LAB # 3amcresearch.weebly.com/.../9/7/6/6/97668312/antenna-lab3.pdf · 2018. 9. 5. · Fig (6): 3-D...
Transcript of LAB # 3amcresearch.weebly.com/.../9/7/6/6/97668312/antenna-lab3.pdf · 2018. 9. 5. · Fig (6): 3-D...
C ECOS University Department of Electrical Engineering
Waves Propagation and Antennas
LAB # 3
Dipole Antennas
& Parametric Analysis
Lab Instructor: Amjad Iqbal
Dipole Antennas
Note: Lab-2 is the pre-requisite of this Lab.
OBJECTIVE
This Lab is intended to show you how to Create, Simulate, and Analyze a Monopole and Dipole Antennas shown in Fig (1), using the Ansoft HFSS.
Fig (1): Dipole Antenna.
Dipole Antenna:
A Dipole antenna is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other (in line with each other), with a small space between them. The radio frequency voltage is applied to the antenna at the center, between the two conductors as shown in Fig: (1).
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Lab-3. Dipole Antennas & Parametric Analysis
Design at f = 800MHz
1. Create Geometry of Dipole Antenna
Set Units Select the units mm.
Set Material Select the material as Copper.
Draw a Cylinder with
Name: Pole1
Radius: 6mm Height: 75 mm
Draw a Cylinder with
Name: Pole2 Space between Cylinders should be 12 mm.
Radius: 6mm Height: -75 mm
To fit the view: • Select the menu item View > Fit All > Active View
2. Create Lumped Port Excitation
To set the Grid Plane: Select the menu item Modeler > Grid Plane > YZ
Draw a rectangle with Name: Lumped Port Fig (2): Lumped Port Excitation
Design Rectangle with available space of 12 mm between the two cylinders having
length of 12 mm and width of 6mm.
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3. Create Air
To set the default material: Using the 3D Modeler Materials toolbar, choose vacuum.
Draw a box with
Name: Air Box position Opposite Corner
X: -100 dX: 200 Y: -100 dY: 200 Z: -200 dZ: 400
Fig (3): Air
4. Create Radiation Boundary a) To create a face list.
Select the menu item Edit > Select > By Name.
Select Object Dialog,o Select the objects named: Air o Click the OK button.
Select the menu item HFSS > Boundaries > Assign > Radiation.
Radiation Boundary window
o Name: Rad1 o Click the OK button
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Lab-3. Dipole Antennas & Parametric Analysis
5. Create a Radiation Setup a) To define the radiation setup
Select the menu item HFSS > Radiation > Insert Far Field Setup > InfiniteSphere
Far Field Radiation Sphere Setup dialog.o Phi:
Start: 0 Stop: 360
Step Size: 2 o Theta:
Start: -180 Stop: 180 Step Size: 2
Click the OK button.
Analysis Setup
1. Creating an Analysis Setup a) To create an analysis setup:
Select the menu item HFSS > Analysis Setup > Add Solution Setup.
Solution Setup Window:
Solution Frequency: 800 MHz
Maximum Number of Passes: 20
Maximum Delta S per Pass: 0.002
Click the OK button.
2. Adding a Frequency Sweep a) To add a frequency sweep:
Select the menu item HFSS > Analysis Setup > Add Sweep.o Select Solution Setup: Setup1 o Click the OK button.
Edit Sweep Window:o Sweep Type: Fast. o Frequency Setup Type: Linear Count.
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Lab-3. Dipole Antennas & Parametric Analysis
Start: 600 MHz Stop: 1000 MHz
Count: 100
Save Fields: Checked. o Click the OK button.
Analyze
1. Model Validation a) To validate the model:
Select the menu item HFSS > Validation Check. Click the Close button.
Note: To view any errors or warning messages, use the Message Manager.
2. Analyze a) To start the solution process:
Select the menu item HFSS > Analyze.
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Lab-3. Dipole Antennas & Parametric Analysis
REPORTS
1. Create Modal S-Parameter Plot - Magnitude
Create report (Modal S-Parameter Plot - Magnitude) of the Model.
Fig (4): S-Parameter Plot
2. Create Far Field Radiation Pattern
Create report (Far Field Radiation Pattern & 3-D Polar Plot) of the Model.
Ansoft Corporation Radiation Pattern 2 HFSSDesign1
0
-30 30
-4.00
-18.00
-60 60
-32.00
-46.00
-90 90
-120 120
-150 150
-180
Curve Info dB(GainTotal)
Setup1 : LastAdaptive
Phi='0deg' dB(GainTotal)
Setup1 : LastAdaptive
Phi='90deg'
Fig (5): 2-D Radiation Pattern of Dipole Antenna.
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Lab-3. Dipole Antennas & Parametric Analysis
Fig (6): 3-D Polar Plot Dipole Antenna.
In-Lab Task:
Design a Dipole Antenna for f = 1800MHz and create Reports of the Model, also find out:
Lower & Higher Frequencies Bandwidth of Antenna Max. Gain of Antenna Return loss at f=1800MHz
Comparison of Radiation Patterns for f=800MHz & f=1800 MHz
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Lab-3. Dipole Antennas & Parametric Analysis