A talented entrepreneur who undertook many original investigations into radio wave transmission and reception and brought together much earlier work and contemporary work together to produce a complete practical wireless telegraphy system. He is widely credited as inventing wireless telegraphy, but in reality he was not alone in that.
James Clerk Maxwell
23 October 1844 – 24 March 1940
10 July 1856 – 7 January 1943
Roberto Landell de Moura
January 21, 1861 – June 30, 1928
12 June 1851 – 22 August 1940
Jagadish Chandra Bose
30 November 1858 – 23 November 1937
March 16 1859 – January 13 1906
In a March 24 1896 he used radio waves to transmit a message between different campus buildings in St Petersburg.
26 January 1854 – 24 June 1927
Marconi demonstrated the effectiveness of the wireless telegraph in December 1901, but did not produce radios until 1913. Cervera, worked with Marconi and his assistant George Kemp in 1899, and resolved the difficulties of wireless telegraph and obtained his first patents prior to the end of that year.
25 April 1874 – 20 July 1937Italy & Britain
6 June 1850 – 20 April 1918
Major contributions were the introduction of a closed tuned circuit in the generating part of the transmitter, and its separation from the radiating part (the antenna) by means of inductive coupling, and later on the usage of crystals for receiving purposes.
September 24, 1869 – May 20, 1943
In 1899, through his insight into the difficulties facing the embryonic technology of radiotelegraphic signalling, he recognized that his own earlier work on resonant circuits on telephone lines could be applied to improve radio transmitter and receiver designs.
October 6, 1866 – July 22, 1932
In the late 1890s, Fessenden began limited radio experimentation, and concluded that he could develop a far more efficient system than the spark-gap transmitter and coherer-receiver combination which had been championed by Oliver Lodge and Marconi.
Fessenden made major advance in receiver design, and this work was quickly and widely adopted. He also developed the heterodyne principle,
which was later refined into the super-heterodyne.
29 November 1849 – 18 April 1945
August 26, 1873 – June 30, 1961
Developed significant improvements to the Marconi wireless telegraphy system. He inventied the three-element "Audion" (triode) vacuum tube, the first practical amplification device, and numerous other innovations that made radio-communications more useful and effective.