作者YouNeverWin (Paris, Je T'aime)
看板comm_and_RF
標題[心得] RF history
時間Mon May 18 13:57:21 2009
1864 – Maxwell’s Equations: theoretical basis for electromagnetic waves
1888 – Heinrich Hertz produced and detected RF electromagnetic waves
1893 – Nikola Tesla demonstrated the feasibility of wireless communications
1897 – Marconi built first radio station on Isle of Wight
1906 – First radio program broadcast
1908 – First wireless phone patent issued
1920 – First radio news program
1928 – First television broadcast
1945 – “0G” mobile phones introduced – These were not “cellular”
1947 – Cellular basestations invented for military communications
1954 – Pocket transistor radio produced
1963 – TELSTAR (radio communications satellite) launched
1970 – First wireless computer network developed
1973 – Motorola invented first handheld mobile phone
1979 – Introduction of “1G” analog cellular systems
1984 – First US cellular phone approved by FCC
1987 – GPS system launched
1991 – First “2G” system launched (GSM)
1999 – Wireless LAN became commercially available
2001 – First “3G” system launched (WCDMA/FOMA)
Today – Continued Roll Out of 3G, Planning for 4G and Beyond
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我渴望能見你一面,但請你記得,我不會開口要求要見你。
這不是因為驕傲,你知道我在你面前毫無驕傲可言,
而是因為,唯有你也想見我的時候,我們見面才有意義。
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