Estimation of the EMP response of a system from its continuous wave measurement results

Traditionally, the electromagnetic protection ability of a system, such as filters, shielding enclosures, etc., is measured in the frequency-domain and expressed as insertion loss or shielding effectiveness. When the time-domain characteristics of the system are required to evaluate their pulse response, time-domain tests need to be conducted. However, it may not be convenient to carried out time-domain tests because of the availability of test facilities. Theoretically, suppose the system works in a linear range, its pulse response can be estimated from frequency-domain measured data. We evaluated this concept by experiments. A digital filter model of the system under test is used to approximate the measured frequency response and then employed to calculate the output of the system under pulsed input. The estimated pulse responses are compared with measured ones. Results show that it is possible to estimate approximately the magnitude and shape of the time-domain response by this approach.