How did Americans invent mobile phones and computers? Why did they invent mobile phones and computers?

1 and1one day in April 1973, a man stood on the street in new york, took out a wireless phone the size of two bricks and made a phone call, which attracted passers-by to stop and stare at him. This man is marty cooper, the inventor of mobile phone. At that time, Cooper was an engineer of the famous Motorola company in the United States.

The first mobile phone in the world was called to an opponent who worked in Bell Laboratories. Marty cooper is 74 years old. After working in Motorola for 29 years, he founded his own communication technology research company in Silicon Valley. He is currently the chairman and CEO of this company. Marty cooper's idea at that time was to let the media know that wireless communication, especially small mobile phones, was very valuable. In addition, he also hopes to arouse the interest of the Federal Communications Commission, and AT & amp； t(AT & amp； T is also a big communication company in the United States) and can support the former.

In fact, going back, we will find that the concept of mobile phone appeared as early as 1940s. At that time, the trial production was started by Bell Laboratories, the largest communication company in the United States. 1946, Bell Laboratories manufactured the first so-called mobile phone. But because of its large size, researchers can only put it on the shelf in the laboratory, and people will gradually forget it.

Until the end of 1960s, in&; Two companies, T and Motorola, became interested in this technology. At that time, at & amp； T Rent a large mobile radiotelephone, which customers can install on the truck. At&T Company. T's vision is to develop a mobile phone with the power of 10 watt in the future, and use the radio equipment on the truck to communicate. Cooper thinks this kind of mobile phone is too big and heavy to move and carry. Therefore, Motorola filed an application with the Federal Communications Commission, requesting that the power of mobile communication equipment can only be one watt, and the maximum power cannot exceed three watts. In fact, the maximum radio power of most mobile phones today is only 500 MW.

From 1973 to 1985, the first modern mobile phone was born. It puts the power supply and antenna in a box, weighing 3 kilograms, which is very heavy and inconvenient. Users must carry it like a backpack, so it is called a "shoulder phone".

2. In June, Compaq launched a notebook computer 1982 1 1, weighing 28 pounds (about 14 kg), which should be regarded as the earliest prototype of a notebook computer. However, IBM refuses to accept this statement, insisting that a notebook computer named PC Convertible developed in 1985 is the real "originator" of notebook computers.