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[rhn1antenna]

Hi!
In which frequencies are dipole antennas preferred to be used? Is there any diagram in Balanis or Kraus book that explains this?
Thanx!

[bigSteve]

Theoretically they can be used at any frequency.

I think the bulk of the usage for the traditional dipole antenna would be about 20 MHz - 4 GHz. Higher than 4 GHz or so (somewhat arbitrary) the wavelength gets pretty small and more directive antennas are often used to overcome increased pathless. Lower than 20 MHz and a half-wavelength dipole starts to become prohibitively large.

Note that AM car radios use whip type antennas that could be considered a dipole, and these are pretty low frequency (500 kHz or whatever). However the half-wavelength is so large that car antennas are typically very inefficient due to size constraints.

There really are no hard rules for this.

[rhn1antenna]

Thanks Big Steve!