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This paper presents the antenna to enhance DC output of RF energy harvesting system under weak signal reception environment. To select candidate sites and base stations for RF energy harvesting system, we discuss expected reception power level by a simple line-of-sight propagation model and the specification of currently used base stations. Under this site condition, this paper presents a voltage-boosting...
In this paper, a simplified local SAR measurement method is developed. A lightweight phantom composed of wave absorber embedded of electric field probe is designed. The relative permittivity and conductivity of wave absorber is determined in order to equalize the surface electric field of the wave absorber and the standard liquid phantom. For this purpose, it is suitable to equalize the amplitude...
The basic theory of wireless power transmission is presented by a pair of small dipole approximated as an infinitesimal current filament in this paper. The maximum power transmission condition and its frequency characteristics are formulated by the radiation fields from infinite current filament. The numerical simulations provide power transmission characteristics in detail.
It is required to work in various surrounding environments in order that the small antennas used for mobile terminal and RFID tag are located in the vicinity of various objects including the human body and the metal. H-shaped antenna has been proposed to obtain the characteristics not to be changed by circumference environment. The H-shaped antenna has been designed by adjusting offset position and...
This paper shows relative antenna clearance to discuss electrically occupied space of small antenna element by defining the input impedance variation in the presence of electrical disturbance near tested antennas. A half wavelength conducting wire is introduced as the disturbance. The distance from the tested antenna to the conducting wire is defined as the relative clearance and typical small antennas...
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