Martin Cooper

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Martin Cooper (2007)

Martin Cooper (born December 26, 1928 in Chicago ) is an American electrical engineer. He is considered to be the inventor of the cell phone .

Cooper graduated from the Illinois Institute of Technology . He is the CEO and founder of ArrayComm. Previously, he worked in research and development at Motorola . He made the first call on April 3, 1973 on 6th Avenue in New York about a mobile phone prototype developed and built together with Rudy Krolopp at Motorola, with which he called his rival at Bell Labs . On October 17, 1973, he filed his patent for a radio / telephone system, which was granted on September 16, 1975. He is therefore considered to be the inventor of the modern cell phone.

In 1995 Cooper received the Wharton Infosys Business Transformation Award for its technical innovations in the field of communication , in 2009 the Prince of Asturias Prize in the science and research category together with Ray Tomlinson, and in 2013 the Charles Stark Draper Award together with four other people. Price . Also in 2013 he was awarded the Marconi Prize ; for 2015 he was awarded the IEEE Masaru Ibuka Consumer Electronics Award .

Cooper is a member of Mensa .

Cooper's Law

Cooper's Law on Spectral Efficiency comes from Martin Cooper . Since the beginning of the 20th century, the number of possible radio channels has doubled at each location within 30 months. When Guglielmo Marconi radioed Morse signals across the Atlantic in 1901, he blocked a large part of the radio spectrum that could be used at the time . At this point in time, there could only have been 50 wireless connections worldwide without interfering with one another. This number has increased significantly due to several causes:

  • The usable spectrum has expanded very strongly to ever higher frequencies, and new frequency bands have always been usable.
  • New modulations allow better spectral efficiency , i.e. more channels with a fixed bandwidth.
  • The required range and thus the output power of the transmitter is reduced. This means that the same frequency can be used again at a shorter distance.

This growth will reach its limits in extremely dense radio networks.

Web links

Commons : Martin Cooper  - Collection of Images, Videos and Audio Files

Individual evidence

  1. ↑ Erik Gregersen: Martin Cooper. American engineer. Encyclopædia Britannica , February 14, 1014, accessed October 13, 2015 .
  2. ↑ Article Focus: Cellular: I did it there.
  3. ↑ Maggie Shiels: BBC interview with Martin Cooper . In: BBC News , April 21, 2003. 
  4. ^ Bob Greene: 38 Years Ago He Made the First Cell Phone , 2011 Cable News Network. Retrieved March 21, 2012. 
  5. ^ Gareth Marples: The History of Cell Phones . Retrieved March 23, 2012.
  6. ↑ Cooper et al .: U.S. Patent 3,906,166 dated September 16, 1975 in Google Patents, accessed June 25, 2013.
  7. ↑ The ancestor of cell phones: Motorola Dynatac 8000X. News from Focus dated September 21, 2008.
  8. ↑ ArrayComm: Cooper's Law. May 26, 2011, accessed on September 21, 2018 .
  9. ↑ Jeffrey G. Andrews, Xinchen Zhang, Gregory D. Durgin, Abhishek K. Gupta: Are We Approaching the Fundamental Limits of Wireless Network Densification? (PDF) May 28, 2016, accessed on September 21, 2018 (English).
personal data
SURNAME Cooper, Martin
BRIEF DESCRIPTION American electrical engineer
DATE OF BIRTH December 26, 1928
PLACE OF BIRTH Chicago