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 ?
Q: In the event that a microwave system needs repair, what steps should a manufacturer take to ensure their line is up and running again as soon as possible?
The experience obtained from the operation of the analog system was used to establish an outage criteria for the digital microwave system.
The production rate of any microwave system depends on the "loading" of the system in terms of amount of material within the microwave cavity and its degree of microwave receptivity.
In this regard, the FCC emphasized that permitting the sale of excess microwave capacity would obviate the need for others to build redundant parallel microwave systems and would enable smaller business entities to take advantage of the efficiencies inherent in the use of private microwave communications, without the capital expenditures associated with constructing such a system.
and chairman of Columbia Spectrum Management, added: "The PCS licensees and the microwave operators will both benefit from the fastest possible relocation of the microwave systems.
Microwave systems have improved their temperature control and have become easier to use with preprogrammed methods and automated chemical handling features.
Mikael Johannison, head of Sales for Baltic & Central Europe at Saab Microwave Systems, says: "Estonia's selection of Saab for this contract is an important milestone for us in providing tailor-made GBAD (Ground Based Air Defence) systems and will consolidate our position as a world leading supplier of integrated system solutions for ground based air defence.
We believe this will drive demand for Ethernet microwave systems that allow mobile operators to scale their backhaul network beyond a few megabits of T1s and E1s to adding a full fast Ethernet.
Perelman, Vice President, Commercial Sales & Marketing for Times Microwave Systems, "This agreement will help Times to expand into new market segments through Anixter's extensive organization, experience and presence in a broad range of industries.
July 20 /PRNewswire/ -- California Microwave Systems, a unit of Northrop Grumman Corporation (NYSE: NOC) and a leader in military message solutions, has announced the completion of Defense Information Systems Agency Defense Message System (DMS) certification for its Communications Gateway System (CGS) using a company-designed and developed DMS Multi-Function Interpreter (MFI).
STOCKHOLM, Sweden -- Saab Microwave Systems has signed a contract with the Spanish army for ARTHUR Weapon Locating radars, a training simulator and logistics.
The new Northrop Grumman business unit will operate as California Microwave Systems and become part of the company's Electronic Sensors and Systems Sector.

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