Wireless Chargers Reach for the Megahertz Range This excerpt today from a respected source is not really that surprising. You IEEE members on the board likely subscribe to this e-publication. We have recognized a threat to HF operations from early very high power wireless chargers. Now they are working on 1 MHz to 20 MHz frequencies at hundreds of watts of RF power. That should be fun. These systems will likely be much more ubiquitous than solar panel systems.

From the much longer article:.

But the groundwork still needs to be laid for bigger, more power-hungry electronics, and Hui and his colleagues plan to keep forging ahead. "We are currently looking for an industrial partner to develop and evaluate the ultrafast gate-drive circuits [we developed] that allow power inverters to operate up to at least 20 MHz," says Hui, noting his team has also filed a patent for a printed WPT resonator with an operating frequency in the range of 1 megahertz to tens of megahertz, which could help electronics transfer wireless power in the range of hundreds of watts. This is inevitable, but how they will contain this RF energy to a few meters if produced on a widespread basis is a troublesome question. I know our RFI committee is likely aware of the trends. But, we thought BPL was a problem? Attacks on spectrum come in all sizes and shapes. Resale to commercial interest or RFI. Bob Famiglio, K3RF Director - ARRL Atlantic Division 610-359-7300 Serving NNY, WNY, WPA, EPA, SNJ, DE and MD/DC sections <http://www.qrz.com/db/K3RF> www.QRZ.com/db/K3RF