Abstract: The potential implementatio n o f wi reless radio local area netw orks and perso nal communication services inside building requi re a tho roug h understanding o f sig nal pro paga tion in a building. In thi s paper an in-building penet ra tion lo ssmeasurement s at 2. 4 GHz ( the ISM band) hav e been presented fo r materials used in indo or env iro nment s. To o btain the data, measurement s w ere perfo rmed a t 160 MHz bandw idth centered in 2. 4 GHz using v ecto r netw ork ana lyzer. These measurements may aid in the dev elopment o f future in-building w ireless netw o rks in this band.

Key words: indoor radio propagation, penetration loss