Minimizing the impact of ground reflection on high power microwave E-field measurement

This paper presents a new measuring method of minimizing the impact of ground reflection on the microwave electronic field measurement using double antenna array. The character of ground reflection is studied using the electromagnetic geometric optics theory and the electromagnetic wave propagation formula in layered media. Then a theoretical formula for computing the oscillating period of ground scattering pattern is derived. The impact of ground reflection on the transversal field and vertical field is simulated using the FDTD method, and the effect of minimizing the ground reflection with double antenna array is also validated by simulation, it shows that the impact of ground reflection is decreased from 4 dB to less than 0.6 dB, which improves the accuracy of the high power microwave radiation field measurement.