is written under Windows 98/Me/NT/2000 operating system.
It has been designed as a Windows MDI application so that
multiple array designs can be performed simultaneously.
The minimum hardware requirements are a Pentium at 90MHz
or higher with 16MB of RAM and about 2MB of hard disk
space. There are four tabs:
a) Array Data
The array data tab can
be used to enter all the data necessary for the description
of the antenna. The user has the following options:
Set the design frequency of the array. The design
frequency is used to convert lengths from wavelengths
into meters or inches and vice versa.
Set the viewing frequency in order to view the radiation
pattern of the designed array at different frequencies.
Set the number of sources.
Set the inter-element distance, if elements abstain
equally. This edit box is disabled if elements abstain
unequally. In order to view or change mean distance
in meters or inches the user can select the appropriate
unit from the dropdown list box at the right side
of the edit box.
Choose the array axis.
By Clicking the button Select Case,
or by pressing the F8 key, or by selecting
the menu Options | Design Case will
bring up a dialog box from which the user can choose
one of the built-in design cases. They have been selected
in a way suitable to provide a great variety of desired
factors, and have been parameterized to allow additional
degrees of freedom. There is variety of desired factors,
which have to do with most of the practical design
cases. Clicking for example the Chebyshev /Legendre
case, a great variety of the above patterns will be
presented. Clicking one of the patterns all the desired
details and the constraints will be presented.
The button Select Method will bring
up a dialog box which is used for the selection of
the method of calculation. The calculations can be
made using orthogonal or the orthogonal perturbation
The button Calculate, the menu Calculate,
or by pressing the F9 key will perform
all the calculations needed and will bring up the
Plots tab. In the case of orthogonal perturbation
the user has to enter additional informations.
The following elements are supported: isotropic
sources, small dipoles, small crossed dipoles, finite
length dipoles, finite length crossed dipoles, horns
(Pyramidal and Conical) and microstrip patches (Rectangular
and Circular) . Additional informations for the element
type characteristics is required in most of the above
cases. The user can also enter a custom element type.
The use of a plane reflector in the array design
is also possible. From the Menu "Options"
the user selects "Reflector..". Then a dialog
box appears and the user has to choose the reflector
OR.A.M.A - Array Data
In the excitations coefficients
tab the coefficients for each array element are shown.
The user has the option of viewing the excitations coefficients
in rectangular or polar form .In the case of polar form
the phase can be shown in degrees or radians.When the
checkbox "Allow manual change of currents" is
checked then the user can change the excitations coefficients
and view the results in the plots tab.
OR.A.M.A - Excitation
On Main Plot
tab the pattern plots are shown enlarged, one plane at
a time. The user has many options to customize the plot
view. The description of the most significant options
follows below.The plane of the plot can be selected or
even entered through the angle phi. The option of plotting
the total factor, the element or the array factor is also
possible. The graph can be viewed in either polar or rectangular
form. The graph can be zoomed in by checking the "Edit
Plot" checkbox and by selecting the area to zoom
in with the mouse.
OR.A.M.A - Main Plot
On the Plots
tab the array patterns and the array indices at four planes
are shown. The planes shown on the Plots tab
are xy, yz, xz, and a constant phi cut on a user definable
plane (the default is phi=45o).
OR.A.M.A - Plots
A 3D graph option is also
possible by selecting "3D Graph" from the "Graph"
OR.A.M.A - 3D Graph
Additional useful operations
exist in Menu "File" . The user can save ,open
or close an array design. The Main plot can be saved as
a Windows bitmap file. The pattern data of the main plot
can also be saved in ASCII format. The current array data
in the main plot can be printed to every Windows compatible
printer through menus "Print Numerical Results.."
and "Print Main Plot.." respectively.