Electromagnetic Field Distribution of a Wire-rhombic Antenna for Immunity Testing of Large Telecommunication Equipment

Radio-frequency immunity testing equipment which can irradiate large equipment with both vertical and horizontal electric field at low frequencies which uses wire-rhombic antenna is described. The relationship between antenna size and electric field distribution is analyzed using static electric field approximation. An antenna that is 12.0m long, 4.5m wide and 3.5m high is constructed in a semi-anechoic chamber, and the electric field distribution is measured. The results show that the deviation between calculated and measured value is within 1dB for the vertical electric field and within 3dB for the horizontal field. The field strength of 10V/m is obtained when the antenna is fed with about 8W of power for the vertical field and 250W, for the horizontal field.
International Symposium on Antennas and Propagation (ISAP1992), September 22-25, 1992, Sapporo, Japan