Back many years ago this idea was tried by Philips, their microwaves with
the drop down door, and with rotating aerial rather than a turntable. to be
quite honest it was rubbish and left cold spots in the food so you still had
to stop and turn the food.

I think the mistake is that the cavity is not moved in relation to the food
so standing waves still exist in the same places and only moving the food
relative to those is a true answer to this.
End of story.
Brian

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The Sofa of Brian Gaff...

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On Friday, 1 June 2018 15:23:49 UTC+1, Jimmy Wilkinson Knife wrote:
So how do they make them flat under the food cavity in flatbed ovens?
Does the magnetron sit under there and is redesigned to be flat? Or
is there some kind of fancy rotating waveguide, and the magnetron sits
at the side as before?

I asked Mr Google that exact question, and Mr Google said:

With the Flatbed microwave the microwaves are emitted from a rotating
antenna located underneath the base of your microwave. The microwaves
still bounce around the cavity but at slightly different angles to the
turntable microwave.

http://eng-au.faq.panasonic.com/app/...tbed-microwave.

Why do the flatbed microwave times vary compared to turntable ovens?

Please note that this product uses bottom feeding technology for microwave
distribution which differs from traditional turntable side feeding methods
and creates more useable space for a variety of different sized dishes.
With the flatbed style you may notice a difference in heating times (in
microwave mode) when compared against side feeding appliances.
This is quite normal and should not cause any concern. One way to
overcome this is to use a cooking trivett to place under your dish.

Owain