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7 Apr 2008 13:53:16 IST

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microwave

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edison

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7 Apr 2008 19:57:39 IST

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Microwaves are electromagnetic waves with wavelengths ranging from 1 mm to 300 mm, or frequencies between 300 megahertz and 300 gigahertz.

SOME MICROWAVE SOURCES ARE

Vacuum tube based devices operate on the ballistic motion of electrons in a vacuum under the influence of controlling electric or magnetic fields, and include the magnetron, klystron, travelling wave tube (TWT), and gyrotron. These devices work in the density modulated mode, rather than the current modulated mode. This means that they work on the basis of clumps of electrons flying ballistically through them, rather than using a continuous stream.

A maser is a device similar to a laser, except that it works at microwave frequencies.

Solid-state sources include the field-effect transistor, at least at lower frequencies, tunnel diodes and Gunn diodes.

ITS APPLICATIONS ARE
1) Radar- communication
2) Broadcasting and recieving signals
3) Navigation
4) MASERS
5) Nuclear Magnetic Resonance (NMR)
6) Microwave ovens for cooking etc.

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