1893, nikola tesla publicly demonstrated radio communication for the first time in St. Louis, Missouri, USA. He described and demonstrated the basic principles of radio communication in the reports of Franklin College in Philadelphia and the National Electric Light Association. The instrument he made contains all the basic components of the radio system before the invention of the electron tube.
1895 On May 7th, alexander popov showed his radio receiver-lightning indicator, which was later celebrated as "Radio Day" in Russia. Russians think he is the inventor of radio.
Guillermo Marconi holds the British patent number, which is widely regarded as the world's first patent on radio technology. 12039, "improvement of electric pulse and signal transmission technology and required equipment".
Nikola tesla obtained the American radio technology patent in 1897. However, in 1904, the US Patent Office revoked its patent right and granted Marconi a patent for inventing radio instead. This move may be influenced by Marconi's economic supporters in the United States, including Thomas Edison and andrew carnegie.
1909 Marconi and karl ferdinand braun won the nobel prize in physics for inventing wireless telegraph.
1898, Marconi opened the world's first radio factory in Hall Street, chelmsford, England, with about 50 employees.
1943, shortly after Tesla's death, the US Supreme Court re-affirmed Tesla's patent. This decision admitted that his invention had been completed before Marconi's patent. Some people think that this decision is obviously for economic reasons. In this way, the US government in World War II can avoid paying royalties to Marconi's company.
Extended data:
radio communication
The greatest charm of radio communication is that people can transfer information by means of the fluctuation of radio waves, saving the trouble of laying wires and realizing more free, fast and barrier-free information exchange and communication. From the characteristics of radio waves, like light waves, radio waves can be reflected, refracted, diffracted and scattered.
Due to the different characteristics of radio waves, some radio waves can travel on the surface of the earth, some can travel in a straight line in space, some can reflect from the atmosphere, and some can even penetrate the atmosphere and fly to distant space.
References:
Baidu encyclopedia-wireless communication