Electric power transmission system with power transmission and receiving antennas

An electric power transmission system, comprising:

• a power transmission antenna that constitutes a series resonator with an inductance component of L1 and a capacitance component of C1, and to which AC power is input;
• an inverter unit that converts DC voltage to AC voltage of a predetermined frequency to output to the power transmission antenna, the output of the inverter unit being input directly to the series resonator of the power transmission antenna;
• a power receiving antenna that constitutes a series resonator electromagnetically coupled to the series resonator of the power transmission antenna, the series resonator of the power receiving antenna having an inductance component of L2 and a capacitance component of C2, and which receives electromagnetic energy from the series resonator of the power transmission antenna via electromagnetic fields;
• a rectifying unit that rectifies an output of the power receiving antenna to output DC power;
• and
• a load to which an output of the rectifying unit is input, wherein
• the following relationships are established:
• L1C1=L2C2 (Formula 2)
• and
• L1/C1>L2/C2 (Formula 6),
• wherein
• a coupling coefficient between the power transmission antenna and the power receiving antenna is denoted as k,
• there are n modes of power transmission where the load has a resistance value of Rh in an hth mode, where h is an integer ranging from 1 to n,
• the resistance value of the load among the n modes varies from a minimum resistance value of Rhmin to a maximum resistance value of Rhmax, and
• the following relationship is established:
• R
• h
• ⁢
• ⁢
• m
• ⁢
• ⁢
• i
• ⁢
• ⁢
• n
• ≤
• k
• ⁢
• L
• 2
• C
• 2
• ≤
• R
• h
• ⁢
• ⁢
• m
• ⁢
• ⁢
• ax
• .
• (
• 12
• )