Electromagnetic Band Gap (EBG) Structure

Nik Nabihah , Nik Musa (2009) Electromagnetic Band Gap (EBG) Structure. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In antenna design, there are surface waves that cannot propagate along the substrate. An increase amount of radiated power couples to space waves reducing antenna losses while increasing its gain and bandwidth. The Electromagnetic Band Gap (EBG) structures are periodic structures in which propagation of electromagnetic waves is not allowed in a specified frequency band. In this project, EBG structure had been designed in order to apply in antenna design to suppress surfaces waves and improve the radiation performance of the antenna. In designing EBG structure, the method had been used is finite difference time domain (FDTD). This EBG is designed by using microstrip. Then, the simulation process is done by using Computer Simulation Technology (CST). The purpose to simulate the design is to analyze antenna parameters, such as return loss, gain, radiation pattern and others. Various types and shapes of EBG structures had been designed such as circular, square and triangular EBG structures. Each shape is designed in two different conditions, such as EBG structures on same and different layer with microstrip patch antenna. From these designs, five EBG structures circuits were fabricated with different layer with microstrip patch antenna. Simulations and measurements show that EBG structure can achieve the lower return loss (<-10dB) compared to a microstrip without EBG structure.

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