Shielding from microwaves

[eric]

Hi, I am having a little microwave experiment, and I want to shield some
cracks from leaking microwaves. A pal said to me that a paper-type
called "mica" is used for such reasons in microwave ovens. Actually what
he told me is that it allows microwaves to pass through, but it blurs
them so as they are not focused as before.

Is it true, or does anyone know any better way to make leaking
microwaves less harmful (apart from Faraday cage, this is too hard for
me to make, I suppose).

 

[mike]

eric wrote:

Hi, I am having a little microwave experiment, and I want to shield some
cracks from leaking microwaves. A pal said to me that a paper-type
called "mica" is used for such reasons in microwave ovens. Actually what
he told me is that it allows microwaves to pass through, but it blurs
them so as they are not focused as before.

Is it true, or does anyone know any better way to make leaking
microwaves less harmful (apart from Faraday cage, this is too hard for
me to make, I suppose).

Get yourself a new "pal" for microwave advice.
Copper tape works well when you have clean metal on both sides of the crack.
It would be helpful to disclose something, anything about the experiment
and the exact problem you're having.
mike


--
Return address is VALID!
Bunch-O-Stuff Forsale Here:
http://mike.liveline.de/sale.html

 

[eric]

mike wrote:

Get yourself a new "pal" for microwave advice.
Copper tape works well when you have clean metal on both sides of the
crack.
It would be helpful to disclose something, anything about the experiment
and the exact problem you're having.
mike

It is a classic experiment that proves that there is no ether. For
various reasons we do not want to have microwaves leaking behind the
surface they hit. I think the ideal for it would be some kind of
material that "absorbs" the microwaves, as lead does for radiation. If
you know such materials or have better ideas, it would be great to let
me know.

 

[eric]

eric wrote:

It is a classic experiment that proves that there is no ether. For
various reasons we do not want to have microwaves leaking behind the
surface they hit. I think the ideal for it would be some kind of
material that "absorbs" the microwaves, as lead does for radiation. If
you know such materials or have better ideas, it would be great to let
me know.

On the web I came across references to Velostat. Does anyone know if it
absorbs microwaves and where may one get it from?

 

[mike]

eric wrote:

mike wrote:

Get yourself a new "pal" for microwave advice.
Copper tape works well when you have clean metal on both sides of the
crack.
It would be helpful to disclose something, anything about the experiment
and the exact problem you're having.
mike


It is a classic experiment that proves that there is no ether. For
various reasons we do not want to have microwaves leaking behind the
surface they hit. I think the ideal for it would be some kind of
material that "absorbs" the microwaves, as lead does for radiation. If
you know such materials or have better ideas, it would be great to let
me know.
That's an entirely different question.

What frequency are your microwaves? Water is a pretty good absorber
at some frequencies. Oxygen works damn well at other frequencies.
You can buy microwave absorber material, but I can't give you details.

Do you really have to absorb? Can you use metal to reflect the
microwaves out of the experimental field?

Ether DOES exist...I use it to start my lawnmower.
mike

--
Return address is VALID!
Bunch-O-Stuff Forsale Here:
http://mike.liveline.de/sale.html

 

[eric]

mike wrote:

eric wrote:
mike wrote:

You can buy microwave absorber material, but I can't give you details.

I would be interested in such material. Can you provide some examples?
The microwave frequency is close to the cooking microwave frequency.

Do you really have to absorb? Can you use metal to reflect the
microwaves out of the experimental field?

No, basically I have to absorb.

Ether DOES exist...I use it to start my lawnmower.

?

 

[George Jetson]

"eric" <eric@no.email> wrote in message news:1180362985.537580@athnrd02...

mike wrote:

eric wrote:
mike wrote:

You can buy microwave absorber material, but I can't give you details.


I would be interested in such material. Can you provide some examples? The
microwave frequency is close to the cooking microwave frequency.




Do you really have to absorb? Can you use metal to reflect the
microwaves out of the experimental field?

No, basically I have to absorb.


Ether DOES exist...I use it to start my lawnmower.


?

Google "rf absorber" and bring your checkbook.

http://www.eccosorb.com/main/RegionalHome.html;jsessionid=8371EA833DACBCEA8757A8AA0E3BDBF2
--
They can have my command prompt when they pry it from my cold dead fingers.

 

[Cees Keyer]

eric wrote:

mike wrote:

Get yourself a new "pal" for microwave advice.
Copper tape works well when you have clean metal on both sides of the
crack.
It would be helpful to disclose something, anything about the experiment
and the exact problem you're having.
mike


It is a classic experiment that proves that there is no ether. For
various reasons we do not want to have microwaves leaking behind the
surface they hit. I think the ideal for it would be some kind of
material that "absorbs" the microwaves, as lead does for radiation. If
you know such materials or have better ideas, it would be great to let
me know.
You Could use feritte tiles with carbon conical absorbers. But they are

not that cheap, or peal off the coating from a stealth bomber....
otherwise shielding should be done, use as already suggested copper tape
to cover up the leaks. If you have a gap less then 1/10 wavelenght
there should not be a huge problem (except is you use some MWatt
tranmitter.)


--
# A brainstorm to one person could be a slight draft to the other one.
# Cees Keyer, Amsterdam school of technology (change -at- in @ in E)
# dept. Electronic Engineering, Weesperzijde 190, 1097DZ Amsterdam, NL
# pe1jmj-at-amsat.org Voice: (+31)20-5951639, Fax: (+31)20-5951420

 

[Ancient_Hacker]

On May 23, 2:38 pm, eric <e...@no.email> wrote:

Is it true, or does anyone know any better way to make leaking
microwaves less harmful

Go walking down any alley. Within a block you'll find a discarded
microwave oven. If it's an older oven it will have some sort of
metallic gasket around the door frame. Take that.

 

[Jon Elson]

eric wrote:

mike wrote:


Get yourself a new "pal" for microwave advice.
Copper tape works well when you have clean metal on both sides of the
crack.
It would be helpful to disclose something, anything about the experiment
and the exact problem you're having.
mike



It is a classic experiment that proves that there is no ether. For
various reasons we do not want to have microwaves leaking behind the
surface they hit. I think the ideal for it would be some kind of
material that "absorbs" the microwaves, as lead does for radiation. If
you know such materials or have better ideas, it would be great to let
me know.
Graphite should absorb microwaves. It works best if you form it

into a bunch of pyramids, but I think just flat sheets of it
will work, too. Any resistive sheet material will absorb
microwave energy.

Jon