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HELICAL ANTENNA & its Specifications
Helical antenna is an antenna which has a helix or spring shape. Its polarisation and radiation properties depend on the diameter, pitch, number of turns, wavelength, excitation and spacing between the helical loops.
Helix Antenn Design and Construction Details
A typical structure of helical antenna is shown in
It consists of helical loops made of a thick conductor which have the appearance of a screw thread. It is associated with a ground plane made of the conductor. The ground plane is often made of screen or sheet or of radial and concentric conductors. This antenna is fed by a coaxial cable. This can be operated in normal and axial modes. The common antenna parameters are:
C = circumference of
= pitch angle
S = loop separation
axial length = NR
N = number of
L = length of
r = distance
between ground plane and helix proper