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New Standards for Wireless LANs

New Standards for Wireless LANs

Transmission of

Transmission of Electromagnetic Waves • 1831: Faraday demonstrates magnetic induction • 1865: Maxwell theory of electromagnetic fields, wave equation • 1876 Patent on phone, Alexander Graham Bell (Antonio Meucci 1849) • 1888: H. Hertz: demonstrates the wave character of electrical transmission through space • Nikola Tesla extends the transmission range Pics from www.wikipedia.org - 12 - TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

History of Wireless Communication • 1895 Guglielmo Marconi – first demonstration of wireless telegraphy (digital!) – 1901 transatlantic transmission – long wave transmission, high transmission power necessary (> 200kW) • 1907 Commercial transatlantic connections – huge base stations (30 100m high antennas) • 1915 Wireless voice transmission New York - San Francisco • 1920 Discovery of short waves by Marconi – reflection at the ionosphere - 13 - Foto from www.wikipedia.org – smaller sender and receiver, possible due to the invention of the vacuum tube (1906, Lee DeForest and Robert von Lieben) TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

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