Artificial Magnetic Conductor Frame to Improve Impedance Matching and Radiation Symmetry in 2$\times$2 Array for 6G Applications
This work addresses performance improvements in antenna arrays for 6G communication systems, representing an incremental advancement by enhancing existing designs without modifying the radiating elements.
The paper tackled the problem of impedance matching and radiation symmetry in a 2x2 antenna array for 6G applications by proposing an Artificial Magnetic Conductor (AMC) frame, resulting in a bandwidth of 1.5 GHz at 28 GHz, isolation under -15 dB, gain of 11.81 dBi, and aperture efficiency of 69%.
An Artificial Magnetic Conductor (AMC) frame capable of improving the impedance matching of a 2$\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.