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

publication date

  • October 2018

start page

  • 1368

end page

  • 1381

issue

  • 11

volume

  • 53

International Standard Serial Number (ISSN)

  • 0048-6604

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 0.66¿0, where ¿0 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. ©2018. American Geophysical Union. All Rights Reserved.

keywords

  • antenna arrays frequency beam scanning metamaterial decoupling slab (mtm-ds) multiple-input multiple-output (mimo) systems synthetic aperture radars antenna arrays codes (symbols) feedback control impedance matching (electric) metamaterial antennas metamaterials microwave antennas mimo radar radar antennas scanning antennas space-based radar synthetic aperture radar synthetic apertures telecommunication repeaters antenna efficiency beam scanning beam scanning capabilities decoupling methods free-space wavelengths front to back ratio operating bandwidth radiating elements mimo systems