construction of waveguide

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Design of horn communication antenna for microwave
Made by Abhijeet Singh Chouhan B.TECH VIII
Semester, D3 2014
Guide Prof. Pradeep Sharma
2
Content

• Construction of Waveguide
• Construction of Flare
• Created Union Aperture
• Create a Port
• Add Excitation Frequency
• Add Far Field Near Field
• Create Symmetry Mesh

3
Construction of Waveguide

• Select the cuboids'(base centre, cm)

Width 2.5
Depth 1.2
Height 3.8
label waveguide
4
Construction of flare
Height 12
Top width 6.5
Top depth 5.5
5
The created flare and swept rectangle now need to
be unioned.

• Select the flare and the cuboid in the tree and
  click on the Union button (Modify
  group).

• The next step will to be delete the faces set
  between Flare1 and Pathsweep1.

• Now we create aperture GO TO
• 1 TOOLS
• 2 SELECTION TYPE
• 3 FACES

6
Right-click on the respective face and select
Delete from the context menu. Also delete the
outer face of the flare.

• Displayed in the image are the faces that are to
  be deleted.

• The horn should now look as displayed.

7
Create the Port
Go to tree 1 Right Click on Create Port . 2
Waveguide Port. 3 Select the Back faceport
from 3D view named Union1.Face2 in dialog box. 4
Add and close dialog box
PORT
8
Add Excitation to the Port
A port(back face) is simply a connection point
for loads and excitations.
1 Right click on Excitation 2 Select Waveguide
excitation 3 Use Default Setting 4 Add Close
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Frequency
1 Right click on the frequency 2 Select the
Frequency(2e9)

• NEAR FIELD
• 1 Right click on Far Field
• 2 Select Specific No of Points

Start
END
Num. of Field Points
U -27
V -21
N 76.2
U 21
V 21
N 76.2
U 21
V 21
n 1

• CREATE

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FAR FIELD
1 Right click on Far Field. 2 Select 3D pattern
from the appeared dialog box. 3 Click Create.
Select the Far Field and Near Field from the tree
and hide the 3D field pattern
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Obtaining a solution

• The model contains symmetry that can be used to
  decrease the required memory and solution time.
  Symmetry is a model wide setting and can be set
  on the Solve / Run tab under the Solution
  settings group.
• Two planes of symmetry are present. Magnetic
  symmetry can be applied in the yz plane (or the x
  0 plane), while electric symmetry can be
  applied to the xz plane (or they 0 plane)
• Click OK

• Once the model preparation is complete (i.e. the
  geometry, excitations, calculation requests and
  mesh are completed), the solution is obtained by
  running the FEKO solver.
• The solution is provided to save
  time. Before the model can be solved, it must be
  meshed. The solver is invoked by clicking on the
  FEKO solver button on the
• Solve / Run tab.

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POSTFEK Overview
POSTFEKO is used for validating
that the simulated model represents the intended
model and for the visualization of computed
results. POSTFEKO is launched from the Solve /
Run tab.

• Near field results (3D)

The near field calculation
which was requested earlier in this example has
been performed and stored. To display this data
in the 3D view, select the Home tab and click on
the Near field button. From the dropdown menu
select NearField1.

• Far field results
• Select the Home tab and click on the Far
  field button. From the dropdown list select
  FarField1. The annotation can be added by holding
  down ltCtrlgtltShiftgt and left clicking when the
  annotation is displayed in the desired location.

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• Fields are immediately displayed in the 3D view.
  In the Result palette set the Quantity to Gain.
  Check the dB checkbox to set the scale to dB.

The size of the far field compared
to the geometry size can be changed by selecting
the Result tab of the 3D View contextual tab.
Click on the Size button and select the Custom...
option from the dropdown list. Specify the size
as 70.
Create a polar graph, select the
Polar button (Home tab, Create new display
group). From the dropdown list, select FarField1.
In this case it is requested that the far field
gain be plotted in the YZ plane on a polar graph.
This corresponds to plotting the data with
respect to at a constant value of 90.
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• CONCLUSION

Designing of the Horn Antenna is done By using
CAD FEKO software in which the parameters of
waveguide and flare is designed. The mechanical
construction of Horn Antenna is constructed in
Mechanical Workshop.