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Registered Member #1822
Joined: Fri Nov 21 2008, 08:04PM
Location:
Posts: 300
I want to build a device that when placed within an operating Microwave oven recieves power and turns it into 12VDC and operates a fan as part of a demonstration kit.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
There is thrmocouple powered fan that sits on top of a wood stove and circulates heat. perhaps microwave > heat > electricity > motor
Have you thought of a Crookes Radiometer? novelty stores sell them. How sweet would a glassware steam engine, Even the classic Hero's engine pulling a fan would look interesting.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Actually, I want to skip the heat step. Microwaves>Electricity>Mechanical motion
Electricity has heat. You want radiant energy > Mechanical motion. What in our universe gets pushed by light? Also what pushes light?
Perhaps a finely balanced dielectric antenna (long pyramid shspe) might move if something in a 900 watt oven focused much of the 2.45 Ghz signal on it.
Registered Member #29
Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
@cduma Rectenna is the way to go, as Steve said. The problem will be to control the power going into the antenna. Microwave ovens generate hundreds of watts of RF power, which will go into your antenna, overloading the Schottky rectifier and fan motor. Some form of RF power control will be needed to avoid releasing the factory-installed blue smoke from your rectifier/fan...
This can be done using deliberate mismatches (very small antenna, much less than wavelength/2..try wavelength/10 or smaller..that would be an antenna smaller than 1cm) with some glasses of water in the microwave oven with your test setup to act as loads. Perhaps an "evanscent mode" attenuator could be constructed for more precise power control.
@radiotech Radiation pressure is a very small effect not easily observable in a microwave oven.
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Microwave powered fan
