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To design antennas for underwater communication systems using LF band, the transmission factor of dipole antennas with the sheath immersed in seawater are investigated by numerical study. Comparison of antenna characteristics between dipole antennas with different sheath structure is presented.
A fundamental study was focused on the investigation of wireless power transmission by near-field coupling from the view point of the antennas. Two types of antennas - dipole and loop antennas - were used as the transmitting antenna and the receiving antenna for electrical near-field coupling and for magnetic near-field coupling, respectively. The relationships among the power-transmission efficiency...
Based on the transmitting efficiency of WPT system calculated by using s-parameters when the WPT system is equivalent to a 2-ports lossy network [1], the effects of human body on the transmitting efficiency of WPT system with three different transmitting/receiving elements are further investigated in this paper. It is found that the WPT system using the element consisting of loop and a parasitic helical,...
The maximum transfer efficiency of WPT system with resonant transmitting/receiving elements and non-resonant transmitting/receiving elements has been analyzed and compared in this paper. It has been observed that the resonant characteristic of transmitting/receiving elements gives little impact on the maximum transfer efficiency when the receiving element is close to the transmitting element, but...
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