Compatibility with other EMW :-

           Wireless power transfer works better at higher frequencies (because higher frequencies also represent more power) and also the size of the antenna increases with low frequency hence the frequency chosen for far-field wireless power transfer is in the range of 2.45 GHz and 5.8GHz. These bands are already allocated in the ITU-R radio regulation to a number of radio services. They are also designated for industrial science and medical applications. The 2.45 GHz band is also used for radio LANs and microwave ovens, and the 5.8 GHz is used heavily for various applications like radiolocation service and Dedicated Short-Range Communications.

          Thus, electromagnetic interference is an important issue to be addressed for these frequencies because It is assumed that WPT systems working with microwaves use frequency bands around 2.45 GHz or 5.8 GHz.

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