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 ?
Based on the results we've seen using miraWave it's clear that microwave energy has a role to play in the long term hair reduction space," said Dr.
Conversion of the microwave energy into thrust was performed using a thermal thruster with a highly efficient microwave-absorbing heat exchanger.
The M-Wave prototype features a hybrid approach that uses both thermal and microwave energy.
In this process, microwave energy was used to break the S-S and S-C bonds while leaving the C-C bonds intact (de-vulcanize but not de-polymerize).
Given the characteristics of the materials commonly used in pharmaceutical production (Table I), microwave energy is particularly well suited for the drying of pharmaceutical formulations.
Estimations regarding the microwave generator used for the plant are based on the average microwave energy needed to treat the core (60 kWh/[m.
The absorption of microwave energy is proportional to the concentration of these free radicals," he said.
In some cases, the use of microwave energy allows for the creation of new synthesis pathways that were previously difficult or impossible to achieve.
The new process, which uses radio-frequency energy to generate the plasma, costs less than a competitive PECVD system that uses microwave energy, according to William Liggett, Nano Coating's president and CEO.
Alternative technologies that create rapid and uniform heating, such as microwave energy, could help overcome these problems.
Multiple magnetrons are used to generate the microwave energy, and it's not unusual to find 2.
Sulphur Mountain homeowners have been fighting to remove the Doppler radar weather station since it was installed in 1993, saying they were concerned about the potential health hazards of living near an antenna that emits about 750,000 watts of microwave energy.

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