What is a microwave amplifier? What are the applications?
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Last Update: 2020-04-03
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Source: Internet
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Author: User
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Microwave amplifier is a kind of equipment used to enhance the output power signal of microwave equipment, which usually works by increasing the amplitude or height of the wave directly related to the power stage The specific method is to guide the additional input power to the microwave equipment, so that the microwave radiation can carry more energy This kind of amplifier often works in the low frequency of the radio wave spectrum, with the range of 300 MHz or above It has many uses, such as broadband communication, radar system, military electronic warfare, etc There are many different types of microwave amplifier designs, such as gyrotron, klystron and amplitron In broadband communication, microwave amplifiers are based on transistor technologies such as BJT and FET This amplifier is usually a multistage system, which is used to keep the power of the signal in the case of long-distance transmission In this case, the technology focuses on the efficiency of signal transmission rather than the noise efficiency introduced in the transmission process In addition, although the instability of bias circuit is very common for amplifiers, the development of feedback bias control integrated circuit as a buffer application makes the stability of such microwave amplifiers more reliable in 2011 Gyrotron is a microwave amplifier operating at a higher frequency in the radio spectrum, with a power range from 20 GHz to 35 GHz It is used in the uplink tower, orbital spacecraft, satellite or planetary radar launch system and other special applications Although the concept of gyrotron was put forward as early as the 1950s, the early models could only achieve milliwatt power Russia took the lead in its research and reached the output power level of 22 kW in the late 1970s Klystron and amplifier are another kind of broadband microwave amplifier with similar magnetron characteristics, so they become useful equipment of nuclear accelerator It can generate megawatts of power in 2011, but is usually operated in kilowatts, enabling it to play a role in the same applications as gyrotron Although the amplifier can increase the efficiency rating of microwave equipment by about 70%, it is usually used as the intermediate signal amplifier in the equipment Klystron is a kind of hybrid microwave amplification tool, which can generate low power and high power carrier signals, and has applications in communication system and particle accelerator research The concept of klystron is earlier than that of gyrotron, which was first put forward by Russell and Sigurd brothers of Stanford University The discovery of the two men is believed to have boosted the development of radar systems in the United States and Britain before the outbreak of World War II But during the war, klystron was incorporated into the German radar system, while the Allies relied on stronger magnetron equipment.
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