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Wireless power transfer systems of resonance coupling or inductive coupling utilize electrically very small antennas, which are either self-resonant or non-self-resonant. The system with non-self-resonant antennas requires the external circuit for impedance matching and high power transfer efficiency. This paper presents the design formulas for four kinds of external circuits, and discusses their...
Wireless sympathetic connection systems are proposed which employ a single resonator located between two electrically small non-resonant antennas. Symmetric configurations consisting of two equal transmitting and receiving antennas and a resonator are characterized by the equivalent reactive circuits with two inductors and one capacitor in the case of closed path type antennas and with two capacitors...
The usage of electrically very small antennas in near field region (NFR) is fundamentally different from the usage in far field region (FFR). FFR and NFR are compared and summarized in Table. 1. The principal target in the design of the FFR applied electrically small antennas is to lower the Q factor whose limit has been given by LJ. Chu in 1948 [1]. On the contrary, the NFR applied antennas are desired...
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