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# What exactly is a waveguide?

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#### sumant.thapliyal

##### Banned
what is wave guide

Re: what is wave guide

sumant.thapliyal said:
what is wave guide

A material which can guide wave.

Re: what is wave guide

Waveguide is a physical structure which guides electromagnetic waves. Waveguide size and its material depend on the frequency. Waveguides can be constructed from either conductive or dielectric materials.

CMIIW

Br,

Re: what is wave guide

Hi sumant.thapliyal,

The two-wire transmission line used in conventional circuits is inefficient for
transferring electromagnetic energy at microwave frequencies. At these
frequencies, energy escapes by radiation because the fields are not confined in
all directions.

Waveguides are the most efficient way to transfer electromagnetic energy.
WAVEGUIDES are essentially coaxial lines without center conductors. They
are constructed from conductive material and may be rectangular, circular, or
elliptical in shape.

Re: what is wave guide

I guess 2 wire transmission line is also a waveguide provided it excites a single mode on it.
And at higher (microwave) frequencies it is skin effect phenomenon casuing loss of energy in coaxials...so we switch to hollow waveguides...
Is is what Balaguru you are saying...? Am I right...?

Re: what is wave guide

A waveguide is basically something that guides a wave. When a wave is received from outer space, or some other source, we need to send it in a particular direction to our circuit or other region of interest for further study. Using the boundary conditions of Electric and magnetic fields, the waveguide can be designed to break up the received wave into particular modes and polarizations for further study...

See David Cheng, "ElectroMagnetics," or Simon Ramo, "Wireless Communication" for a more mathematical derivation. If you are really feeling good about yourself, look up "Electrodynamic" by Jackson.

Re: what is wave guide

it's use is somewhat similar to a coax but for RF signal.

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