Abstract
This paper presents a design of a multiband microstrip circular patch antenna. The antenna of a single patch is designed for the operation at 2.45 GHz and 5.2 GHz ISM (industrial, scientific, and medical) band. This band is occupied by the bluetooth and high performance radio local area network (HIPERLAN) applications. In addition, with the aid of a circular array, the previous antenna can be designed to operate in a place of x band (8.4 GHZ) used by the spacecraft-to-ground communication link. The return loss, input impedance, and the radiation pattern are calculated. Under the condition of the return loss is less than 10dB, the bandwidth at 2.45, 5.2 and 8.4 GHz are 24 %, 7.7%, and 6.7%, respectively. The analysis and design of the antenna is carried out using of the finite difference time domain (FDTD) with the perfect matched layer (PML) in addition to a numerical package based on the method of moment (MOM). The obtained results are compared with the available published data and the results of the cavity resonance technique. Good agreements are found.
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