Inventors of Radio


James Clerk Maxwell

Heinrich Hertz
Hughes
Willaim Crooke



Édouard Branly
France
23 October 1844 – 24 March 1940
https://en.wikipedia.org/wiki/%C3%89douard_Branly


Nikola Tesla
Croatia
10 July 1856 – 7 January 1943
https://en.wikipedia.org/wiki/Nikola_Tesla


Roberto Landell de Moura
Brazil
January 21, 1861 – June 30, 1928
https://en.wikipedia.org/wiki/Landell_de_Moura


Oliver Lodge
England
12 June 1851 – 22 August 1940
https://en.wikipedia.org/wiki/Oliver_Lodge



Jagadish Chandra Bose
India (Bangladesh)
30 November 1858 – 23 November 1937


Alexander Stepanovich Popov

Russia
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.


Julio Cervera Baviera

Spain



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.


Guglielmo Marconi

25 April 1874 – 20 July 1937

Italy & Britain

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.

Karl Ferdinand Braun

Germany

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.


John Stone Stone

USA

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.


Reginald Fessenden

Canada

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.


John Ambrose Fleming

England

29 November 1849 – 18 April 1945

Invented (or at least made practical) the two-electrode vacuum-tube rectifier, also called a thermionic valve, vacuum diode, or  thermionic tube.

Lee de Forest

USA

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.




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