Self-Isolated Multiple-Input-Multiple-Output Antenna for mm-Wave Applications

A low-cost innovative MIMO antenna configuration with minimal separation between the radiating elements and high isolation over a wide frequency band is presented. Several precisely designed slots with various forms, locations, and sizes are etched on the radiating patches to improve interelement isolation throughout the mm-wave band of 30-41 GHz impedance bandwidth. This achieved elements isolation better than 70 dB with an inter-element spacing of 0.2 mm (0.02. at 30 GHz). The suggested self-isolation method is validated by designing a 1x2 MIMO array configuration. The innovative mm-wave antenna has the following characteristics over the desired bandwidth: high impedance bandwidth ( 30%) and low mutual coupling ( 70 dB). To the authors' knowledge, the present design is the first to demonstrate such broadband isolation enhancement in the mm-wave frequency range without any sophisticated decoupling structure such as metamaterial or frequency-selective surface.

Automated summary

This study presents a low-cost innovative MIMO antenna configuration with minimal separation between the radiating elements and high isolation over a wide frequency band. The use of precisely designed slots on the radiating patches improves interelement isolation throughout the mm-wave band. The proposed self-isolation method achieves elements isolation better than 70 dB with a small inter-element spacing.