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What happened to RF cooking?
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jmw:
I remember about five years ago there was a big splash about improving microwave ovens and RF cooking: replace magnetrons with adjustable output solid-state RF power amps, with some ideas about specialty defrosters using HF & low-VHF frequencies. There was a prototype oven from Miele for an insane price, NXP made a line of transistors that are now unobtainium, although one part seems to live on in the MRF300. Then the buzz died and nothing was brought to market. Anyone know why things stopped?
Marco:
Miele is still selling them, at around 10k$ just not many are buying.

Having say 10 kV 13.56 MHz at kW range between the top and bottom of the oven interior is just hard. The oscillator is hard, meeting EMI limits is hard, making it safe is hard.
KaneTW:
I just found Goji from some googling. Apart from that, I've only seen inverter microwaves around which also allow for adjustment.
Marco:

--- Quote from: KaneTW on June 14, 2023, 01:27:56 am ---I just found Goji from some googling. Apart from that, I've only seen inverter microwaves around which also allow for adjustment.

--- End quote ---

They say "Dielectric RF heating typically operates within a band of 13 MHz – 6 GHz. Our latest RF module operates in the 2400 – 2500 MHz band."

It seems to me that it's not dielectric heating, but they are using an array of patch antennas rather than a magnetron tube.'

PS. also seem to be varying the frequency to move standing wave nodes around.
coppercone2:
lol they probobly taste tested it and figured out that it still tastes better from a $40 toaster oven

I have a inverter microwave, its good for defrosting left overs, if you have the time, they are less dry. If you vacuum freeze a big holiday dinner it really wins for reheatin that food.
'
And its like hard to compete with ranges IMO. If you ever put pizza on a cast iron pan to reheat... the microwave one seems only good if you are strapped for time.
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