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Foundation ::
Antenna Design and Satellite Communications ::
CWG
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CWG
Mutual Coupling Program for Circular Waveguide-Fed Aperture Array
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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Mutual Coupling Program for Circular Waveguide-fed Aperture Array (CWG) was
developed to calculate the electromagnetic interaction between elements of
an antenna array of circular apertures with specified aperture field
distributions. The field distributions were assumed to be a superposition of
the modes which could exist in a circular waveguide. Various external media
were included to provide flexibility of use, for example, the flexibility to
determine the effects of dielectric covers (i.e., thermal protection system
tiles) upon the impedance of aperture type antennas.
The impedance and radiation characteristics of planar array antennas depend
upon the mutual interaction between all the elements of the array. These
interactions are influenced by several parameters (e.g., the array grid
geometry, the geometry and excitation of each array element, the medium
outside the array, and the internal network feeding the array.) For the
class of array antenna whose radiating elements consist of small holes in a
flat conducting plate, the electromagnetic problem can be divided into two
parts, the internal and the external.
In solving the external problem for an
array of circular apertures, CWG will compute the mutual interaction between
various combinations of circular modal distributions and apertures. CWG
computes the mutual coupling between various modes assumed to exist in
circular apertures that are located in a flat conducting plane of infinite
dimensions.
The apertures can radiate into free space, a homogeneous medium,
a multilayered region or a reflecting surface. These apertures are assumed
to be excited by one or more modes corresponding to the modal distributions
in circular waveguides of the same cross sections as the apertures. The
apertures may be of different sizes and also of different polarizations.
However, the program assumes that each aperture field contains the same
modal distributions, and calculates the complex scattering matrix between
all mode and aperture combinations. The scattering matrix can then be used
to determine the complex modal field amplitudes for each aperture with a
specified array excitation.
CWG carries the NASA case number LAR-15226. It was originally released as part of the NASA COSMIC collection.
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