Edgar J. Kaiser
Certified Consultant
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Posted:
6 months ago
Sep 29, 2024, 10:57 a.m. EDT
The wavelength of the 2.45 GHz radiation is approximately 12 cm. The chamber is probably bigger and it has a number of modes with more than one maximum. It is even unlikely to see a mode with just one central maximum.
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Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
The wavelength of the 2.45 GHz radiation is approximately 12 cm. The chamber is probably bigger and it has a number of modes with more than one maximum. It is even unlikely to see a mode with just one central maximum.
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Posted:
6 months ago
Sep 29, 2024, 1:35 p.m. EDT
This is really more of a microwave engineering question.
In the usual microwave oven, the chamber is several wavelengths in size. So one way to think about it is that microwaves reflect from the walls and interfere. If there are enough paths (and maybe the entrance point is chosen carefully) then the energy density will be roughly uniform- often what we want.
In this case the chamber is only a few wavelengths in size. So seeing hot spots is not unexpected, as there are only a few ways that waves can reflect and interfere. If the thing to be heated is small it might make sense to choose a chamber with just ONE mode with energy concentrated in a single location.*
It may be easier to understand what is happening in THIS geometry if you make several plots of different components of the electric field (I think your plot is of the field magnitude).
- Turns out I recently finished a simulation of heating a small sample in a 2.45 GHz waveguide. In this case the sample was placed roughly in the center and a movable short was adjusted to provide maximum heating.
This is really more of a microwave engineering question.
In the usual microwave oven, the chamber is several wavelengths in size. So one way to think about it is that microwaves reflect from the walls and interfere. If there are enough paths (and maybe the entrance point is chosen carefully) then the energy density will be roughly uniform- often what we want.
In this case the chamber is only a few wavelengths in size. So seeing hot spots is not unexpected, as there are only a few ways that waves can reflect and interfere. If the thing to be heated is small it might make sense to choose a chamber with just ONE mode with energy concentrated in a single location.*
It may be easier to understand what is happening in THIS geometry if you make several plots of different components of the electric field (I think your plot is of the field magnitude).
* Turns out I recently finished a simulation of heating a small sample in a 2.45 GHz waveguide. In this case the sample was placed roughly in the center and a movable short was adjusted to provide maximum heating.