% improvement in operating bandwidth. At frequencies of high impedance match of 9.95 and 10.63 GHz the gain is 4.52 and 5.40 dBi, respectively. Furthermore, the technique eliminates poor front‐to‐back ratio encountered in other decoupling methods. MTM‐DS is also relatively simple to implement. Assuming adequate space is available between adjacent radiators the MTM‐DS can be fixed retrospectively on existing antenna arrays, which makes the proposed method versatile.

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“…The radiation efficiency of the novel UWB-MIMO antenna reaches 90.38%, and the gain at the center of the main lobe is 5.7 dB. Compared with other research works [23][24][25], with left-and right-handed composite structures, it is easier to implement flexible control. There are different isolation effects for different numbers of array elements.…”

Application of metamaterials for performance enhancement of planar antennas: A review

“…In this respect, metasurfaces have been one of the techniques for suppressing mutual coupling between multiple antenna elements. [12][13][14][15]…”

“…Mutual coupling induced by the surface current along the substrate and spatial electromagnetic fields, however, deteriorates the antenna radiation characteristics, and this is one of the major problems for antenna designers. In this respect, metasurfaces have been one of the techniques for suppressing mutual coupling between multiple antenna elements …”

Design of SWB MIMO Antenna with Extremely Wideband Isolation

“…All these techniques have been employed to reduce coupling in the range 3.1 GHz-10.6 GHz. Further, mutual coupling reduced by metamaterial in [30][31][32][33][34][35][36][37][38][39] and [40][41][42][43]. Most of these antennas possess large dimensions, have low isolation enhancement and low %BW and gain.…”