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(一)引言 串馈波导窄边缝隙阵天线是一种广泛应用的天线。波导缝隙电导与缝隙几何尺寸的关系是设计这种天线的基础,而缝隙导纳的频率特性则是分析天线频率特性所必不可少的依据。设计波导缝隙阵天线,虽有理论分析公式可以应用,但所得结果与实际情况还有出入;因此,设计之前,先测得波导缝隙的电导值。由于单个缝隙的电导值相当小,难以测准,加之缝隙之间又存在相互耦合,因此,人们都是测量多个(至少20个)缝隙的阵中的缝隙电导值。一般是采用测量S参量的方法,即测量波节点的移动,通过作图求得电导值。这种测量方法非常繁琐,而且精度也难保证。也有人采用行波功率法,但只能得到谐振频率上的电导值。至今尚未见到关于测量缝隙导纳的频率特性的简捷方
(A) Introduction The narrow-slot slot array antenna is a widely used antenna. The relationship between the waveguide slot conductance and the slot geometry is the basis for designing this antenna, and the frequency characteristics of the slot admittance are essential for analyzing the antenna’s frequency characteristics. Design waveguide slot array antenna, although the theoretical analysis formula can be applied, but the results are still different from the actual situation; Therefore, before the design, first measured conductivity of the waveguide gap. Because of the relatively small conductance of a single gap, which is difficult to calibrate, and the mutual coupling of the gaps, one is measuring the gap conductance in a matrix of multiple (at least 20) slits. In general, the method of measuring the S-parameter is used to measure the movement of the node of the wave and obtain the conductance value by plotting. This measurement method is very tedious, and the accuracy is difficult to guarantee. Some people use traveling wave power method, but can only get the resonant frequency of the conductance value. To date no simple way to measure the frequency characteristics of slot admittance has been found