Characterization of wireless power transfer links by network invariants

Networks for wireless power transfer are currently receiving considerable interest. However, it is important to have a common set of parameters in order to describe the performance of these networks. These parameters are the gains and the conjugate image immittances. The conjugate image immittances play a fundamental role and, in this contribution, they are all described in terms of the Rollett stability factor invariant. In addition to the conjugate image immittances three other gains values are necessary to describe a wireless power transfer network: they are the power gain, the available gain and the transducer gain and they also share a common immittance representation.