cassegrainOffset
Description
The cassegrainOffset
object creates an offset Cassegrain
antenna. The offset Cassegrain antenna is a parabolic antenna, where the feed antenna is
mounted off-axis to convex sub reflector and concave main reflector. The asymmetric
arrangement of reflectors provides less blockage for waves redirected from main reflector. The
advantage of these antennas is high gain, reduced sidelobes and improved cross polarization.
The offset Cassegrain antennas are used in satellite communication ground antennas, radar
systems, and, radio telescopes among other applications.
Creation
Description
creates a
conical-horn-fed offset Cassegrain antenna with dimensions for a resonant frequency of
17.8 GHz.ant
= cassegrainOffset
creates an offset Cassegrain antenna, with additional Properties specified by one or
more name–value arguments. ant
= cassegrainOffset(Name=Value)Name
is the property name and
Value
is the corresponding value. You can specify several
name-value arguments in any order as Name1
=
Value1
, ...
,
NameN
=ValueN
. Properties not specified retain
their default values. sets Properties using one or more
name-value pairs.
For example, ant = cassegrainOffset(FocalLength=0.04)
creates an
offset Cassegrain antenna with the focal length of the main reflector set to 40
mm.
Properties
Object Functions
axialRatio | Calculate and/or plot axial ratio of antenna or array |
bandwidth | Calculate and/or plot absolute bandwidth of antenna |
beamwidth | Beamwidth of antenna |
charge | Charge distribution on antenna or array surface |
current | Current distribution on antenna or array surface |
design | Design prototype antenna or arrays for resonance around specified frequency or create AI-based antenna from antenna catalog objects |
efficiency | Radiation efficiency of antenna |
EHfields | Electric and magnetic fields of antennas or embedded electric and magnetic fields of antenna element in arrays |
impedance | Input impedance of antenna or scan impedance of array |
info | Display information about antenna, array, or platform |
memoryEstimate | Estimate memory required to solve antenna or array mesh |
mesh | Mesh properties of metal, dielectric antenna, or array structure |
meshconfig | Change meshing mode of antenna, array, custom antenna, custom array, or custom geometry |
optimize | Optimize antenna or array using SADEA optimizer |
pattern | Plot radiation pattern and phase of antenna or array or embedded pattern of antenna element in array |
patternAzimuth | Azimuth plane radiation pattern of antenna or array |
patternElevation | Elevation plane radiation pattern of antenna or array |
rcs | Calculate and plot monostatic and bistatic radar cross section (RCS) of platform, antenna, or array |
resonantFrequency | Calculate and/or plot resonant frequency of antenna |
returnLoss | Return loss of antenna or scan return loss of array |
show | Display antenna, array structures, shapes, or platform |
solver | Access FMM solver for electromagnetic analysis |
sparameters | Calculate S-parameters for antennas and antenna arrays |
vswr | Voltage standing wave ratio (VSWR) of antenna or array element |
Examples
More About
References
[1] Granet, C. “Designing Classical Offset Cassegrain or Gregorian Dual-Reflector Antennas from Combinations of Prescribed Geometric Parameters.” IEEE Antennas and Propagation Magazine 44, no. 3 (June 2002): 114–123.
Version History
Introduced in R2021a