Accurate design of circularly polarized microstrip array antenna using multiport network model

Microstrip patch antennas (MPAs) with circular polarization are used in many communication and radar systems. There are several methods and models in order to analyze and design these antennas including multiport network model (MNM). This model includes several circuit networks, that are connected to each other and each of them represents one characteristic of the MPA. Solution of this model is equivalent to calculation of the input and radiation parameters of the antenna. In this paper, a circularly polarized 2×2 array microstrip antenna with sequentially rotated elements is designed using the MNM.