Microwaves Definition and 80 Threads

# I am confued with what is meant when it says "about the line AB", does this mean horizontally or vertically? The question states that the sources produce vertically polarised microwaves (I know this is relavant) and I also know that waves moving in different planes cannot interfere. Does it...

Dear forum, I was trying out two different approaches to calculate the dimensions of a ring resonator (sketch below) and got two slightly different solutions. The first approach is to assume that the waveguide wavelength has to fit n times onto the circumference of the ring (taking the average...

I understand the equation (path difference)/wavelength x 2pi = phase difference, but in this case I do not know how changing the distance of H from the source will affect the path difference. In addition to this, does minima refer to 0 amplitude (complete destructive interference) or does minima...

I thought 14 mm, 86 mm, 156 mm, 225 mm and 293 mm are the position where constructive interference happens 14 mm is the position of 1st maxima, 86 mm is the position of 2nd maxima and etc (measured from a certain position of center maxima) But when I used that numbers to calculate the fringe...

I was thinking the other day, would it be possible to have microwaves heat the air fuel mixture to activation point and have the microwaves bounce back off the gas to be picked up by a computer that generates a 3d image. this 3d image could be used to heat the gas up in a uniform way so as to...

Please help understand how to solve this question. Sorry for the terrible English. If there’s 10% chance of getting cancer from microwaves, and 3% of the population gets cancer, what is the probability that a certain person who have cancer and was exposed to microwaves got it as a result from...

Ok, here is the scenario, kinda weird but please entertain me. Say I had a huge amount of microwave radiation being shot in a particular direction. Let's say they have a wavelength of 1mm. How would i go about polarizing the microwave radiation?

So I recently picked up 40 of 10.525 GHz Microwave RADAR transmitters: I opened up one out of curiosity and had something like this (image attached) . I noticed some parts of the PCB aren't even connected to anything. How do the different shapes and sizes of the PCB interact with each-other...

Does anyone know of any studies into exactly how much various metals reflect or absorb microwaves with relationship to the microwaves wavelength and ideally theyt compounds too?

Homework Statement I have attached the question to this thread as it requires looking at a diagram. Homework Equations None The Attempt at a Solution We are supposed to attempt the question and mark it but I have a few questions if people could kindly answer for me please. In the main 6 mark...

Hi the difference between a loop antenna and a magnetic probe (B-Probe) is only that the loop antenna works in far field and B-Probe works in near field? The standard features of magnetic antenna (antenna factor, impedance matching, radiation patterns, efficiency, ecc) have the same definition...

Are microwave susceptors attenuated in viscoelastic mediums ? I am experimenting with some widely known microwave susceptors like iron oxide and silicon carbide (materials that normally convert RF to heat quite effectively). In ceramic formulations they perform great, as expected. When...

I am interested in building a microwave powered toy helicopter purely for the fun of it. As we have discovered in our initial research, it isn't possible to direct the microwaves from a microwave oven magnetron too far. I know that those microwaves are of a similar wavelength (or is it?) What...

imagine this situation: there's a very similar planet to Earth with almost the same atmosphere and surface. we want to know what lies beyond the surface to know if life exists there. so could we send or observe radio waves or microwaves with a similar telescope as arecibo that penetrates several...

-the electrons to the same shell levels of glass as the microwaves pass through and heat the material, or move electrons in a opaque material to the same energy levels, or shell levels of glass, and transparent liquids, and some plastics. In a microwave the waves traverse food, and heat the food...

Would it be possible to produce the same effect using electromagnetic waves instead of sound waves?

[unacceptable source deleted] Microwaves have a wavelength greater than visible light and are harmful. Ultraviolet light has wavelengths smaller than visible light and is harmful. In what ways are the two harmful and why isn't visible light harmful in the same ways? I'm a total noob. Just...

please explain somebody what it means I am totally confused.

Hi, For an assignment at school I am looking into the behaviors of microwave propagation. For instance I have familiarized myself with Fraunhoffer diffraction (Single slit, Double slit and grating) and an amount of wave mechanics in general. What I would like to do however is to link all...

Hi, recently there was an article in one scientific journal where they claimed that when microwaves are shined on a mixture of dielectric solid (powdered or crystalline) of high dielectric constant with some liquid, the EM field is much higher, both in the dielectric and in the liquid, as...

Different types of mirrors and reflective surfaces can be set up to reflect predetermined amounts of light, like 70% of it, or 30%, or 99% of it, while letting the rest through. Can the same be done with microwaves? It seems even very very weak metal cages can completely reflect microwaves. Is...

Why aren't the other bands (visible, UV, etc.) in the electromagnetic spectrum also seen today as part of the background radiation?

I'm working on my physics prelab, but I can't seem to get this answer. The question states: Measuring the detector´s output as a function of its position along the goniometer (look it up!), we see that there are maxima and minima in the signal. Starting at one of the maxima, we find 6...

Greetings! I'm interested in depositing a Line of fine copper powder on a plastic substrate. Due to Limitations of my situation, I want to explore the possibility of using tuned microwaves to fuse the copper particles to form a continuous conductive path. I'm aware microwaves bounce off...

How would I shoot microwaves at a piece of asteroid? Scientist shot something which I forgot, And they could get data from it? Is that possible for a price of 2,000$ I would love to see if I could find out compositions of asteroids. And what could I use? I know that NASA probably uses morse...

I am looking for an exact value of absorption coefficient of aluminium for microwaves, but I can not find it in the internet. Anyone knows where I can find it?

My friends and I have thought about this for a few years now and still can't come to a conclusion. If an electronic device was placed on a push bike and could be powered by it (for arguments sake we came up with a microwave) and was turned on while in motion, would the bike become harder to...

My school offers a concentration in RF Circuits and Microwaves in their EE program. I have an idea about what some potential jobs/careers that use these topics are but am not sure. Can anyone tell me more about the concentration are/field and what jobs would be available in it or what some...

I apologize for not following the template, but it doesn't really fit. I would have posted it elsewhere but as it's for academic purposes I think it has to be here. Please excuse me if I'm wrong. I'm a high schooler working on a project, and I was planning to send ≈3 cm microwaves through an...

Hi, I am wondering why microwaves don't escape through the door? The most common answer seems to be that the wavelength of microwave ovens is about 10-15cm which is much larger than the 1-2mm holes in the grille. But isn't the wavelength of light really just within a vector space of...

I have a question relating to waveguides. Fine, but having looked at what TE TM modes are I don't really see how I can find the frequency of the μwave with the information I have.Homework Equations A waveguide with dimensions a & b (short & long sides respetively) propogates in the TM10 mode...

Microwaves are said to be Electromagnetic waves with frequency 300 Mhz to 300 Ghz. If so, then, is the CPU of my computer running at 2Ghz, emitting some sort of microwave ? Is the microwave cooking tiny drops of water around ? (I say so, because, if the CPU is running at 2GHz, currents must be...

I need some help with properties of electromagnetic fields in the presence of microwaves. specifically will a electromagnets field, powered by an external power supply, function normally in a microwave chamber? Will the magnetron induce a current in the copper coil? Would the external power...

Could it be possible to heat the people in a house with long wavelength microwaves rather than heating all the air in the building ?

Hi, Which frequencies does an MRI machine use? Is it microwaves? Would prolonged exposure to it be damaging to the body?

The program I am looking at has an emphasis on Electromagnetics, RF and Microwaves. If I am looking at the telecommunications industry, what other exposure might be valuable? Would some course work in Signal processing or embedded systems be beneficial?

Ok, this is a separate topic about Microwaves. I have come across claim that microwaved food is safe for health as long as the food is microwaved on a low power. This is because microwaves oven that are used on high power can strip ionise a water molecule and rearraange atoms in food...

I was looking at the MS (non-thesis) in EE with a focus in Electromagnetics, RF and Microwaves. I realize jobs in military and commercial sector for communications, radar, etc. What else is out there? What kind of security would this degree offer me?

In this thought experiment the sun does not run out of fuel and the Earth is still here. So in 14 billion years we will still be detecting the CMB radiation which I presume will be a bit cooler. My question is where are these microwaves that will reach us then, now.

There are four qualitatively different effects by which microwaves can heat matter: dielectric heating ionic conductivity electronic conductivity hysteresis In most foods, 1 and 2 are of approximately equal strength. 3 can occur in soot particles formed when food burns. In pure...

hi i am currently dealing with this problem here: i have some water and want to heat it up with microwaves. how do I determine the change in temperature of the water when i just know the characteristic features of the radiation? is there an equation for it? of course this process is not...

I'm curious about how microwave ovens work. I know that there is a magnetic field in the magnetron which creates the microwaves, however, I'm curious if there is an electric field in the microwave oven box itself? I'm confused by the research I've been doing online. Also, how exactly does the...

I got an SMS educating people how to find out the presence of a hidden cam in a trial room of a textile showroom or bathroom. It goes like this :- "If you can't make a call in the room,the there is a hidden cam. This is due to the interference of the fibre optic with the signal transfer."...

My physics in school says: "Air molecules are too small to be excited [by microwaves], and [they] also have no effect on glass, plastic, or ceramic." So I thought hey, let's test that! I'm glad I did. See, I put a empty glass measuring cup from the pantry into the microwave and put it on high...

Hello people, i have got a few thoughts which i would like to share. I few month ago i foundout that there are laser beams in the frequency range of of microwaves (maser beams). (http://en.wikipedia.org/wiki/Maser) I consider the following situation: If a conducting medium (lets think...

Hello, please, if anybody knows popular books (I mean hard copy books) on topics like microwaves, ultra-high frequencies, radars, phased arrays, vacuum tubes, please post here the references. May be it is possible to obtain electronic versions of such books (for example at books.google.com)...

I understand that microwaves cause water in food to heat up, but I don't understand why it is only water. Why won't the say lipids or protein molecules in food heat up why is it only water. And on a related topic is there a way to use frequency to not heat up water but to lengthen the bonds...

I have looked all of the internet trying to find how a magnetron produces microwaves to find nothing. Can anyone tell how a magnetron produces microwaves?

I know that the metal mesh on the microwave oven door can block microwaves because the holes are much smaller than the wavelengths. It is the same reason why some radio telescopes can be made with a mesh. What is this effect called?

If infared radiation is responsible for somethings heat, why do microwaves use radio waves?