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在液氦温度下，研究了工作频率为6．26GHz的Y系超导圆极化微带天线的传输系数S21及圆极化轴比随外加工磁场的变化．实验结果表明：在4．2K温度，外加磁场B≤1T时，其S21及圆极化轴比基本不随外加磁场的变化而改变．
Under liquid helium temperature, the transmission coefficient S21 and the circular polarization axis ratio of Y-type superconducting circularly polarized microstrip antenna with operating frequency of 6.26GHz were studied with the change of external magnetic field. The experimental results show that the S21 and circularly polarized axial ratio do not change with the change of applied magnetic field at 4.2K and B <1T.