To evaluate radiation loss and conductor loss which are the cause of deterioration in the wireless electric power transmission, a calculation method of a transmission electric power, a radiated power, and a conductor loss as a ratio to the input electric power is proposed. The dependency of those ratios to the resistance and the reactance of the receiving circuit are clarified for the short distance wireless electric power transmission between small dipoles, and the method to improve the transmitting efficiency is investigated.%無線電力伝送の劣化の原因となる放射損および導体損について評価するため，伝送電力，放射電力，熱に変わる損失の入力電力に対する割合の計算法を提案し，微小ダイポール間の近距離無線電力伝送に関して，それら割合の受信回路の抵抗とリアクタンス備に対する依存性を明らかにして，伝送効率の改善法について考察している．
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