Fundamental Study of the Two Resonances Helmet Antenna for Disaster Prevention

Abstract

We have studied the helmet antenna for disaster prevention in order to propose the structure that a transceiver, antenna and microphone are mounted on the helmet which has already been served as disaster prevention. Since the helmet antenna needs to have the characteristics of miniaturization and multiband, we have considered the combined folded dipole antenna with one port. First, we analyze the characteristics of the plane and hemispherical antenna model. Next, we analyze the restraint of radiation to the head direction using the human head model.