Mobile Phone Development History

If we trace back, we will find that the concept of mobile phone appeared as early as the 1930s, when Bell Laboratories, the largest communication company in the United States, began to trial-produce it. In 1930, Bell Labs produced the first so-called mobile phone. However, because of its large size, researchers can only put it on the shelf of the laboratory, and gradually people forget it.

In April 1973, Martin Cooper, a famous engineering technician of Motorola, invented the world's first mobile phone for civilian use. When Cooper calls the world's first mobile phone, he can use any electromagnetic frequency band. In fact, the first generation of analog mobile phones is to distinguish different users' different mobile phones by different frequencies. The second generation of mobile phones - GSM system is based on extremely small time difference to distinguish users. Today, the frequency resources are obviously insufficient, and the number of mobile phone users is also growing exponentially. As a result, the updated CDMA technology that distinguishes different machines by different codes came into being. Mobile phones using this technology not only have better call quality and confidentiality, but also can reduce radiation, which can be called "green mobile phones".

Development history

In 1831, Faraday in England discovered the phenomenon of electromagnetic induction. Maxwell further elaborated the research results of Faraday and others with mathematical formulas, and extended the theory of electromagnetic induction to space. More than 60 years later, Hertz confirmed the existence of electromagnetic waves in experiments. The discovery of electromagnetic waves has become the turning point from "cable communication" to "radio communication", and also the origin of the whole mobile communication. As one scientist said, "Mobile phones were born on the shoulders of telegrams and telephones. Without the efforts of predecessors, wireless communication would be impossible.

May 24, 1844 [4]. Morse's telegraph machine sent the first telegram in human history from Washington to Baltimore, "What a miracle has God created!"

On June 2, 1875, Bell accidentally splashed sulfuric acid on his leg while doing experiments. He was so painful that he shouted to his colleague in the other room, "Hurry to help me, Hurry!" and this sentence passed through the telephone in the experiment to the telephone in the other room, which became the first sentence of human transmission through the telephone.

In 1902, an American named "Nathan Stabfield" made the first wireless telephone device in a rural house in Murray, Kentucky. This wireless mobile phone is the earliest exploration and research of "mobile phone" technology.

In 1940, Bell Laboratories of the United States produced mobile phones in the field.

In 1946, the world made the first call from a moving car in St. Louis.

In 1957, Leonid, the outstanding engineer of the Soviet Union. Kupriyanovich invented ЛК- Type 1 mobile phone. In 1958, he had made further improvements to his mobile phone. The weight of the device has been reduced from 3 kg to 500 g (including the weight of the battery), and its shape has been reduced to the size of two cigarette packs. It can be dialed anywhere in the city, and can be connected to any fixed telephone. By the early 60 years, Kupriyanovic's mobile phone had been able to work effectively within 200 kilometers.

In 1958, the Soviet Union began to develop the world's first fully automatic mobile phone communication system "Altay"（ Алтай)  [8]  。 In 1959, the "Altai" system with outstanding performance won the gold medal at the Brussels World Expo.

Martin Cooper

Martin Cooper

In 1973, a man stood in the street of New York, pulled out a wireless phone about the size of a brick, and began to talk. This person is the inventor of mobile phone Martin Cooper. At that time, he was also an engineering technician of Motorola. This was the first mobile phone in the world at that time [9].

In 1975, the Federal Communications Commission (FCC) of the United States determined the spectrum of terrestrial mobile telephone communications and large-capacity cellular mobile phones. It is ready for the commercial use of mobile phones.

In 1979, Japan opened the world's first cellular mobile phone network.

In 1982, GSM (Mobile Communication Task Force) was established in Europe.

In 1985, the first commercially available mobile phone in the modern sense was born. It is to put the power supply and antenna in one example, with a weight of 3 kg.

Mobile phones, which are similar to modern shapes, were born in 1987. Its weight is still about 750 grams, which is like a big brick compared with the mobile phone weighing only 60 grams today.

Since then, the "slimming" of mobile phones has become more and more rapid. In 1991, the weight of mobile phones was about 250 grams. In the autumn of 1996, mobile phones with a volume of 100 cubic centimeters and a weight of 100 grams appeared. Since then, it has been further miniaturized and light, and by 1999 it has been less than 60 grams.