HFSS tutorial1

7/25/2019 HFSS tutorial1

1/6

Wp

x

y

Bx

By Lp

Lf

Wf

B t

dx

substra te x

z

dz

air

r=2.54

HFSS Tutorial 1: Edge-fed Patch Antenna

Goal: design a microstripline edge-fed patch antenna operating at

2.425 GHz using a substrate with thickness 1.6 mm, . Thereturn loss must be less than 20 dB at 2.42 GHz.

Lessons learned:

Basic geometry entry.

Frequency sweep setup.

Parameter sweep setup.

Boundary setup.

Lump port setup.

1. Insert a New Design

Project->Insert HFSS Design

2. Save it as tutorial1

File->Save as3. Determine the approximate size of the patch.

, ,

4. Determine the line width of a 50 microstrip line.

The width is about 4.5 mm ( ) . Let the length be near quarter

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wavelength ( )

5. Determine the substrate size as where and

. is the thickness.

6. Determine the air box size where

7. Enter the above variables.

Project->Project Variables

8. Enter the substrate

Draw->Box

Enter position as ( ). Give it a name

substrate.

9. Assign material property to the substrate by creating a new

material by right click on the substrate.

10. Create the patch surface and name it Patch.

Draw->Rectangle

Enter the position and size as in 8.

11. Enter the feed line. Give it a name feedline.Draw->Rectangle

The position is ( ), size is ( ).

12. Define the ground plane. The position is ( ), size

is ( ).

Draw->Rectangle

13. Define a surface for the lumped port at the end of the microstrip

line. The position is ( ), size is ( ).Draw->Rectangle.

14. Define the air box.

Draw->Box

15. Assign PMC boundary to the substrate.

16. Assign PEC boundary to the patch, feedline and ground by right

click on them.

17. Assign Radiation Boundary to the air box.

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18. Assign Lump Port to the port surface similarly.

19. Perform a simulation from 1 GHz to 3 GHz.

Analysis->Add Solution Setup

Set solution frequency to 3 GHz. Set Maximum Number ofPasses to 99.

20. Add Fast Sweep from 1 GHz to 3 GHz. Step size 0.01.

Setup1->Add Frequency Sweep

21. Perform simulation

Sweep->Analyze

22. Check simulation results. Check convergence.

Results->Solution Data

23. Plot and Smith Chart.Results->Create Modal Solution Date Report.

24. Add Parametric Sweep for .

Optimetrics->Add->Parametric

25. Add Parametric Sweep for .

Optimetrics->Add->Parametric

26. Repeat 24 and 25 until satisfactory results are achieved.

27. The first solution is . However, from thecurrent distribution and radiation pattern, the excited mode is x-

directed, not y-directed.

28. Keep increase and steps 24 and 25.

29. Final result: .

Note about default boundary setting:

Metal: finite conductivity. Dielectric: none.

Outmost surface: PEC.

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1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00Freq [GHz]

-25.00

-20.00

-15.00

-10.00

-5.00

0.00

dB(S(1,1

))

S Parameter

m1

Name X Y

m1 2.4150 -24.1468 CurveInfodB(S(1,1))

Setup1 : Fast

-30.00

-20.00

-10.00

0.00

10.00

90

60

30

0

-30

-60

-90

-120

-150

-180

150

120

Radiation Pattern 1Curve Info

dB(GainPhi)Setup1 : SingleFreq='2.42GHz' Phi='0deg'

dB(GainPhi)

Setup1 : SingleFreq='2.42GHz' Phi='90deg'

dB(GainTheta)Setup1 : SingleFreq='2.42GHz' Phi='0deg'


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1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00Freq [GHz]

-25.00

-20.00

-15.00

-10.00

-5.00

0.00

dB(S(1,1

))

S Parameter

m1

m2

Name X Y

m1 2.4150 -24.1468

m2 2.4180 -20.2851

CurveInfo

dB(S(1,1))

Setup1 : Fast$Lp='37mm' $Wp='74mm'

dB(S(1,1))Setup1 : Fast$Lp='36.6mm' $Wp='120mm'

-30.00

-20.00

-10.00

0.00

10.00

90

60

30

0

-30

-60

-90

-120

-150

-180

150

120

Curve Info





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1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00Freq [GHz]

-22.50

-20.00

-17.50

-15.00

-12.50

-10.00

-7.50

-5.00

-2.50

0.00

dB(S(1,1

))

S Parameter

Wp=120mm

Wp=110mm

Wp=100mm

Wp=90mm

p=80mm

Curve Info






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HFSS tutorial1

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