Introduction to High Frequency Structure Simulator Pengcheng Jia

Background        Introduced from 90s Simulation tool for complex 3 D geometries Using Finite Element Method Adaptive Mesh generation & refinement 2 Main Vendors—Agilent & Ansoft Merger from May 1 Transfer to Ansoft HFSS after Nov. 1, 2001

Requirement & Resources     HFSS consume tremendous memory if fine result is needed 300M+ Memory and 400M+ processor is recommended Floating License Key within ECEWIN2K subnet Remote access to new Scully which has 1 G RAMBUS400 Memory and 1.7G P4 processor

Agilent HFSS

Ansoft HFSS

Features(1)     Computes s-parameters and full-wave fields for arbitrarily-shaped 3D passive structures Powerful drawing capabilities to simplify design entry Field solving engine with accuracy-driven adaptive solutions Powerful post-processor for unprecedented insight into electrical performance

Features(2)       Advanced materials Model Library-including spiral inductors Model half, quarter, or octet symmetry Calculate far-field patterns Wideband fast frequency sweep Create parameterized cross section models 2D models

Applications       Antennas Microwave transitions Waveguide components RF filters Three-dimensional discontinuities Passive circuit elements

Procedure to simulate 1.

2.

3.

4.

5.

6.

Open or Make new project Draw objects Assign material property Define boundary conditions Solve Display result

New project

Project Preferences

Drawing basics

Drawing Lines & 2 D objects

Drawing 3 D objects

Object Library

Editing Objects

Materials

Metal & Resistor

Boundaries

Boundary Conditions

Add A Boundary

Display Boundary

Calibrating Ports

Solve

Frequency & Meshing

Displaying Results

S Matrix

Plot Field

Result Comparison   r=8.5; Hsub=625 um; W=150um; G=75 um

Z



Z

0

Z L Z

0   0

L

  ---Theoretical Equation @10G Theoretical HFSS L=100 um 0.04 nH L=300 um 0.12 nH 0.05 nH 0.13 nH L=600 um 0.24 nH L=800 um 0.33 nH 0.24 nH 0.31 nH

Finite Element Method Tetrahedron

Impedance Concept     Zpi, Zpv & Zvi Microstrips use Zpi impedance

Zpi

 2

P

* ;

P

 1 2   

Hdl

Slot-type (CPW) use Zpv impedance *

Zpv

 2

P

TEM waves use Zvi impedance

Zvi



Projects with HFSS  Microstrip Line to Waveguide Transition

EM Field of the transition

Waveguide Combiner System

Slotline Antenna

Bonding Wire Discontinuity

Packaging for CPW Lines

Field Plot

Useful links    http://www.ansoft.com

http://dutettq.et.tudelft.nl/~hfss/welcome.html

http://wwwinfo.cern.ch/ce/ae/Maxwell/index.html

 Documents for HP HFSS is in “Scully” c:/Otherprg/hfss/doc

References   HP High-Frequency Structure Simulator User’s Reference HP High-Frequency Structure Simulator Tutorial