Microwave knowledge
Microwave and characteristics
Microwave and characteristics
Microwave is the frequency of about 300MHz-300GHz, ie 100cm to 1mm wavelength range of electromagnetic waves, which is located in the electromagnetic spectrum of infrared radiation (light), and radio waves. Therefore, it can deal with electromagnetic waves and electromagnetic theory and microwave-related problems, especially microwave propagation in space and its interaction with matter. In real life, it is actually applied these principles to solve some problems, even with these principles developed products, such as microwave oven, and then there sterilization machine, drying machine, dryer and other microwave devices. However, since the wavelength of the microwave components with the use of similar size, so commonly used in the electronics of the printed circuit is not used. Here, a coaxial cable can be used, a hollow metal tube waveguides, resonant cavity klystron and magnetron. Microwave is a very special electromagnetic spectrum, although it ranged between radio waves and infrared radiation. But can not alone be low frequency and high frequency radio waves to promote the concept of infrared radiation approaches derived microwave generation, transmission and application of the principle. For example. According to the principle of low-frequency radio waves, a hollow metal tube will not transmit microwave waveguide. Because security according to these principles, in the opposite direction of the current will not be simultaneously in the same piece of metal and not merged into a single direction in the flow of current. However, the microwave, but it can be observed in the opposite direction does the current flow in the same conductor waveguide. Similarly, although the light can propagate in the hollow tube, but the light was not like a microwave coaxial cable that propagate along the dryer.
In addition to the microwave transmission through the waveguide or coaxial cable, you can also use some of its focus into the antenna beam passage transmission, which has been widely used in radar, communications and electronic warfare.
Under normal conditions, the microwave can easily penetrate certain materials, such as glass, ceramics, certain plastics (such as polytetrafluoroethylene), etc. Therefore, the authors of these materials are available with microwave cookware, brackets and window materials. Can also be a number of microwave dielectric materials, such as water, carbon, rubber, food, wood and paper wet absorption generates heat so. Microwave can also be used as an energy source in the consumer, industrial, scientific, and other widely applied in many fields. The microwave power is not part of a class of communication with the microwave power.
Microwave band at 125cm wavelength band dedicated to radar, and the rest used for telecommunications transmission, in order to prevent the microwave power to radio communications, radio, television and radar cause interference, the international regulations: scientific, medical and household, etc. civilian band microwave power to be different. As we all know, since the 1930s, the emergence of microwave tubes and technological breakthroughs, so closely associated with microwave technology during World War II radar technology with rapid development. At that time, the war either party in the progress of microwave technology side and will give the enemy a severe blow. The cruel reality of war and combat cross party consensus intense competition has greatly promoted the plant actually microwave communications in the broad field of military science applications. Found that the thermal effect of microwave, the microwave energy as a non-communication is widely used in industry, agriculture health care, scientific research and even family is the first thing after the end of the First World War. 1945 Raytheon UK researchers found that microwave heating effect, which developed two years later they became the world's first - Taiwan using microwave heating food "radar furnace." Today, the domestic microwave oven in the U.S. penetration rate has reached 80%, and annual sales of over 12 million units. Characteristics of the microwave heating effect is generated simultaneously at different depths heat, this "heating of the body", not only the heat more quickly. And more uniform, thus greatly reducing the time required for material handling. Saving valuable energy, but also improve the quality of heating to maintain the nutritional content of food to prevent material useful (active) component damage and loss. Because of this, the government recently it has been widely used in paper, wood, leather, tobacco and even herbal drying. Microwave sterilization can also be used insecticide, which in medicine and food industry is widely available in the biomedical aspects of the microwave can be used to diagnose place (such as a tumor) and treatment (such as sudden deafness, pain, rheumatoid arthritis, shoulder inflammation, certain types of cancer) diseases, tissue fixation, immunohistochemistry and immunocytochemistry studies, microwave in other fields more and more widely, a good prospect.
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