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Help on tranmit power regulations of FCC

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sbhalerao

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Hello to all,
I am presently involved in a project and I am designing a RF to DC convertor and I want it to operate at 2.4 GHz. People have already made RF to DC convertors, but these work in frequency of around 100 MHz..
Recently I came across FCC part 15 regulations on transmit power in ISM band .. I read that 30 dBm is the limit... But that was transmitting data.. I intend to transmit RF signal and convert that to DC for powering a mobile device....
Could anyone of you clarify on the above problem... My aim is *not* to transmit data...
Thanking you in advance..
Shantanu.
 

I do not remember the details, but to transmit that much power you have to hop around in frequency with a minimum number of hops (I think it is something like 20 discrete frequency hops minimum), and you are limited in how much transmit antenna gain you can use. I do not think there is any requirement to actually send any data/modulation.
 

hi i'm not sure if i interpret it correctly, but i think FCC assumes your 2.4ghz carrier as an 'intentional radiator', which does mean anything that you intended to radiate would be bounded to the regulation.
 

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    sbhalerao

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Hi,
All I propose to do is to harness power from the transmitted RF energy... So I do not think that it qualifies under the "intentional use" as such... I do not want to transmit any data....
Still I would be greatly helped if someone could clarify on the situation...
Thanking you...
Shantanu
 

There is the "Industrial, Scientific, and Medicine" part of the rules. These may have higher limits if your device qualifies. The other problem you face is the safety laws about microwave power density near humans.

In general, if this is a short term academic type experiment the government will not bother what you do in the ISM band. It is when you make a product for the public that you have to get it certified. In many countries the ISM band can be used by hams with 1 kW+ rf power into antennas with unlimited gain.
 

I am 100% sure this would be classified as an "intentional radiator".

The trasmitter's whole purpose in life would be to radiate energy for you to convert to dc. You will be doing things to deliberately enhance that radiation, like adding a transmit antenna! It is not a computer, for instance, which radiates as a consequency of doing something entirely else (digital computing).
 

The regulations in US are 30 dBm for EIRP in the ISM band.
And for Europe the regulations are even more restrictive,
the EIRP is limited to 20 dBm

Added after 9 minutes:

and if the Tx is going to be use in point
to point the EIRP can be as high as 4W
 

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