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工作于自由空间的薄膜电阻屏在高于临界频率 f_c 时,在很宽的频率范围内,其有效截面积为一个常数;在低于 f_c 时,有效截面近似地随每频程12分贝的变化率而减少。电性能的等效屏呈薄膜格或栅的形式,其作用是按所吸收的辐射成正比地产生直流输出电压。可以设计探头直径为1吋的实际截面,吸收率为15～20%。这样,从低于200兆赫一直到毫米波段之内都能工作。
A thin film resistive screen operating in free space above a critical frequency f_c has a constant effective cross-sectional area over a wide range of frequencies, and below about f_c the effective cross-section approximately varies with 12 dB per frequency Rate reduced. Equivalent electrical properties of the screen in the form of thin film grid or grid, its role is to absorb the radiation generated in direct proportion to the DC output voltage. It is possible to design an actual section with a probe diameter of 1 inch with an absorptivity of 15 to 20%. In this way, it can work from below 200 MHz up to the millimeter band.