RF Propogation through solid objects

[BharatNT2IE]

Good Morning,

I have a quest about how an RF Wave behaves, when it encounter a solid objects.

I was under the impression, when an RF wave encounter an obstacle (dry wall, metal, body) That the RF wave will pass through the molecules, in the sense because since the electron are randomly and rapidly moving may be the RF Wave permeate through the solid object.

I was also convinced when i was told that when the RF signal can move as such, because of multiple reflections, the chip set can read them .

How about a case when we have our WiFi/4G , signal when we put the phone in a relatively air free environment with a zip ,and the medium is also polyester. In that case as well we still get calls, and we still get WiFi usage.

Please any suggestion or direction in the right train of thought is needed.

Thanks
Bharat C P

 

[MacGyverS2000]

A polyester bag is vastly different than a metal coffee can, even though both are roughly the same thickness. That should tell you enough to point you in the right research direction...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[VEBill]

Additionally, one should never forget that visible light is essentially RF with a very short wavelength. Many a bad conceptual framework can be killed-off by this useful data point.

 

[BharatNT2IE]

Hello,

Thank you for your responses.

So what i understand is that RF Signals cannot pass through solid objects.

Actually i understand the Nylon Clothes or Jeans we put are are not the same thickness as in metal. I was trying to imagine visually what path the RF Signal takes, in an office environment. Let us say the WiFi Routers / eNodes / Basestation are outside of the office. I have my 4G LTE device, in the pocket of my jeans, that has a metal Zip lock and if i recall correct the Wireless Chipset (WiFi / 4G LTE have diversity and main antenna) but they do not protude out. The antennas are in built and they are covered by a Soft plastic case.

If a signal arrives from the Base Station.

Is it going permeate through my jeans.

I am sorry i might be a bit thick .

Thanks
Bharat C P

about light, it think i know what you are talking about higher frequency signals are more susceptible to noise.I do not know i am taking wild swings at this time. Please help

 

[IRstuff]

There are three possibilities, ALWAYS, reflection, transmission, and absorption. For walls, the biggest hit is from absorption:

http://www.wi-fiplanet.com/tutorials/article.php/1431101

http://www.ko4bb.com/Manuals/05)_GPS_Timing/E10589_Propagation_Losses_2_and_5GHz.pdf

TTFN
faq731-376

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[BharatNT2IE]

Thank you IR Stuff,

That is helpful.

Thanks
Bharat C P

 

[MacGyverS2000]

So what i understand is that RF Signals cannot pass through solid objects.

How can you make that statement when you just admitted a phone will continue to accept a signal and ring while in a plastic bag? Do you not consider a sealed plastic bag as a solid object?

Dan - Owner

http://www.Hi-TecDesigns.com

 

[zappedagain]

You can think of a solid object as a dielectric material from the RF point of view, or as having an index of refraction from an optical point of view. Some you will pass through, others you will reflect off.

Z