Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [microwave]

Microwaves are radio waves with a frequency from 300MHz to 300GHz which corresponds to a wavelength of one meter down to one millimeter. Often in RF engineering however it is used to refer to a narrower region such as 1 to 100GHz.

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Why do microwave ovens, with metal walls, not blow up?

Why does a microwave oven with metal (?) walls work fine, but if I (theoretically) put a metal spoon in it, "bad things" may happen? Maybe these internal walls are not conductive?
Kamil
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How dangerous is a magnetron?

I took apart a microwave, and when I saw the magnetron, I conviniently remembered that I had heard that magnetrons were dangerous. I decided to research this a bit further (I know, great timing) and I found that some magnetrons contains berilyum…
skillz21
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Microwaves going through a hole - attenuation?

We have a microbalance that has a "hangdown wire" supporting a sample pan in a steel chamber. We need to heat this with microwaves, most probably at the common 2.4GHz of microwave ovens. This wire will probably be a quartz fiber. However, it has to…
Dirk Bruere
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Detecting leakage from domestic microwave ovens

Is there any quick and easy way to determine if a microwave oven is leaking radiation from the door edges? By quick and easy I mean without buying a dedicated meter. And if there is an undetected leak, how far do microwaves generated by a domestic…
John
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does my microwave oven have acceptable leakage?

I remembered that a microwave oven works on 2.4 GHz which is same as wifi frequency so I did a test for the leakage for my microwave oven, I put the oven's door in front of 2.4 GHz wifi router(line of sight) with a distance of 1.5 meters I used…
Computer_guy11
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Free air or waveguide wavelength?

If you have a microwave frequency of say 2.45 GHz, would you use that frequency in a simple rectangle cross section waveguide, or do you need to use the "lamdba g" waveguide frequency I've read about and if so, why? I don't understand why you…
user196795
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How to build a simple waveguide and start on microwave electronics?

I have an electrical engineering qualification and new to microwave engineering, but really never did much RF or microwave when studying. I want to build a very basic and simple waveguide microwave system say using WR 340 waveguide to produce a…
user196795
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Is a microwave oven an inductive load?

Is a microwave oven considered an inductive load? I have a battery back-up and uninterrupted power supply system that I would like to connect to the microwave oven. But the UPS manufacturer cautions not to connect to inductive loads. So how much of…
Arvind Keerthi
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Efficiency of the microwave oven

Unloaded power transformers consumes very little real power. Similarly, will an empty microwave oven consumes very little power too compared if it is loaded full with food? If this is true, can we deduce the microwave oven is more efficient in…
soosai steven
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What phase-noise can I expect for high-end microwave sources?

I would like to know what type of phase-noise I can expect if I want to be able to produce a single RF frequency source. It does not have to be tunable, it just needs to be around 10 GHz. What is the state-of-the-art for electronics that can do such…
Steven Sagona
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Is there a device to generate a sequence of microwave harmonics?

I want to produce a Fourier series of microwave harmonics in a cavity. My first thought was to order a bunch of magnetrons tuned to each harmonic, up to some limit and get our lab tech to modify a cavity. The problems with this are: there isn't…
holyjoly
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Why do we say that the load impedance must be equal to the characteristic impedance to have adaptation/maximum power transfer?

If impedance matching requires conjugate complex matching of the transmission line to the generator impedance (for optimal power transfer), why do we say that the load impedance must be equal to the characteristic impedance? So in order to have…
Scipio
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What is the switching/amplifier component in a 2.4 GHz wifi microwave transmitter

I know that it is hard for the transistors that i know to switch at high frequency but the latest microprocessors and microwave transmitting chips use GHz frequency, what is the gain element there (like a transistor, spark gap etc)
Sartem Cacartem
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Long distance point to point microwave links - frequency and beam dispersion/angle?

I occasionally see dishes on towers pointing horizontally, which I assume are long distance microwave links. Can anyone give me an example of frequency used and beam angle in radians of the directional beam?
Dirk Bruere
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Can I safely run the microwave for an extended time with just a bowl of water?

I would like to leave a microwave running for several minutes (2-5, the longer the better) as part of a research project (I'm measuring the microwave emissions). Is it safe to put a bowl of water in the microwave to prevent the magnetron from…
user2562609
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