elektroda.net NewsGroups Forum Index - Electronics Design - what material reflects microwave?
jgy2001
Guest
Guest
Thu Aug 26, 2010 9:49 pm
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
Tim Wescott
Guest
Guest
Thu Aug 26, 2010 9:49 pm
On 08/26/2010 11:49 AM, jgy2001 wrote:
Quote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Metal, or just about anything that's metalized. Aluminized mylar would
certainly count as a "simple film", and is somewhat conformal if you
don't mind cussing a bit.
If you can't find it anywhere else find a hobby shop that caters to
model airplane builders and ask for metallic Monocoat, or check out the
hobby websites (Tower Hobbies is good).
You can also get aluminum backed duct tape (you _don't_ want 'regular'
silver-colored duct tape -- you want the stuff that looks like aluminum
foil).
Or you could make a form, spray 3M 77 contact cement on it, and apply
aluminum foil.
Come to think of it, even something like silver paint might -- although
if it did it'd probably scatter quite a bit.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html
John Fields
Guest
Guest
Thu Aug 26, 2010 9:49 pm
On Thu, 26 Aug 2010 11:49:50 -0700 (PDT), jgy2001 <jgy2001_at_gmail.com>
wrote:
Quote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
---
Yes, of course.
---
Quote:
Thank you.
---
You're welcome.
---
JF
John Larkin
Guest
Guest
Thu Aug 26, 2010 9:49 pm
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm <mpmillard_at_aol.com>
wrote:
Quote:
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
Quote:
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
John
John Fields
Guest
Guest
Thu Aug 26, 2010 9:49 pm
On Thu, 26 Aug 2010 12:14:57 -0700, John Larkin
<jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote:
Quote:
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm <mpmillard_at_aol.com
wrote:
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
wrote:
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
---
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
---
JF
David Eather
Guest
Guest
Thu Aug 26, 2010 10:07 pm
On 27/08/2010 5:08 AM, Tim Wescott wrote:
Quote:
On 08/26/2010 11:49 AM, jgy2001 wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Metal, or just about anything that's metalized. Aluminized mylar would
certainly count as a "simple film", and is somewhat conformal if you
don't mind cussing a bit.
If you can't find it anywhere else find a hobby shop that caters to
model airplane builders and ask for metallic Monocoat, or check out the
hobby websites (Tower Hobbies is good).
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Metal, or just about anything that's metalized. Aluminized mylar would
certainly count as a "simple film", and is somewhat conformal if you
don't mind cussing a bit.
If you can't find it anywhere else find a hobby shop that caters to
model airplane builders and ask for metallic Monocoat, or check out the
hobby websites (Tower Hobbies is good).
The "Emergency Space Blankets" beloved by rescue and emergency services
are aluminized mylar and cost something like one or two dollars per
square yard.
Quote:
You can also get aluminum backed duct tape (you _don't_ want 'regular'
silver-colored duct tape -- you want the stuff that looks like aluminum
foil).
Or you could make a form, spray 3M 77 contact cement on it, and apply
aluminum foil.
Come to think of it, even something like silver paint might -- although
if it did it'd probably scatter quite a bit.
David Eather
Guest
Guest
Thu Aug 26, 2010 10:10 pm
On 27/08/2010 6:54 AM, Rich Grise on Google groups wrote:
Quote:
On Aug 26, 12:30 pm, John Fields<jfie...@austininstruments.com
wrote:
On Thu, 26 Aug 2010 12:14:57 -0700, John Larkin
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm<mpmill...@aol.com
On Aug 26, 1:49 pm, jgy2001<jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
No, John, they're designed _exactly_ to heat the packaging (hence the
"this side down" admonition) and cause the heat generated there to
heat
the food by conduction, thus popping the corn on the bottom or
browning
the crust of a hot pocket thingie.
I suppose popcorn in a microwave _without_ the reluctor on the bottom
of the
pack would pop eventually, but it'd probably burn the corn before the
rest
of it pops.
Who wants to volunteer to do this experiment? Take a microwave bag,
dump
the corn out into a (microwave-safe!) plastic plate, dump some plain
ordinary
popcorn on another (microwave-safe) plastic plate, and start them up?
Please report back with results.
Oh, wait - you'd need two ovens. Or a stopwatch! ;-)
Thanks!
Rich
wrote:
On Thu, 26 Aug 2010 12:14:57 -0700, John Larkin
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm<mpmill...@aol.com
On Aug 26, 1:49 pm, jgy2001<jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
No, John, they're designed _exactly_ to heat the packaging (hence the
"this side down" admonition) and cause the heat generated there to
heat
the food by conduction, thus popping the corn on the bottom or
browning
the crust of a hot pocket thingie.
I suppose popcorn in a microwave _without_ the reluctor on the bottom
of the
pack would pop eventually, but it'd probably burn the corn before the
rest
of it pops.
Who wants to volunteer to do this experiment? Take a microwave bag,
dump
the corn out into a (microwave-safe!) plastic plate, dump some plain
ordinary
popcorn on another (microwave-safe) plastic plate, and start them up?
Please report back with results.
Oh, wait - you'd need two ovens. Or a stopwatch! ;-)
Thanks!
Rich
Popcorn contains too little water (about 10%) to effectively absorb
microwaves. Hence the "this side down" panel absorbs microwave energy
and heats up.
mpm
Guest
Guest
Thu Aug 26, 2010 10:11 pm
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
Quote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
-mpm
mpm
Guest
Guest
Thu Aug 26, 2010 10:18 pm
On Aug 26, 2:14 pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
Quote:
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm <mpmill...@aol.com
wrote:
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
John
wrote:
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
John
Maybe for frozen dinners, but I'm pretty sure the popcorn bag variety
reflects?
I'm trying to remember the "technical" name for it.....
Getting old is a bitch.
Tim Wescott
Guest
Guest
Thu Aug 26, 2010 10:57 pm
On 08/26/2010 02:07 PM, David Eather wrote:
Quote:
On 27/08/2010 5:08 AM, Tim Wescott wrote:
On 08/26/2010 11:49 AM, jgy2001 wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Metal, or just about anything that's metalized. Aluminized mylar would
certainly count as a "simple film", and is somewhat conformal if you
don't mind cussing a bit.
If you can't find it anywhere else find a hobby shop that caters to
model airplane builders and ask for metallic Monocoat, or check out the
hobby websites (Tower Hobbies is good).
The "Emergency Space Blankets" beloved by rescue and emergency services
are aluminized mylar and cost something like one or two dollars per
square yard.
On 08/26/2010 11:49 AM, jgy2001 wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Metal, or just about anything that's metalized. Aluminized mylar would
certainly count as a "simple film", and is somewhat conformal if you
don't mind cussing a bit.
If you can't find it anywhere else find a hobby shop that caters to
model airplane builders and ask for metallic Monocoat, or check out the
hobby websites (Tower Hobbies is good).
The "Emergency Space Blankets" beloved by rescue and emergency services
are aluminized mylar and cost something like one or two dollars per
square yard.
Of course! Why didn't I think of that?
(please don't answer).
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html
Rich Grise on Google grou
Guest
Guest
Thu Aug 26, 2010 11:46 pm
On Aug 26, 12:11 pm, mpm <mpmill...@aol.com> wrote:
Quote:
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
....
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Actually, that stuff (called "reluctor") doesn't _reflect_ the
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
....
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Actually, that stuff (called "reluctor") doesn't _reflect_ the
microwaves - aluminum
foil does that admirably (I saw a photo shoot in an early microwave
oven cookbook -
they wrapped an ice cube in foil, set it in the oven next to a cup of
water, boiled the
water and the ice cube was virtually untouched.) But that stuff on the
bottom of the
popcorn pack is designed to _absorb_ the microwaves and turn them into
just plain
ol' heat. Sometimes you get those "hot pocket" thingies with reluctor
wrapped around
them to brown the crust.
I have a suspicion that the reluctor stuff is somehow related to
"radar-absorbent
materal" paint for stealth aircraft. ;-)
Cheers!
Rich
tm
Guest
Guest
Thu Aug 26, 2010 11:50 pm
"jgy2001" <jgy2001_at_gmail.com> wrote in message
news:5177ada3-35d5-48b5-bfd9-e089c0d136c1_at_v6g2000prd.googlegroups.com...
Quote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
cellular and wifi signals?
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
How about single side PC board material? The real thin
stuff, 0.008 inch FR4 with 1 Oz copper is cheap. Check ebay.
tm
--- news://freenews.netfront.net/ - complaints: news_at_netfront.net ---
Rich Grise on Google grou
Guest
Guest
Thu Aug 26, 2010 11:54 pm
On Aug 26, 12:30 pm, John Fields <jfie...@austininstruments.com>
wrote:
Quote:
On Thu, 26 Aug 2010 12:14:57 -0700, John Larkin
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm <mpmill...@aol.com
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm <mpmill...@aol.com
On Aug 26, 1:49 pm, jgy2001 <jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
No, John, they're designed _exactly_ to heat the packaging (hence the
"this side down" admonition) and cause the heat generated there to
heat
the food by conduction, thus popping the corn on the bottom or
browning
the crust of a hot pocket thingie.
I suppose popcorn in a microwave _without_ the reluctor on the bottom
of the
pack would pop eventually, but it'd probably burn the corn before the
rest
of it pops.
Who wants to volunteer to do this experiment? Take a microwave bag,
dump
the corn out into a (microwave-safe!) plastic plate, dump some plain
ordinary
popcorn on another (microwave-safe) plastic plate, and start them up?
Please report back with results.
Oh, wait - you'd need two ovens. Or a stopwatch! ;-)
Thanks!
Rich
Jim Yanik
Guest
Guest
Fri Aug 27, 2010 1:19 am
"tm" <the_obamunist_at_whitehouse.gov> wrote in
news:i56qvb$25jk$1_at_adenine.netfront.net:
Quote:
"jgy2001" <jgy2001_at_gmail.com> wrote in message
news:5177ada3-35d5-48b5-bfd9-e089c0d136c1_at_v6g2000prd.googlegroups.com...
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
household aluminum foil
Quote:
I am thinking simple laminated material, such as film, or tape or
plastic sheets?
plastic sheets?
glue aluminum foil to your plastic sheet;use 3M spray adhesive.
Quote:
Can I embed simple film with some kind of simple metal to reflect
microwave signals?
Thank you.
How about single side PC board material? The real thin
stuff, 0.008 inch FR4 with 1 Oz copper is cheap. Check ebay.
tm
--- news://freenews.netfront.net/ - complaints: news_at_netfront.net ---
microwave signals?
Thank you.
How about single side PC board material? The real thin
stuff, 0.008 inch FR4 with 1 Oz copper is cheap. Check ebay.
tm
--- news://freenews.netfront.net/ - complaints: news_at_netfront.net ---
--
Jim Yanik
jyanik
at
localnet
dot com
mpm
Guest
Guest
Fri Aug 27, 2010 1:25 am
On Aug 26, 4:10 pm, David Eather <eat...@tpg.com.au> wrote:
Quote:
On 27/08/2010 6:54 AM, Rich Grise on Google groups wrote:
On Aug 26, 12:30 pm, John Fields<jfie...@austininstruments.com
wrote:
On Thu, 26 Aug 2010 12:14:57 -0700, John Larkin
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm<mpmill...@aol.com
On Aug 26, 1:49 pm, jgy2001<jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
No, John, they're designed _exactly_ to heat the packaging (hence the
"this side down" admonition) and cause the heat generated there to
heat
the food by conduction, thus popping the corn on the bottom or
browning
the crust of a hot pocket thingie.
I suppose popcorn in a microwave _without_ the reluctor on the bottom
of the
pack would pop eventually, but it'd probably burn the corn before the
rest
of it pops.
Who wants to volunteer to do this experiment? Take a microwave bag,
dump
the corn out into a (microwave-safe!) plastic plate, dump some plain
ordinary
popcorn on another (microwave-safe) plastic plate, and start them up?
Please report back with results.
Oh, wait - you'd need two ovens. Or a stopwatch! ;-)
Thanks!
Rich
Popcorn contains too little water (about 10%) to effectively absorb
microwaves. Hence the "this side down" panel absorbs microwave energy
and heats up.- Hide quoted text -
- Show quoted text -
On Aug 26, 12:30 pm, John Fields<jfie...@austininstruments.com
wrote:
On Thu, 26 Aug 2010 12:14:57 -0700, John Larkin
On Thu, 26 Aug 2010 12:11:53 -0700 (PDT), mpm<mpmill...@aol.com
On Aug 26, 1:49 pm, jgy2001<jgy2...@gmail.com> wrote:
What kind of simple material reflects microwave energy, such as
cellular and wifi signals?
Anything metallic.
The material that is embedded in some microwave popcorn bags (which is
why they always say "This Side Down".
Ditto for some microwave frozen dinner entres.
Those things are designed to absorb, not reflect.
I disagree.
AFAIK, "Those things" are designed to reflect the RF into the food, in
order to heat the food, instead of heating the packaging and causing
the heat generated there to heat the food by conduction.
No, John, they're designed _exactly_ to heat the packaging (hence the
"this side down" admonition) and cause the heat generated there to
heat
the food by conduction, thus popping the corn on the bottom or
browning
the crust of a hot pocket thingie.
I suppose popcorn in a microwave _without_ the reluctor on the bottom
of the
pack would pop eventually, but it'd probably burn the corn before the
rest
of it pops.
Who wants to volunteer to do this experiment? Take a microwave bag,
dump
the corn out into a (microwave-safe!) plastic plate, dump some plain
ordinary
popcorn on another (microwave-safe) plastic plate, and start them up?
Please report back with results.
Oh, wait - you'd need two ovens. Or a stopwatch! ;-)
Thanks!
Rich
Popcorn contains too little water (about 10%) to effectively absorb
microwaves. Hence the "this side down" panel absorbs microwave energy
and heats up.- Hide quoted text -
- Show quoted text -
Maybe "susceptor" is the right term I was thinking about, but it
doesn't ring a bell.
To the OP, US Patent # 6,559,430 is worth a look.
I of course, could not resist the temptation to do a patent search on
"Inventor = Orville Redenbacher".
Boy was I disappointed.
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