gregorianOffset
Description
The gregorianOffset
object creates a offset Gregorian antenna.
The offset Gregorian antenna is a parabolic antenna. It consists of feed antenna mounted
off-axis to concave 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, to reduce side-lobes and to improve cross polarization. The
offset Gregorian antennas are used in satellite communication ground antennas, radar systems,
and, radio telescopes, etc.
Creation
Description
creates a conical
horn fed offset Gregorian antenna with dimensions for a resonant frequency of 17.76
GHz.ant
= gregorianOffset
creates
an offset Gregorian antenna, with additional Properties specified by one or
more name–value arguments. ant
= gregorianOffset(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.
For example, ant = gregorianOffset(FocalLength=0.04)
creates an
offset Gregorian antenna with the focal length of main reflector set to 40 mm.
Properties
Object Functions
show | Display antenna, array structures, shapes, or platform |
solver | Access FMM solver for electromagnetic analysis |
axialRatio | Axial ratio 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 |
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 |
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 radar cross section (RCS) of platform, antenna, or array |
returnLoss | Return loss of antenna or scan return loss of array |
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