宽带双极化探头阵列的设计

Design of the broadband dual-polarized probe array

近场测量系统中,用探头阵列代替单探头能大量减少天线的测量时间.设计了一种由4个双极化印刷振子组成的宽频带直线阵列,由两个单线极化印刷振子垂直交叉组成的双极化印刷振子作为阵列单元,再将4个双极化印刷振子天线排成直线阵列,提高了阵列单元间的隔离度.实测结果表明,阵列中相同和不同极化方式的单元间隔离度大,达到-20 dB,单元间的互耦较小,相对带宽73.2%,说明该方法是正确可行的.

The probe arrays of the near-field measurement system is studied theoretically and experimentally. A dual-polarized linear array which consists of four dual-polarized printed dipoles is designed. First a dual-polarized printed dipole is designed as the unit of the array, which is composed of two vertical single polarized printed dipoles. Then a straight line array is composed of four dual polarized printed dipole antennas. The mutual couplings between array elements is analyzed. The isolation between the units is improved. Finally, the antenna array is measured actually. Measured results show that in a broader band, the isolations between the elements of the array are big while the mutual couplings between array elements are small, which indicates the validity of this method.