Research of electric-field strength measurement based on a top-loaded antenna in the near field

For measuring the electric-field intensity in the near field, the characteristics of the top-loaded short dipole antenna is studied theoretically in this paper and applied to an electric field measurement system. The antenna impedance characteristics and orientation map is analyzed using electromagnetic simulation software and the electricity-short antenna input impedance is measured with the help of network analyzer. The designation operational amplifier is studied for antenna-to-receiver match and the sensitivity of the measurement system is increased. The validity of the measurement of electric-field strength in the near field is detected by measuring the electric field of a parallel-plate capacitor.