Analysis of electromagnetic band gap structure for isolation improvement of microstrip patch antennas

Microstrip patch antenna arrays are widely used in wireless communication applications. Mutual coupling between antenna elements affects the array performance and reduction of the coupling and improvement of the isolation are important tasks for an array system. In this thesis, some compact, metamaterial-inspired electromagnetic band gap (EBG) structures are proposed, which are different forms of the split rectangular loops. The reduction of both the mutual coupling effect and surface waves, thereby the isolation of the elements in a two-element array of microstrip antennas is achieved with the EBGs placed between antennas. This EBG is an alternative to the existing EBGs used in various applications. The proposed antenna systems are simulated by FEKO and CST softwares and simulation results show that designed EBGs can increase the bandwidth of the antenna while suppressing the coupling between antenna elements.