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设计了一种工作于Ka波段的、用于近距离散射测量的四单元紧凑型阵列天线,在阵列近场实现了较均匀的幅相分布.辐射单元由角锥喇叭天线和E面金属板透镜天线组成.馈电网络由魔T、弯波导组成,为各辐射单元提供等幅同相馈电.采用阵列形式和采用透镜调节喇叭口面相位,都较大程度地减小了阵列的纵向尺寸,且电性能也有明显改善.给出了阵列天线近场的测试结果,并对测试结果进行了分析.在距离阵列口面0.5 m处,在与阵列宽度相同的范围内,幅度和相位波动分别在±2.5 dB和±25°左右.
A four-element compact array antenna for Ka range and near-field scattering measurement was designed to achieve a more uniform amplitude and phase distribution in the near field of the array.The radiating element consists of a pyramid horn antenna and an E-face metal plate lens Antenna composed of magic T, curved waveguide composed of radiation units for the same amplitude of the same phase feed.Using the array form and the use of the lens to adjust the horn face phase, to a large extent reduce the vertical size of the array, And the electrical performance has also been significantly improved.The test results of array antenna in near field are given and the test results are analyzed.When the distance to the array mouth is 0.5 m, amplitude and phase fluctuation in the same range of the array width are ± 2.5 dB and ± 25 °.