microwave


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microwave,

electromagnetic wave having a frequency range from 1,000 megahertz (MHz) to 300,000 MHz, corresponding to a wavelength range from 300 mm (about 12 in.) to 1 mm (about 0.04 in.). Like light waves, microwaves travel essentially in straight lines. They are used in radar, in communications links spanning moderate distances, and in other applications, such as microwave ovensmicrowave oven,
device that uses microwaves to rapidly cook food. The microwaves cause water molecules in the food to vibrate, producing heat, which is distributed through the food by induction. A special electron tube called a magnetron produces the microwaves.
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. The equipment used to generate, process, and transmit microwaves is in many respects different from that used with lower frequency radio waves. See waveguidewaveguide,
device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. Waveguides, which are useful chiefly at microwave frequencies in such applications as connecting the output
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; magnetronmagnetron
, vacuum tube oscillator (see electron tube) that generates high-power electromagnetic signals in the microwave frequency range. Its operation is based on the combined action of a magnetic field applied externally and the electric field between its electrodes.
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.

microwave

[′mī·krə‚wāv]
(electromagnetism)
An electromagnetic wave which has a wavelength between about 0.3 and 30 centimeters, corresponding to frequencies of 1-100 gigahertz; however, there are no sharp boundaries distinguishing microwaves from infrared and radio waves.

microwave

a. electromagnetic radiation in the wavelength range 0.3 to 0.001 metres: used in radar, cooking, etc.
b. (as modifier): microwave generator

microwave

Meaning "small wave," a microwave is a radio signal in the frequency range from 300 MHz to 300 GHz or from 1 to 300 GHz, depending on the rating system. Except for AM and FM radio, shortwave radio and over-the-air TV, almost all other communications systems transmit microwaves, including satellites, cellular systems, wireless LANs and line-of-sight between buildings and across vast distances. See spectrum and millimeter wave.


Early Microwave Tower
Line-of-sight microwaves were first used to transmit across long distances where the terrain was too difficult to lay cable. This tower was installed in 1969 in Boulder Junction, Colorado. (Image courtesy of AT&T.)
References in periodicals archive ?
Return platter to microwave and cook on medium-high power about 2 to 3 minutes, until cheese is melted.
C*a very useful work and is strongly recommended for larger academic libraries supporting electrical engineering programs and larger special libraries supporting research in RF and microwave engineering.
Next, he exposed half of the rats to microwaves similar to those emitted by cell phones, although the frequency was set at 2,450 MHz, higher than cell-phone frequencies, which are usually between 850 and 1,700 MHz.
With microwaves, researchers can recover gold, silver, copper, and other precious metals, then melt the remainder into "durable glass frits," Oda notes.
He added that people should watch carefully and turn off the microwave if any problem is seen.
Microwaves heat something when a material stops or slows the radiation, causing it to deposit some of its energy.
The freedom to install the appliance in convenient locations throughout the kitchen allows users to safely remove contents from the microwave without the risk of spillage because hot containers are not being lifted overhead, as with many built-in microwaves.
We don't offer recipes for foods that simply do not turn out well,'' Wise and her co-author, Susanna Hoffman, write in ``The Well-Filled Microwave Cookbook'' (Workman; $14.
They can only gauge how the temperature of the cosmic microwave background varies from one relatively large patch of sky to the next.
The new PXI Express-compatible RF and microwave downconverter family complements the wide breadth of PXI modules National Instruments has developed for RF and communications applications, including high-performance IF generators and digitizers that take advantage of the high bandwidth of the PXI backplane.
1 Introducing Microwave Processing of Food: Principles and Technologies.
The compact containment area--not much larger than the part undergoing the process--means the procedure is very energy efficient, does not give off excess heat, and does not require the microwave reactor be kept running as is necessary with a heat-treating oven.

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