Lorandt Foelkel explains you an 100 W Wireless Power Transfer Experiment and talks about WPT Coils and their characteristics.
Wireless Power Coils WE-WPCC WE-WPCC offer the best performance with highest Q-factor and lowest RDC values. Standardized coils, according to Wireless Power Consortium (WPC), and other off-the-shelf components from 50 mW to 200 W are available. Customized solutions for wireless power coils up to 11 kW are possible. Therefore we offer the industry‘s broadest portfolio of wireless power transfer coils.
Wireless Power 200 W Development Kit
more details about the product can be found here.