Isolation enhancement of 5G multiple‐input multiple‐output microstrip patch antenna using metamaterials and the theory of characteristic modes

Abstract

This paper presents a compact 5G multiple-input multiple-output (MIMO) microstrip antenna with isolation enhancement based on a slotted complementary split-ring resonator (SCSRR) and the theory of characteristic modes (TCMs). The metamaterial unit consists of three CSRR connected by extra slots. These added slots improve significantly the rejection response in terms of bandwidth and suppression. The dispersion diagram analysis is introduced to show the filtering characteristics of the band-gap structure before and after adding these additional slots. The TCM is employed to investigate the behavior of this 5G MIMO antenna before and after adding the slotted CSRR. The TCM is also applied to the MIMO antenna system to build up a precise methodology that can foresee whether the isolation can be upgraded further or not. The slotted CSRR is inserted meticulously in specific locations to block the coupling modes and almost does not affect the results of the noncoupling modes to improve the isolation remarkably. With this slotted CSRR, a 27-dB reduction in the mutual coupling between the two patch antennas is achieved. The whole design has been simulated utilizing the Microwave Studio CST ver. 18 simulator. The antenna being proposed is highly efficient and suitable for 5G wireless communication.

Design of high gain Vivaldi antenna with a compound optical lens inspired by metamaterials

“…With the development of metamaterials, it has been widely and rapidly applied to various fields. Loading metamaterials on the antenna becomes a simple and effective method to improve antenna performance 20‐22 . In Reference 23, loading metamaterial onto a simple AVA effectively enhances the gain of the antenna without changing the other properties of the antenna.…”

“…Loading metamaterials on the antenna becomes a simple and effective method to improve antenna performance. [20][21][22] In Reference 23, loading metamaterial onto a simple AVA effectively enhances the gain of the antenna without changing the other properties of the antenna. In Reference 24, the authors achieve the guidance of electromagnetic waves by loading metamaterial plates above and below the antenna, thereby enhancing the directivity and gain of the antenna.…”

Metamaterial-Inspired Antennas: A Review of the State of the Art and Future Design Challenges

“…For the decoupling, they utilized a 2 x 3 array of modified CSRRs (called CSR2) that exhibit a bandgap in the corresponding frequencies and thus resulted in coupling reduction in both bands. Excellent decoupling at the 28GHz 5G band was reported in [109]. Three CSRRs connected with extra slots were inserted between the elements and adequately decreased the coupling by 27dB.…”

A single‐feed circularly polarized loop antenna using characteristic mode analysis

“…Nowadays, CMA is a precise and unique technique that provides an understandable and insightful electromagnetic radiation mechanism to design and optimize antennas. For instance, harmonic suppressed stepped impedance strip dipole antenna was studied with CMA in Reference 13, a broadband dual CP shared‐aperture antenna array was designed using CMA for 5G applications in Reference 14, multi‐band multi‐input multi‐output antennas were researched with CMA in References 15‐17. It is worth mentioning that CMA is independent of excitation, and the analytical results depend on the radiation elements entirely.…”