This document provides an introduction to high frequency structure simulators. It discusses how these simulators use finite element methods to simulate complex 3D geometries. It requires significant memory and processing power. It describes the key features and applications of Agilent and Ansoft HFSS simulators, including computing S-parameters, modeling passive circuits, and displaying field solutions. It outlines the basic procedure to define a simulation, including drawing objects, assigning materials, applying boundaries, solving, and viewing results.
3. BACKGROUNDBACKGROUND
• Introduced from 90sIntroduced from 90s
• Simulation tool for complex 3 D geometriesSimulation tool for complex 3 D geometries
• Using Finite Element MethodUsing Finite Element Method
• Adaptive Mesh generation & refinementAdaptive Mesh generation & refinement
• 2 Main Vendors—Agilent & Ansoft2 Main Vendors—Agilent & Ansoft
• Merger from May 1Merger from May 1
• Transfer to Ansoft HFSS after Nov. 1, 2001Transfer to Ansoft HFSS after Nov. 1, 2001
4. REQUIREMENT & RESOURCESREQUIREMENT & RESOURCES
• HFSS consume tremendous memory if fine result is neededHFSS consume tremendous memory if fine result is needed
• 300M+ Memory and 400M+ processor is recommended300M+ Memory and 400M+ processor is recommended
• Floating License Key within ECEWIN2K subnetFloating License Key within ECEWIN2K subnet
• Remote access to new Scully which has 1 G RAMBUS400 Memory and 1.7G P4Remote access to new Scully which has 1 G RAMBUS400 Memory and 1.7G P4
processorprocessor
7. FEATURES(1)FEATURES(1)
• Computes s-parameters and full-wave fields for arbitrarily-shaped 3D passiveComputes s-parameters and full-wave fields for arbitrarily-shaped 3D passive
structuresstructures
• Powerful drawing capabilities to simplify design entryPowerful drawing capabilities to simplify design entry
• Field solving engine with accuracy-driven adaptive solutionsField solving engine with accuracy-driven adaptive solutions
• Powerful post-processor for unprecedented insight into electrical performancePowerful post-processor for unprecedented insight into electrical performance
8. FEATURES(2)FEATURES(2)
• Advanced materialsAdvanced materials
• Model Library-including spiral inductorsModel Library-including spiral inductors
• Model half, quarter, or octet symmetryModel half, quarter, or octet symmetry
• Calculate far-field patternsCalculate far-field patterns
• Wideband fast frequency sweepWideband fast frequency sweep
• Create parameterized cross section models- 2D modelsCreate parameterized cross section models- 2D models
10. PROCEDURE TO SIMULATEPROCEDURE TO SIMULATE
1.1. Open or Make new projectOpen or Make new project
2.2. Draw objectsDraw objects
3.3. Assign material propertyAssign material property
4.4. Define boundary conditionsDefine boundary conditions
5.5. SolveSolve
6.6. Display resultDisplay result
30. RESULT COMPARISONRESULT COMPARISON
• r=8.5; Hsub=625 um; W=150um; G=75 umr=8.5; Hsub=625 um; W=150um; G=75 um
@10G Theoretical HFSS
L=100 um 0.04 nH 0.05 nH
L=300 um 0.12 nH 0.13 nH
L=600 um 0.24 nH 0.24 nH
L=800 um 0.33 nH 0.31 nH
0
0
0
L
L
Z jZ Tan L
Z Z
Z jZ Tan L
β
β
+
=
+
---Theoretical Equation
32. IMPEDANCE CONCEPTIMPEDANCE CONCEPT
• Zpi, Zpv & ZviZpi, Zpv & Zvi
• Microstrips use Zpi impedanceMicrostrips use Zpi impedance
• Slot-type (CPW) use Zpv impedanceSlot-type (CPW) use Zpv impedance
• TEM waves use Zvi impedanceTEM waves use Zvi impedance
*
2 1
; ;
2
P
Zpi P ExHds I Hdl
I I
= = =
× ∫ ∫Ñ Ñ
*
2
V V
Zpv
P
×
=
Zvi Zpi Zpv= ×
33. PROJECTS WITH HFSSPROJECTS WITH HFSS
• Microstrip Line to Waveguide TransitionMicrostrip Line to Waveguide Transition
34. EM FIELD OF THE TRANSITIONEM FIELD OF THE TRANSITION
40. USEFUL LINKSUSEFUL LINKS
• http://www.ansoft.comhttp://www.ansoft.com
• http://dutettq.et.tudelft.nl/~hfss/welcome.htmlhttp://dutettq.et.tudelft.nl/~hfss/welcome.html
• http://wwwinfo.cern.ch/ce/ae/Maxwell/index.htmlhttp://wwwinfo.cern.ch/ce/ae/Maxwell/index.html
• Documents for HP HFSS is in “Scully”Documents for HP HFSS is in “Scully”
c:/Otherprg/hfss/docc:/Otherprg/hfss/doc