The world's first mobile phone is only as big as a dustbin cover, and the signal can only cover about 800 meters. Of course, it is very different from modern mobile phones. Nowadays, mobile phones are small enough to be put in your pocket, and you can get in touch with almost any place in the world through mobile phones. However, Nathan Stubblefield, the inventor of the mobile phone, was not recognized as the father of the mobile phone until he applied for the patent of wireless phone 100 years ago.
The melon farmers devoted all their spare time and every penny to this invention. He made the first telephone equipment in his country house in Murray, Kentucky, USA, and introduced his invention in 1902. He built a 36.5-meter-high antenna in his orchard and used a magnetic field to transmit sound from one mobile phone to another. However, the total number of wires required for the coils in this phone is longer than the wires connecting them, but the invention has the advantage of being movable.
1902 On New Year's Day, the self-taught electrician demonstrated his installation in the public square of the town. Music and sound are transmitted to five receivers. Later, a new version of telephone was designed for carriage, ship and other mobile vehicles, and a patent was applied in 1908. Unfortunately, in his life, the invention of wireless telephone was not commercialized, so 1928 was still poor when he died.
But now there is a book that praises him as the father of modern mobile phones. On the anniversary of his invention, Virgin Mobile website commemorated him with a webpage belonging to him. Sir richard branson, the founder of Virgin Mobile Network, said: "Nathan is the father of mobile phones. His invention is one of the ways to change the way the world communicates. I am very excited to celebrate the centenary of his invention. "
Bob Locke, a journalism professor, is the author of the book "Kentucky Farmers Invent Wireless Phones", published in 200 1. He said that Stubblefield was a pioneer in the mobile industry, but his invention did not bring him enough honor. He said: "It is very difficult to be completely sure that he invented the world's first mobile phone, but he did apply for a patent first. So he probably invented the first mobile phone, but his invention was never put into commercial application. At that time, this invention was very unrealistic. At that time, people had no idea what the future fate of mobile phones would be. "
Stubblefield is a good man. He just wants to use his mobile phone to help local communities connect with each other because these residents are separated by a certain distance. Sadly, Stubblefield didn't sell any mobile phones. Because he is too secretive, his family can't leave the farm without him, and he doesn't want visitors to step into his farm because he is afraid that they may steal his invention.
He has six children, and their family has always been poor, because he spent all his spare money on this telephone experiment. Later, his wife left him, and in the last ten years of his life, Stubblefield lived as a wandering hermit. He died on 1928 and was buried in a grave without a tombstone.
This statement has not been recognized by society so far. The more famous inventor of mobile phone is marty cooper.
1one day in April, 973, a man stood on the street of new york, took out a wireless phone about the size of two bricks and made a call, which attracted passers-by to stop and stare. 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. The other party was also developing a mobile phone at that time, but it has not been successful. Cooper later recalled: "I called him and said,' Joe, I'm talking to you on my mobile phone.' I heard the voice of "gnashing my teeth" on the other end of the phone-although he has always been quite polite. "
Up to now, mobile phones have been born for more than 30 years. This product of the competition of scientific and technological personnel in those days has blossomed everywhere now, which has brought great convenience to our modern life.
Marty cooper is over 80 years old now. 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 applied to the Federal Communications Commission for the requirement that the power of mobile communication equipment can only be 1 watt, and the maximum power cannot exceed 3 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".
Similar-looking mobile phones were born in 1987. Compared with the "shoulder phone", it is much lighter and easier to carry. Nevertheless, it still weighs about 750 grams, which is like a big brick compared with the mobile phone that weighs only 60 grams today.
Since then, the development of mobile phones has become more and more rapid. 199 1 year, and the weight of the mobile phone is about 250g; 1in the autumn of 996, a mobile phone with a volume of 100 cubic centimeter and a weight of 100 gram appeared. Since then, it has been further miniaturized and lightweight, and 1999 has been lighter than 60 grams. In other words, a mobile phone is not much heavier than an egg.
Modern mobile phones have become more and more like a multi-functional Swiss army knife, except for their smaller mass and volume. In addition to the most basic calling function, the new mobile phone can also be used to send and receive emails and text messages, surf the Internet, play games, take photos and even watch movies! This was unexpected by the original mobile phone inventor.
In terms of communication technology, modern mobile phones have also made remarkable progress. When Cooper made the world's first mobile phone, he could use any electromagnetic frequency band. The first generation of analog mobile phones is actually to distinguish different mobile phones of different users by different frequencies. The second generation mobile phone -GSM system distinguishes users with a very small time difference. Today, the frequency resources are obviously insufficient, and the number of mobile phone users is also growing rapidly in geometric series. As a result, the updated CDMA technology came into being, using different codes to distinguish different mobile phones. The mobile phone using this technology not only has better call quality and confidentiality, but also can reduce radiation, which is called "green mobile phone".