OR.A.M.A > Description
 
  ORAMA 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:
 
  1. Set the design frequency of the array. The design frequency is used to convert lengths from wavelengths into meters or inches and vice versa.
  2. Set the viewing frequency in order to view the radiation pattern of the designed array at different frequencies.
  3. Set the number of sources.
  4. 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.
  5. Choose the array axis.
  6. 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.
  7. 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 method.
  8. 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.
  9. 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.
  10. 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 position.
 
OR.A.M.A - Array Data
 
 
Array Data

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ORAMA Screenshots

     
  b)Excitation coefficients  
  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 coefficients
 
 
Excitation coefficients

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ORAMA Screenshots

     
  c)Main Plot  
  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
 
 
OR.A.M.A - Main Plot

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ORAMA Screenshots

     
  d)Plots  
  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
 
 
Plots

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ORAMA Screenshots

     
  A 3D graph option is also possible by selecting "3D Graph" from the "Graph" menu.
 
OR.A.M.A - 3D Graph
 
 
3D Graph

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ORAMA Screenshots

     
  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.
 
OR.A.M.A - Menu File
 
 
Menu File

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ORAMA Screenshots

     
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