Design of a Four-Port Phase Control Antenna for Ku-Band Wave Detection Radar System Using Magic-T Circuit Structure

Abstract

This paper proposes a design method for a four-port phase-controlled antenna for wave detection radar systems for preventing coastal erosion and accidents caused by rip current waves. The proposed antenna is a new phase-control technology that implements the magic-T circuit structure, enabling the adjustment of the beam patterns and phases of the patch antenna based on the position of the feeding ports.Utilizing the phase control and high isolation characteristics of the magic-T circuit structure, we designed 2×4 patch array antennas with four ports. The proposed antenna achieved excellent design results with reflection coefficients and isolation between each port measuring below −20 and −30 dB, respectively. Based on phase control using the magic-T circuit structure, the study confirmed that the antenna exhibited excellent characteristics, radiating beam patterns ranging from one to four beams depending on the excitation to each port.