Examples of communication Mobile phone=Telephone+SMS+ Radio+TV+Internet+... Wireless communications The theory of electromagnetic waves(radiation) E=号 V.B=0 was formulated by James C.Maxwell in 1864. VxE=-那 Confirmed by Heinrich Hertz in1887. xB=+》 ■ Detection of radio waves was firstly done by Coherer by Oliver Lodge in 1894. （ G.Marconi patented a wireless telegraphy system in 1897. UESTC-Introduction Prof李晓峰 9