Report File on FOLDING ANTENNA
The use of parasitic elements and various
stacking arrangements causes a reduction in the radiationresistance of a
center-fed, half-wave antenna. Under these conditions obtaining a proper
impedance match between the radiator and the transmission line is often
difficult. A convenient method of overcoming thesedifficulties is to use a
FOLDED DIPOLE in place of the center-fed radiator.
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A FOLDED DIPOLE is anordinary half-wave antenna that has one or more additional conductors connected across its ends.Additional conductors are mounted parallel to the
dipole elements at a distance equal to a very smallfraction of a
wavelength. Spacing of several inches is common. The feed-point impedance can
be further increased by using three or four properly spaced parallel conductors.Standard feed-line SPREADERS are used
to maintain this spacing when required. In
any folded dipole,the increase of impedance is the square of the
number of conductors used in the radiator.
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