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当波导内放了一些介质,或存在其他不均匀性时,为了便于对波导内的电磁场进行分析,常常需要测量其分布.关于矩形波导内横电场的分布,目前都是采用探针法进行测量的,即在波导宽面上开一横向槽,将一探针沿此槽逐点移动而测得.这个方法虽还可靠,但横向槽切断了面上的纵向电流,对波导内的场必有较大扰动,槽的辐射、探针的扰动等也都会引起测量误差,而且,其结构也较复杂.
When some media is placed in the waveguide or there are other inhomogeneities, it is often necessary to measure its distribution in order to facilitate the analysis of the electromagnetic field within the waveguide. With regard to the distribution of the transverse electric field within the rectangular waveguide, the probe method is currently used , That is to say, a transverse groove is formed on the broad face of the waveguide, and a probe is moved point by point along the groove to be measured. Although this method is also reliable, the transverse groove cuts off the longitudinal current in the face and the field inside the waveguide Larger disturbances, slot radiation, probe disturbances, etc., can also cause measurement errors, and their structure is more complex.