i want to have your suggesions about this project

Thread Starter


Joined Feb 15, 2012
I want to ask if someone have an experience for helping me doing this jop.

I want to make a wireless sensor node but without batteries.
The idea is to transmit microwaves with high power and receive it from an antenna at the node position converting it to DC power and saving it in super capacitors or batteries to use this power as the power source for the wireless node.

suppose the distance between the wireless node and the receiver dont exceed more than 10 m.

suppose that all sensors that i use are passive.

Is that can be achievable?
How can i do this?

Now i have 40 MHZ microwave signal with 100W power .
At the receiver which type of antenna i use and for maximum power transmission how can i add equivalent circuit?

What is the design circuit of the filter that catches this 40MHZ signal?


Joined Oct 26, 2011
40mHZ is HF, not microwave
This type of technology is already being used with RFID chips, howbeit without energy storage


Joined Mar 24, 2008
100W is a lot of power. There could be long term health effects if you or someone is around it constantly.

Even if the signal is tightly beamed you will get around 10W (this is an optimistic assumption). There will be losses in conversion too, it is inevitable.

But the health consequences is what really worries me. Most high power RF is not around people, this is for a reason.