Design of Water Dielectric Patch Antenna

Abstract

Dielectric antenna is a new topic in the antenna world because there are many possibilities of material choosing to achieve different characteristics such as transparent, compact and flexible. This project is to design a compact dielectric water patch antenna. Although there are already some research designs published, there are relatively big in size. In order to solve this problem, this project is going to investigate the behaviour of using transparent plastic (dielectric constant of plastic is around 3) as the substrate and other design technique to reduce the size of a dielectric antenna. The dimension of the cylindrical water antenna is 64mm(diameter) x 22mm(height) in which the radiating patch and ground are made of distilled water and the substrate is made of plastic. The antenna is feed by a small metallic disk load connected to a probe and coaxial cable. The operating frequency of the antenna is around 2.17 GHz to 2.48 GHz. The size of radiating patch has achieved (0.83*wavelength) which is compact. The impedance bandwidth is 13.33% for |S11| < -10dB. The radiation pattern of the antenna is omnidirectional. Because of the reduced size and transparent outlook, the water antenna is able to implement to many wearable electronic devices or even human communication. Finally, this report will discuss the drawback and suggest the future improvement of this kind of dielectric antenna.