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Wp x y Bx By Lp Lf Wf Bt dx substrate x z dz air r =2.
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,. The return 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.
- Insert a New Design Project->Insert HFSS Design
- Save it as tutorial File->Save as
- Determine the approximate size of the patch. , ,
- Determine the line width of a 50 microstrip line. The width is about 4.5 mm ( ). Let the length be near quarter
wavelength ( )
- Determine the substrate size as where and . is the thickness.
- Determine the air box size where
- Enter the above variables. Project->Project Variables
- Enter the substrate Draw->Box Enter position as ( ). Give it a name “substrate”.
- Assign material property to the substrate by creating a new material by right click on the substrate.
- Create the patch surface and name it “Patch”. Draw->Rectangle Enter the position and size as in 8.
- Enter the feed line. Give it a name “feedline”. Draw->Rectangle The position is ( ), size is ( ).
- Define the ground plane. The position is ( ), size is ( ). Draw->Rectangle
- Define a surface for the lumped port at the end of the microstrip line. The position is ( ), size is ( ). Draw->Rectangle.
- Define the air box. Draw->Box
- Assign PMC boundary to the substrate.
- Assign PEC boundary to the patch, feedline and ground by right click on them.
- Assign Radiation Boundary to the air box.
-25.001.00 1.25 1.50 1.75 (^) Freq [GHz]2.00 2.25 2.50 2.75 3. -20. -15. -10. -5.
dB( S(^1 ,^1 )) S Parameter m Name m1 (^) 2.4150X (^) -24.1468Y Curve Info Setup1 : Fast^ dB(S(1,1)) -30. -20. -10.
90 60 30 0
150 120 Radiation Pattern 1 (^) Curve Info Setup1 : Single^ dB(GainPhi) Freq='2.42GHz' Phi='0deg' dB(GainPhi) Setup1 : Single Freq='2.42GHz' Phi='90deg' Setup1 : Single^ dB(GainTheta) Freq='2.42GHz' Phi='0deg' Setup1 : Single^ dB(GainTheta) Freq='2.42GHz' Phi='90deg'
-25.001.00 1.25 1.50 1.75 (^) Freq [GHz]2.00 2.25 2.50 2.75 3. -20. -15. -10. -5.
dB( S(^1 ,^1 )) S Parameter m m Name m1 (^) 2.4150X (^) -24.1468Y m2 2.4180 -20. Curve Info Setup1 : Fast^ dB(S(1,1)) $Lp='37mm' $Wp='74mm' dB(S(1,1)) Setup1 : Fast $Lp='36.6mm' $Wp='120mm' -30. -20. -10.
90 60 30 0
150 120 Curve Info Setup1 : Single^ dB(GainPhi) Freq='2.42GHz' Phi='0deg' Setup1 : Single^ dB(GainPhi) Freq='2.42GHz' Phi='90deg' dB(GainTheta) Setup1 : Single Freq='2.42GHz' Phi='0deg' Setup1 : Single^ dB(GainTheta) Freq='2.42GHz' Phi='90deg'
