Abstract
The authors work on a development of electromagnetic energy harvesting in the neighborhood of a transmitting antenna for an AM radio broadcasting. The locations of rectennas are one of an important issue for efficient operation of this technology. This paper treats received power of electromagnetic wave from RKB radio broadcasting in theoretical and experimental aspects. The observation points are in the vicinity of the RKB radio station placed in Wajiro tidal flat. The theoretical estimation takes one of two approaches: Friis transmission equation or superposition of direct and reflected waves based on geometric optics. The experimental evaluation is carried out by using a handheld spectrum analyzer. Although the theoretical evaluation based on the geometric optics is good agreement with the experimental one, the difference in the 60 [dBm] is confirmed at this stage. Since the influences of surrounding obstacles may be little on the tidal flat, experimental evaluation reveals that the received power is distributed in a concentric circle as pointed out in the theoretical one.