Abstract：A microstrip circularly polarized array antenna with low axial ratio was designed to decrease the measurement uncertainty caused by polarization mismatch. The 3dB beam width of the antenna was about 45°at 9.7GHz, the axial ratio was as low as 0.1dB at 9.7GHz. The antenna power capacity was greater than 1.5kW, and the axial ratio deviation was less than 0.1dB between temperature of 26℃ and -6℃. With this antenna, the uncertainty of polarization mismatch can be reduced to less than 0.1dB. It has strong environmental adaptability and it is suitable for accurate measurement of X-band airborne radiation field.
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2020, Vol. 41 
