EBG antenna design

• Main Author: Ju, Chuang
• Other Authors: Lee Yee Hui
• Format: Final Year Project
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio
• Online Access: http://hdl.handle.net/10356/61219
• Institution: Nanyang Technological University

This project focuses on investigating the effects of mushroom-like EBG structure on the rectangular patch antennas. In this project, the resonant frequency is designed to be 2.4 GHZ. The mushroom-like EBG structure has been studied on its band gap characteristics as well as the different effects played by its different elements. The simple rectangular patch antennas have been investigated the effects of its length and width on the resonant frequency as well as the thickness of the substrate on the bandwidth. It is found that the length of the radiating patch is the dominating parameter of adjusting the resonant frequency and increasing the thickness of the substrate can increase the bandwidth. Three main different configurations of rectangular patch antennas with mushroom-like EBG structures are discussed in this report; they are the single layer patch antenna with EBG structures, two-layer patch antenna with EBG structures and no EBG patches under the radiating patch and the two-layer patch antenna with EBG structures under the radiating patch. The first two exhibit the similar effects on the patch antenna which can suppress the surface waves and improve the gains. The last one is designed mainly for reducing the radiating patch size which can reduce the area of patch to less than 40% of the original. Besides, the reduced area of the radiating patch can be controlled by the distance between the radiating patch and EBG patches under it. That is an important observation. When it is needed to reduce the radiating patch size largely, it is needed to reduce the distance but with the performance decreasing. With this theory, according to the requirement, it can balance the performance and the reduction of the area of the radiating patch by choose a proper distance between the radiating patch and the EBG patches under it.