Introducing HFSS Version 12

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© 2008 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary

In t roduc ing HFSS Vers ion 12

Mat t hew H. Comm ens,Ph.D.Produc t Manager

Ansof t HFSS




…achieve a dramatic reduction in developmenttime and costs while at the same time realizing

increased reliability and…

…high-performance computing enhancement,domain decomposition…simulate and design at a

scale and speed never before possible.

…ANSYS follows through on its commitment todeliver technology with unequalled depth and

unparalleled breadth…

“HFSS 12.0 is a breakthrough in high-frequency electromagnetic fieldsimulation,” said Zol Cendes, chief technology officer at Ansoft. “For the

first time, engineers are able to solve vast electromagnetic field

problems with speed, efficiency and accuracy. “

HFSS 12.0




HFSS 12: New Feat ures

New Solver Technology

New Meshing

Technology

New ElementTechnologies

Adjoint Method Based Derivatives

Integration with ANSYSDesignXplorer

Improved GUI and Modeler




New So lver Tec hnology Dom ain Dec om pos it ion




Sim ulat ing Large

•F-35 Joint Strike Fighter: UHF blade antenna @ 350 MHz

•L = 18.6λ, V = 806λ3




“ Div ide and Conquer”




Dom ain Dec om pos it ion

• Distributed memory parallelsolver technique

• Distributes mesh sub-

domains to network of processors

• Significantly increasessimulation capacity

• Highly scalable to largenumbers of processors

• Automatic generation of domains by mesh partitioning– User friendly

– Load balance

• Hybrid iterative & direct solver – Multi-frontal direct solver for

each sub-domain

– Sub-domains exchangeinformation iteratively viaRobin’s transmissionconditions (RTC)

Distributes mesh sub-domains

to networked processors and memory




18X Speed-up w i t h 15 Dom ains

Number ofdomains Time (sec) Speed-up

1 23252 1.00

2 8928 2.60

3 6056 3.84

4 4479 5.19

5 3476 6.69

6 2784 8.35

7 2649 8.78

8 2180 10.67

9 2032 11.44

10 1760 13.21

11 1859 12.51

12 1804 12.89

13 1527 15.23

14 1649 14.10

15 1313 17.710

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Time (secs)

Time (secs)

1

2

3

4

5

6

7

8

9

10

1112

13

14

15

16

17

18

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Speed-up

Speed-up

Superlinear performance!




• Consistent results between domaindecomposition and direct solver

Resul t s and Acc uracy




Hum vee w i t h Pat c h Ant ennas

• Two L-band patch antennas

located on roof of Humvee

– Fed using TM20 mode to excitemonopole far-field pattern

• Bounding airbox is 12.5λ x 22λ x

8λ

or 2200λ3

6 domains Domain Solver

Total Memory 4.5 GB

Average Memory 0.75 GB

Solution Time 25 min

1st order basis functions. Performed

8 passes to reach ΔS = 0.02




WLAN Ac c ess Point and Pr in t er

• Wireless printer and router in typical office

environment

– 2.44 GHz solution frequency

• Room size is 25λ x 25λ x 22λ or 13750λ3

• Solved on 16 core AMD Opteron

workstation

• Printer-to-router coupling: -57 dB

15 domains Domain Solver

Tetrahedra 846k

Total Memory 32 GB

Average Memory 2.0 GB

Solution Time 5 hr 20 min




Met al l ic Sphere

• Mie scattering from a PEC Sphere

– 100λ in diameter

– Distributed to 30 cores across four

networked computers

• Re-calibrate your Expectation!

9M tetrahedra, 64-bit

meshing

51M unknowns (matrix size)




Dom ain Dec om pos it ion Ex am ple Ant enna In t egra t ion on Spac ec ra f t




Ant enna Elem ent Des ign

• Operating criteria

– 3-4 GHz frequency band

– 50 Ω input impedance

• Axial mode helix selected as antenna

– Endfire radiation with moderate gain

– Right-hand circular polarization

– Wide bandwidth

– Simple feed

– High radiation efficiency

• Orthogonal support dielectric along helix

• Coax probe feed extends above antenna

ground plane

• Simulation with direct solver

– 200k unknowns in 1.2 GB




Fini t e Array Model

• 7-element array model with

finite ground plane

– Includes edge effects– Includes mutual coupling

between elements

Fields with All Element Excited

Far-field Pattern for

Broadside Beam

Far-field Pattern for

Broadside Beam




Ins t a l led Array on Spac ec raf t

• Good correlation with

isolated array patterns

• L = 78λ, V = 31,000

λ3

– 25M unknowns

– 12 hr runtime, 35 cores

• Recalibrate your expectations!




New Meshing Tec hnology




New Meshing Tec hnology

model

Geometric healing or repair

(For model defects)

Surface mesh generation

Volume mesh generation

HFSS 11

(bottom up algorithm)

Surface Mesh

Volume Mesh

model

Volume mesh generation

Adapt mesh to conform to geometry

Conformal surface mesh generation

HFSS 12

(top down algorithm)

Surface Mesh

Volume Mesh




TAU Mesher

• Mesh a higher percentage

• Effective on imported geometries

• Higher mesh quality

• fewer total elements• smoother element transition

• Automatically healing and repair.

v11

v12




Molex Back p lane Connec t or

•11.0 Initial Mesh: 631862

•12.0 initial Mesh: 227517, ~63% reduction in initial mesh size

•Mesh reduction directly translates to reduction in memory and solution time

Fewer, higher quality mesh elements




New Elem ent Tec hno logy Curv i l inear Elem ent s




Curv i l inear Elem ent s

• Most accurate solution to fields on

curved structures

• Mesh adapted about curved or

true surfaces

• Element matrices computed using

the curved boundaries

• Reduces solution time and RAM

usage

– A smaller, coarser mesh

achieves equivalent accuracy

Rectilinear mesh element Curvilinear mesh element

Red – HFSS

Blue – Analytic Curve10 cm radius PEC sphere

solved from 0.040 - 2 GHz




SLAC Beam Form er

11426.0 11426.5 11427.0 11427.5 11428.0 11428.5 11429.0 11429.5 11430.0Freq [MHz ]

-40

-35

-30

-25

-20

-15

-10

-5

0

R e t u r n L o s s T M 0 1 m o d e ( d B )

Ans oft LLC tru es urface s_ lon ger XY Plot 4Curve Info

dB(S(WavePort1:3,WavePort1:3))Setup1 : Sw eep1SA='22.5deg'

Measurements

11,428.4 +- 0.5 MHz

E-field along Z




Resonat or w i t h Conc ent r ic

Spheric a l Die lec t r ic s

I Wolff, “A generalized description of the spherical

three-layer resonator with an anisotropic dielectric

material,” IEEE AP Symp, June 1987, pp. 307-

310

Faceting f (GHz)

45˚ 8.75

30˚ 8.54

15˚ 8.53

10˚ 8.40

7.5˚ 8.40

5˚ 8.39

22.5˚ 8.38

ΔF=0.1% Mesh Time

10˚ rect. 53k 16:40

22.5°curv.

6k 00:55

• Fewer curvilinear elements yield

same accuracy as rectilinear

– 88% fewer tetrahedra

– Runs 16X faster




New Elem ent Tec hno logy Mix ed Elem ent Orders




Mix ed Elem ent Orders

• Automatic localization of basisfunctions

• Refinement via element size andorder

• Locally efficient use of computingresources

First-Order, 16:23, 1.40GB

Mixed-Order, 7:55, 0.985GB




Log Per iodic over EBG

Groundplane • High geometric detail with large

homogeneous radiation volume

• Compare mixed order vs. 1st

order– 28% reduction in solution time

– 29% reduction in memory

• Mixed order converges faster– 12 passes vs. 14 passes

– Average order = 0.96

• S11 @ 12 GHz– 1st S11 = 0.86584

– Mixed S11 = 0.86511




Int roduc ing Ad jo int Met hod Based Der iv ia t ives




Adjo int Der ivat ives

• New Capability for sensitivity, tuning, and optimization

• Compute the derivatives of SYZ parameters with respect to project and

design variables

• Eliminates need to solve multiple variations with small differences andnumerical noise

– More efficient and more accurate

• Provides real-time tuning of reports to explore effects of small design changes

• Improves derivative-based optimization methods

2008 IEEE MTT-S Digest, pp. 527-530




Sensi t iv i t y of |S11|, Com bl ine Fi l t er

-15000

-10000

-5000

0

5000

10000

9

9 . 1 5 9 .

3 9 . 4 5 9 .

6 9 . 7 5 9 .

9

1 0 . 0 1 0

.

1 0 . 3 1 0

. 5

1 0 . 6 1 0

. 8

1 0 . 9

freq [GHz]

d S 1 1

d

1 / m

-60

-50

-40

-30

-20

-10

0

| S 1 1 |

d B

d|S11|_dRi

d|S11|_dG1

d|S11|_dG2

|S11|

This filter design is:

- Most sensitive to change in gap G2

- Least sensitive to change in coax radius Ri

G2G1

G2

Ri

Ri

G1 – gap between centertuner and resonator

G2 – gap between off-centertuners and resonators

Ri – inner radius of coax feed

Note: for sensitivity with respectto Ri, ports are involved




Loc al Der iva t ives Speed-up Opt imizat ion

• Goal: Minimize reflection in

waveguide quarter wave

transformer

• SNLP optimizer uses derivativeinformation to speed-up

calculation of response surface

Example Optimization without Derivatives

Example Optimization with Derivatives




SMA launc h

• SMA launch is typical multi-variable design problem

• Design variables:

– length, radius of via stub, radius of antipads, radius

of signal pads, radius & antipad of ground via

• Solve for the derivatives of many variables at onceNominal Values for

Design Variables

Specify Desired Derivatives

in Solution Setup




Real -T im e Tuning w i t h Analyt ic a l

Der ivat ives • Real-time tuning shows effects of

small changes on S-parameters

S-parameters of Nominal Design

S21

S11

Quickly Explore Effects of Small

Changes on S-parameters

New DerivativeContext in

Report Editor




Im proved GUI and Modeler




Post -Proc essing Var iables

• New type of variable whose valuecan be modified without re-simulating model

• Optimize complex weights of

antenna elements in phased array

– Optimize for side-lobe locationand main beam peak

Optimization of Phased Array Excitations

Synthesized Far-field Pattern




Convergenc e Based on Mul t ip le

Out put Var iab les • Evaluate and save multiple

expressions vs. adaptive pass– Includes SYZ parameters,

local, near and far field– Fully integrated with reporter

and Optimetrics




Cl ip Plane View ing

• Project preview

– Image and notes

available in File Open

– Image available in

Windows Explorer

• Clip plane– Interactively slice

through arbitrary plane

– Can view model

geometry, mesh plots,field plots, etc.




Selec t by Area Mode

• Enable material override– Conductors override

dielectrics

– Smaller objects overridelarger objects with samematerial

– Avoids need for explicitsubtractions

• Select objects by area– Click and drag to rubber-band

select

– Right-to-left selects all objectspassing through window

– Left-to-right selects all objectsinside window




Overlay Far Field Plot s on Model

• Visualize radiation patterns on model geometry

– Control transparency and/or size of pattern overlay




Array Var iables

Supported at

design level only

Assign array

variable toMaterial property




New Mode l ing Com m m ands

• Fillets andChamfers on2D objects

• Sheet wrapping

• Sheet and bodyimprinting with

projection

“Modeler/Chamfer (Fillet)”




Streamline plot of Poynting vector

on this face. Streamlines originate at

discrete points on the face

St ream l ine p lo t s




In t egra t ion w i t h ANSYS DesignXplorer

ANSYS DesignXplore r in R12 1




ANSYS DesignXplore r in R12.1and HFSS 12.0

WR137

WR90 Transition

l e n g t h

h e i g h

t

w i d t h




DX – Response Sur fac e




DX – Robust Design (DOE)




Six Sigm a

Port post-processing on fields

Matched terminal s parameters




Matched terminal s-parameters

Modeler selection by area filter

Fixed distance padding for region

User Defined Keyboard shortcuts

Expression cache

Multiple output variable convergence

Overlap/intersecting object selection from messagewindow

ACIS R19 SP2 upgrade

Extended healing capability

Improved setup for analytic ports

Project specific script recording

Define parametric sweep from file

Improved far field data link. More efficient

Project Preview – Both file open and in Windows Explorer

Flexible history editing

Polyline cross-section

Mode filtering for report setup

HFSS 12.0: Avai l able Now !

Introducing HFSS Version 12

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