Surface wave suppression in patch arrays using EBG structures

Mutual Coupling in Patch arrays is an important parameter to be considered in modern antenna technology. Electromagnetic Band Gap (EBG) method is a major technique utilized in the Radio Frequency and microwave applications because of its exclusive band gap characteristics at a desired frequency. This paper provides a comprehensive review of different EBG structures used in the literature survey and analyzes the performance of the patch array using square and circular EBG between two patches. MC mainly arises when the surface currents on the patch antennas are excited, whenever the substrate ε
r
> 1. These waves can be reduced by introducing EBG materials between patches on the substrate. By introducing these structures into the patch array various parameters like gain, bandwidth, directivity, radiation mechanism, current distribution in an antenna can be modified based on the user requirements. In this paper, different structures like square EBG with 6.3mm × 6.3mm and circular EBG with radius 3.15mm are investigated at UWB frequency range.