[EU] building materials attenuation coefficients in dB (indoor WiFi) - Page 1
Forum section: electronics / rf-microwave

author: eliocor
author_rank: Unknown
timestamp: October 25, 2018, 06:32:52 pm
content: I'm looking for typical attenuation coefficients (indoor WiFi frequencies) of building materials; something like this:http://www.eiwellspring.org/tech/Shielding_by_building_materials.pdfhttps://ws680.nist.gov/publication/get_pdf.cfm?pub_id=909358but for(SOUTH) EUROPEANbricks/walls/doors/windows/... because to my knowledge measurements, materials and construction methods are a bit different from the North American ones.. TIA

author: E Kafeman
author_rank: Regular Contributor
timestamp: October 26, 2018, 02:03:58 am
content: Just as big difference between buildings in Greek and Nordic countries as building material and style differs a lot.Nordic houses are more isolated from cold by wall material and type of windows.It is more common with metallic heat-isolation for window-glasses, making them almost total RF reflecting at GHz-range. Prefabricated concrete walls instead of hollow bricks. Sometimes inside wall a layer with metallic film for moisture barrier and thicker isolation, typical done with stone wool. It is very common with cell phone coverage problems inside especially building with metallic tinted glasses. even if received signal is good outside of the building.Most attenuation coefficients tables for buildings are old, 50 years or more, done before such windows become popular and due to age do not neither cover any higher frequencies.This document do at least cover WiFi frequencies:ITU-R P.1238-7.https://www.siradel.comis using Young model to simulate multi-path propagation both inside and outside.

author: eliocor
author_rank: Unknown
timestamp: October 26, 2018, 06:57:01 am
content: The reason I'm asking this is because at work I have access toEkahau Site Survey, but I'm unsatisfied of their "material" choices which are not very good for thetypical indoor Italian buildings.If needed I can change attenuation parameters, but first I need to get my hands on good and tested attenuation coefficients!

author: E Kafeman
author_rank: Regular Contributor
timestamp: October 26, 2018, 09:36:49 am
content: Isn't a part of Ekahau that you are expected to create a "fingerprint" or a basic heatmap so that typical local field parameters can be calculated depending on where access points are located? ITU papers are a bit in same direction. Parameters are adjusted depending on measured result for the actual location.Typical Italian indoor environment, is it any typical wall plaster/stone/wood material attenuation or typical amount of absorbing human/furniture in a room that differs from US similar locations?Doubt that a "typical indoor Italian environment" exist.Guess it is much bigger difference depending on age, when building was built, which type of building material that was popular under that period.

author: eliocor
author_rank: Unknown
timestamp: October 26, 2018, 10:08:03 am
content: In Italy construction materials are almost masonry, with very rare usage of wood (not like in northern Europe).In older buildings exterior walls can be in stone (typical upward from 55cm), but I'm interested ONLY in internal building materials.What I'm particularly looking for is attenuation values for typical INTERNAL masonry used in Italy:https://www.google.com/search?q=mattone+forato&client=firefox-b&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwiIovjh6aPeAhVLL8AKHWzOCsYQsAR6BAgFEAE&biw=2880&bih=1526which is RATHER different from the USA or Northern Europe one!I have some tables, but they are for historical buildings built from 800 to 80 years ago*...Regarding the creation of heat maps: sometimes you have no provision to visit the installation site and you have to make a simulation (planning) based only on land registry maps...*) example:https://www.researchgate.net/profile/D_Micheli/publication/269104931_Measurement_of_Electromagnetic_Field_Attenuation_by_Building_Walls_in_the_Mobile_Phone_and_Satellite_Navigation_Frequency_Bands/links/54a1420a0cf256bf8baea896/Measurement-of-Electromagnetic-Field-Attenuation-by-Building-Walls-in-the-Mobile-Phone-and-Satellite-Navigation-Frequency-Bands.pdf