CST – Computer Simulation Technology

Design and Analysis of Concentric Reflectarray Element
Siti Hafizah Yusop, Norbahiah Misran, Mohammad Tariqul Islam, Muhammad Yusof Ismail
1st January 0001
In some wireless communication systems like satellite communication due to the long distance between the transmitter and the receiver high gain antennas are required. Parabolic reflector antenna is a conventional candidate for high gain radiation patterns. However, it is bulky in size and large in mass which makes it unsuitable for the applications like satellite communication. Microstrip reflectarray antennas are good alternatives for parabolic reflector antenna due to their lightness and small size. A reflectarray antenna consists of a reflecting surface and a feed antenna which illuminates the reflecting surface. The reflecting surface is a two dimensional array of radiating elements. The principle of reflectarray antennas using the waveguide technology was first introduced by Berry [1]. Emerging the printed circuit technology and consequently microstrip antennas paved the way for developing microstrip version of reflectarrays [2]. There are three approaches for designing a reflectarray. In the first approach, identical patch elements with different-length stubs are used for obtaining the phase difference required for designing the reflectarray [3, 4]. The second method makes use of the elements with different dimensions to provide the desired phase difference [5–7]. In the third method, for circular polarization only, the circularly polarized elements are all identical, but with different angular rotations. In this paper the second approach mentioned above is employed to design a reflectarray made of microstrip concentric ring square elements. The reflection phase of the element versus the size element is obtained by using the CST Microstripes software. The design of the element is simulated in CST Microstripes and also measured. The simulation of reflection phase versus size element shows good agreement with the measurement.

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