Calculation ruler for quickly calculating free space attenuation of electromagnetic waves

The invention discloses a calculation ruler for quickly calculating free space attenuation of electromagnetic waves, and belongs to the technical field of metering equipment. The calculation ruler comprises a base, a distance graduated scale fixedly arranged on the base, a transparent reading plate fixedly arranged on the distance graduated scale, and a frequency graduated scale and a attenuationvalue graduated scale which are movably arranged on the base, wherein the frequency graduated scale and the attenuation value graduated scale are in linkage sliding, and a frequency pointer is arranged on the transparent reading plate. According to the calculation ruler, the attenuation value of the signal can be quickly calculated, and the effectiveness of electronic warfare is met. 本发明公开了一种快速计算电磁波自由空间衰减的计算尺，属于计量设备技术领域，其包括底座，固定设置在所述底座上的距离刻度尺，固定设置在所述距离刻度尺上的透明读数板，以及活动设置在所述底座上的频率刻度尺和衰减值刻度尺，所述频率刻度尺与所述衰减值刻度尺联动滑动，所述透明读数板上设有频率指针。本发明能够快速计算出信号的衰减值，满足电子战的实效性。