For the requirements of over-the-horizon communication,target monitoring,and other functions by modern fighter jet,a high-gain circularly polarized Yagi array antenna is designed.The basic structure of the antenna unit is to have two microstrip quasi-Yagi antennas placed orthogonally to form circular polarization.A 2×2 antenna array is built to increase the left and right rotation gains of the antennas.At the same time,a feeding network with left-handed circular polarization and right-handed circular polarization ports is designed for the array antennas.Finite element meth-od and moment method software are used to simulate and optimize the designed antenna and the feeding network,to obtain the antenna parameters and to process and test the designed antenna.The test results show that the impedance bandwidth of the designed antenna reaches 400 MHz(2.08～2.48 GHz),and the relative bandwidth reaches 17％.The maximum left-handed and right-handed gain of the antenna reaches 14 dBi,and the 3 dB beamwidth is greater than 34°,which meets the design requirements and can be used for over-the-horizon monitoring system.
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