Simulation and Analysis of a Microstrip Circular Array Antenna at 15GHz

This paper simulates and analyzes a microstrip patch circular array antenna at 15 GHz. The element of the circular array is the rectangular microstrip patch and each element is fed by a coaxial line. The size and feed position of the microstrip patch are determined through the theoretical design and software simulation. Based on the designed microstrip patch antenna element, a circular array with 20 elements is composed. In virtue of the coupling among the elements, the size of the element is changed and the voltage standing wave ratio (VSWR) of each element in the circular array and the radiation pattern are calculated. When the excitation magnitude and phase of all the elements are the same, the gain of the designed circular array antenna at 15 GHz reaches about 21 dB and the VSWR of each element is less than 1.8. The simulation results in this paper can provide a design reference for the practical design of circular array antennas.