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Helix Antenna

Transient Analysis Examples - Antennas

$image\Helix_Antenna.gif$

General Description

This example shows the S-parameter and farfield calculation of a helix antenna. The antenna is fed by an off centered coaxial line.

Structure Generation

The helix is created by extruding a circular profile (defined by a wire) around a rotational axis. The connection between the inner conductor of the coaxial line (a cylinder) and the helix is made by a sphere. The outer conductor of the coaxial line is a cylindrical hole inside of a ground plane.

Solver Setup

For the excitation a wave guide port at the beginning of the coaxial line is defined. Its reference plane is located at the beginning of the helix. Open boundary conditions are used to simulate the open space around the structure. A farfield monitor at one of the resonance frequencies allows the visualization of the farfield after the simulation.

Post Processing

The scattering parameters and the time signals can be accessed through the 1D Results folder in the navigation tree. In addition, the voltage standing wave ratio is calculated giving information about the impedance mismatch of the antenna over the chosen frequency range. It may be accessed through the navigation tree entry 1D Results VSWR.

The farfield can be found in Farfields farfield (f=0.6) [1].

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