Artificial Magnetic Conductor Frame to Improve Impedance Matching and Radiation Symmetry in 2$\times$2 Array for 6G Applications

TL;DR

This paper introduces an AMC frame that enhances impedance matching and radiation symmetry in a 2x2 array for 6G, achieving broad bandwidth and high gain without modifying individual elements.

Contribution

The novel AMC frame improves array impedance matching and radiation performance without altering the radiating element design, using full-wave simulations for validation.

Findings

Achieves 1.5 GHz bandwidth at 28 GHz

Maintains isolation under -15 dB across the band

Provides a gain of 11.81 dBi with 69% aperture efficiency

Abstract

An Artificial Magnetic Conductor (AMC) frame capable of improving the impedance matching of a 2$\times$2 array for 6G applications without degrading isolation performance is presented. The proposed frame is integrated into the array without modifying the single radiating element design. By relying on accurate full-wave simulations, it results that the addition of the frame restores the impedance matching performance, achieving a bandwidth of 1.5 GHz at 28 GHz. The isolation between each port remains under -15 dB within the operating band, thanks to the vias in the rectangular patch metasurface. Moreover, the overall structure exhibits a gain of 11.81 dBi with an aperture efficiency of 69$\%$, satisfactorily for broadband communication purposes. The proposed AMC frame represents an effective method for improving array performance without the need to alter the shape or dimensions of the single radiating element.