In general, you want to design a wireless power link to be as efficient as possible. Picking lower frequencies like 100 kHz, as Warspeed suggests, means you don't have to deal with the headache of picking an ISM band.
But if you have serious design constraints affecting the size and form factor of your coils, you might want to pick a frequency where they operate more efficiently (i.e. have high Q factors). Q factor is a function of frequency. Generally, large coils have higher Q at lower frequencies and smaller coils have higher Q at higher at higher frequencies. Popular RF frequencies are 6.78 and 13.56 MHz.
For practical reasons, you might want to place the power transmission frequency above the data transmission frequency, the further apart the better.
Any harmonics or broadband noise generated from the power transmission will then be well out of the way of your data link.
I would run the data channel at 6.78 Mhz and the power circuit at 13.56 Mhz.
These bands are harmonically related for a very good reason.
Any interference generated at 6.78 Mhz is bound to be mostly harmonics.
Knowing that, the powers that be, very wisely made the ISM bands harmonically related so any resultant interference is only to other ISM users.
So its best to run the power at the higher of the two frequencies to lessen any interference to your own system..
What exactly is this 1-5 Mhz signal ?
The 2Mhz receiving antenna will pick up a lot of 13.56 Mhz energy for sure, but that can be fairly readily filtered out leaving the 2Mhz signal unmolested.I just want to make sure if I use 13.56MHz power coil, it will not impact the 2MHz signal I received at the secondary data coil. Will it?
The 2Mhz receiving antenna will pick up a lot of 13.56 Mhz energy for sure, but that can be fairly readily filtered out leaving the 2Mhz signal unmolested.
Low received 2 Mhz data amplitude is less of a problem, because it can be amplified up after reception, unlike the received raw power received at 13.56 Mhz.
If you are transmitting at 13.56 Mhz most of the energy will be there, plus some wideband phase noise and harmonics. There should be nothing below that.
I doubt if you can just buy some off the shelf circuit boards and string it all together and expect it to work first time.
Everything really needs to be properly designed and tested to suit your specific purpose, of which I have absolutely no idea.
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