Simulated near-field gain and E-field intensity of insulated loop antenna in the liquid at 30 MHz

As a reference antenna operated in the tissue-equivalent liquid at 30 MHz, where the wireless communication devices are used in Japan, an insulated circular loop antenna is useful for calibrating the electric field probe for evaluating the SAR (Specific Absorption Rate) of the devices. Its near-field gain and electric field intensity are numerically simulated by the mothods of moment so that the probe can be calibrated by our formulation. Moreover, if the size of the insulated circular loop antenna is well selected, the near-field gain is approximately coincident with the far-field gain extremely in the neighborhood of the antenna and the behavior of the electric field intensity in the extremely near-field region becomes the same as that in the far-field region.