# 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 helix

α = pitch angle

S = loop separation

La = axial length = NR

N = number of turns

L = length of one turn

r = distance between ground plane and helix proper

d = diameter of helix conductor

The inter relations between the parameters are

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