Indoor Radio Propagation (WiFi)

I can suggest a software of called "AnSys" which is one of the best analysis electromagnetic field. most of people use it.

what rooom do you have to use matel wall?

for anti interference?

if the room is not too big, I think the bst way is test by you and your friends. to find a two positon for the transmitter.

no matter how the software good, it will not as good as test in practise.

Thank You, I will go on the Ansys WebSite to find this product...

This room is like a swimming pool with stainless steel coating.

Hi, Etienne77!

Well, that swimming pool is one good contribution to why you have an effective RF cage. It's not the steel walls per se, it's the ground they get through being in contact with the water supply/drainage (or even possibly the grounding in the electrical system boxed into those walls) that's probably hurting your reception.

The signal hits the conductive metal in the walls and goes directly to ground rather than to a receiver inside.

I've designed and built sound staging where stray RF is absolutely not wanted, and got the result I wanted by just caging it in grounded 1" chicken wire. Nothing gets through, and the even crews inside have to be hard wired to their cameras and sound equipment for good reception.

Mark

If the room approximates to a Faraday Cage, then the best position for the antenna is outside it.

Forget the software. Your description sounds like the room is more like a faraday cage which is designed to block RF transmissions.

There is an old trick used aboard steel ships and similar installations called a "lossy wire" antenna. To get a radio signal into a shielded area you run an antenna wire inside the area or compartment which is very lossy; (meaning not shielded). This permits radio recivers inside the shielded area to pick up the radiated signal. This was a technique used a long time ago but is now pretty much forgotten.

Hi

What is a "lossy wire" Antenna ?

How is it done?
What are these characteristics?

A lossy antenna is a piece of antenna coax with very poor shielding. It is NOT a matched length tuned to the operating frequency and it is open ended, not terminated in a resistor.

Using just a insulated wire may work as long as the wire is not a resonant length.

I have on occasion installed VHF radios plus antenna where the coax shield had so poor coverage that it did not shield against such things as the digital communications devices like GPS sensors. The data pulses were picked up as noise through the coax. Replacing the poor shielded coax solved the problem. Examination revealed the braid only provided something like 60% coverage compared to the 100% coverage in the better quality shielded coax I used as replacement. I doubt you could go a buy "lossy" antenna wire in this day and age. This is a technique from 30 - 40 years ago.

The antenna is mounted to the ceiling or upper wall corner in th eareas to be covered inside the shielded area . I learned about this technique from a company that provided communications pagers in a deep mine. I was told it was also used inside steel hulled ships.