- Reflector Antennas
Reflector antenna current distribution
Reflector antennas are typically used when very high gain (e.g. satellite transmission or reception) or a very narrow main beam (e.g. secure communication) is required. Gain is improved and the main beam narrowed with increase in the reflector size. Large reflectors are however difficult to simulate as they become very large in terms of wavelengths.
FEKO is well suited to the simulation of reflector antennas and provides the following relevant techniques:
- Multilevel Fast Multipole Method (MLFMM): This is an efficient
version of the MoM, suited to multi-wavelength structures. This
full-wave method yields very accurate results.
- Physical Optics (PO): The PO high frequency approximation can be
used to approximate current flow on the reflector. This technique is
generally computationally inexpensive. It is most suited when the feed
can be considered decoupled from the reflector. Large element PO
(LE-PO) is particularly efficient for reflector antenna modelling.
Continuous current flow can be modelled from standard MoM regions to PO
- Ray launching Geometrical Optics (GO): This is another high frequency approximation method. The GO is even less expensive than the PO. It can take multiple reflections into account at little cost. It is based on shooting and bouncing rays.
- Uniform Theory of Diffraction (UTD): Computational cost is independent of reflector size, but only flat plates can be considered.
To keep computational costs down further, domain decomposition can be used. The feed antenna is simulated in isolation and the result is then used to replace it with an equivalent source (e.g. radiation pattern or spherical mode point source) when simulating the reflector.
Near-field phase fronts in front of reflector antenn
- Multilevel Fast Multipole Method (MLFMM): This is an efficient version of the MoM, suited to multi-wavelength structures. This full-wave method yields very accurate results.
- Reflector Antennas
- Cassegrain and Gregorian Reflector Antenna Modelling with MLFMM LE-PO Hybrid Solvers (Mr Ernst Burger) Oct 06, 2014
- Crossed Dipole Array in Front of Reflector (Mr Andre Young) Nov 11, 2015
- Horn-Fed Reflector Antenna (Mr Andre Young) Sep 22, 2010
- Printed Ka-band Reflectarray with Offset Feed (Ms Madele van der Walt) Jul 23, 2015
- Reflector Antenna with Circular Horn Feed, Analysed with GO (Ray Launching) (Prof. Matthys Botha) Oct 03, 2013