基于波导缝隙天线的TEM室频率扩展方法

为突破实际测试当中的局限，研究了横电磁波传输（TEM）室频率范围的扩展方法。运用电磁场与微波技术相关原理，通过分析TEM室壳体开缝对高次模的影响，利用壳体表面电流分布变化规律和波导缝隙天线原理重新解释了开缝对高次模的抑制作用，进而提出了一种TEM室壳体表面开缝的设计方法。通过电磁场数值仿真，验证了抑制高次模工程方法的有效性，并对其控制参数和约束条件的准确性进行了分析评估；通过加工实物并进行实测，进一步验证了新方法的效果。仿真与测试结果表明，开缝抑制高次模的工程方法能够在不减小测试空间与影响主模传输的前提下，将测试带宽扩展了42.9%。 

Frequency extension method of TEM cells based on slotted waveguide antenna

In order to break through limitatiions in actual testing,the extension method of frequency range of a transverse electromagnetic(TEM)cell is studied.Using the theory of electromagnetic field and microwave technology,the influence of adding slots to the cell on the higher order modes is analyzed,and the suppressing effect of slots on the higher order modes is reinterpreted by summarizing the variation of the distribution of sur-face current.According to the principle of slotted waveguide antenna,a new method has been proposed to de-sign the slotted surface of the TEM cell.Along with the numerical simulation of electromagnetic field,the pa-per validates the effectiveness of an engineering method to suppress higher order modes and evaluates the accu-racy of the control parameters and the constraint conditions.The effect of the new method is further verified by processing a real cell and its measurement.The simulation and test results show that,without reducing the test space and affecting the main mode,the engineering method of slotted cell can extend the bandwidth by 42.9% by suppressing higher order modes.