processing section 7: matrix post- training · (layout identical to hfss executive window view)...

smart software for high-frequency design7-1

Ansoft HFSS Version 7Training

Section 7: Matrix Post-Processing

shared by:www.cnantennas.com

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SynopsisInterfaces

� HFSS Executive Matrix View� Matrix Data Post-Processor� Matrix Plot Post-Processor

Matrix Data Manipulation� S-Parameter Format� Renormalizing� Deembedding� Exportation

Plotting Matrix Information� Plot Creation, Navigation and Editing� Saving and Opening Plots

Eigenmode Post-ProcessingInstructor-Led Exercises


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HFSS Executive Window Matrix View

� Available as longas at least onesolution is complete

� View S-parameters,Delta-S data,Impedance, andPropagationConstants inTabular Form

� Various DisplayFormats

� No datamanipulation orsave capability

Solution List Lists solutions available to viewA_n represents an Adaptive PassS_n represents a Sweep Solution

Display Options Select between (real, imag),(mag, phase), and (dBmag,phase) formats

Display Region

Frequency Selection Adaptive frequencies have onechoice only; sweeps permit view ofmatrix at each frequency point

View Options Lists All Parametersavailable for Viewing


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Matrix Data Post-Processor Interface

� Interface layoutidentical to HFSSExecutive WindowMatrix View

� Data import/export,computation(de-embed,renormalize, etc.)available via menupicks

� Saved data fromother projects canalso be accessedand viewed

(Layout identical to HFSS Executive Window View)

File Menu Contains Import andExport Options

Compute Menu (shown open) Contains Renormalize, De-embed,Y- and Z-Matrix Computation, andSweep Combination Picks

View Menu Contains Single/Multi-Mode ViewOptions, Command Prompt Access


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Matrix Plot Post-Processor Interface

� Allows plotting ofany availablesolution parameterfrom the MatrixData contents

� S-parameters,Impedance,Gamma, etc.

� Cartesian andPolar (Smith)formats

� Plots can benavigated, edited,and saved

� Plots from otherprojects may beopened

View Region Can contain multiple plots in tiledand cascaded orientation

Plot Menu Create, open, save,and edit plots

View Menu (shown open) Manipulate plot views, showspecific plot coordinates(rolling marker)


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Matrix Data Format� HFSS reports Generalized S-

Parameters� Normalized to impedance of

each port at each frequencypoint

� Implication: To output datafor use in a circuit analysistool, the data should first berenormalized to a singlecharacteristic impedance forall ports and frequencies

� S-Parameters are reported byport and mode

� Mode-to-mode interactionsbetween all ports included

� Reported format is[{terminating} port:mode,{originating} port:mode]

S[1:1,1:1] = “S11, same mode”(reflection coefficient)

S[3:2,3:1] = “S33, mode 1 to mode 2”(mode-converted reflection coefficient)

S[2:1,3:1] = “S23”(transmission coefficient from Port 2

to Port 3)

This Orthomode Coupler has three propagating modes at thecircular waveguide port and one at each rectangular port.Due to the numbering of the circular port modes, Mode 1 ofPort 3 transmits directly to the only mode (Mode 1) in Port 2,while Mode 2 in Port 3 transmits directly to the only mode(Mode 1) in Port 1. [The rightmost column of the abovematrix is not shown.]


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Matrix Data: De-embedding� De-embedding is the

process of shifting the S-matrix’s reference planeaway from the ports

� De-embedding can bedone into or out of themodeled geometry

� Caution: De-embeddinguses the complete(complex) propagationconstant solution found atthe port, therefore loss istaken into effect. However,de-embedding into a modelacross a discontinuity inthe transmission line cross-section is not valid!

The S-Matrix for this three-way power dividerare evaluated at the Ports. Deembedding canadd line length, assuming the transmission linecross-section at the port remains the same...

...subtracting length is also possible. However,specifying a distance which would deembed past achange in the transmission line cross-section willprovide invalid results!!


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Matrix Data: De-embedding Procedure� From the Compute Menu, pick

De-embed.... This opens thegraphical de-embedding window.

� Select a Port for de-embedding fromthe list

� Specify direction as into or out frommodel geometry

� Specify de-embedding length� Either select the Value button

and enter a numerical length, or� Select the Vector length button

and pick endpoints representingthe vector from the geometry

� Press the Set Distance button toconfirm the selected port’s settings

� Repeat for all ports to de-embed, thenpress the OK button

� De-embedded dataset shows inMatrix Data Solution List as “D_n”

1.

2.

3.

4.

7.

5.6.


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Matrix Data: Renormalization� Select the Solution set

for which you wish toobtain renormalizeddata

� Pick Renormalize fromthe Compute Menu

� Identify whichcharacteristicimpedance definitionshould be used for thecurrent matrixnormalization, anddefine the desiredRenormalizationimpedance

� Renormalized Solutiondata will be shown as“R_n” in Solution List

1.

2.

3.

4.

Zpv and Zvi will only beenabled as options for useas the current matrixnormalization if animpedance line wasdefined in the model.

NOTE: Re-normalization should ALWAYS be performed AFTER any required de-embedding.


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Matrix Data: Data Export� Data is exported directly from the

Matrix Data interface into severalpopular formats

� First select the desired Solutionset to export

� Select Export from the Filemenu, and define the desiredtype: Data Table is a format readableby MS Excel (.tab) Citifile is formatted like networkanalyzer output files Serenade is the Ansoft circuitsimulation suite Touchstone/Libra is an alternatesimulation suite Neutral Format is an Ansoftformat, exportable to other products

� The correct file extension shouldbe defaulted in the file savedialog which results

1.

2.

3.

NOTE: If you choose to export to a circuit simulatorformat (e.g. Touchstone), the interface will warn you ifrenormalization is recommended prior to Exportation.


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Matrix Plot: Creating New Plots� When first opened, Matrix Plot shows

a blank screen� To create a Plot, pick New Plot from

the Plot menu� Define the type of plot desired in the

resulting Define New Plot dialogwindow

Solution Sets Adaptive solutions can onlybe plotted in Smith format,while Swept solutions can beplotted in Cartesian or Smithformats.

Data Type Pick data toplot from list

Quantity Pick specific S- orImpedance parameters to plot

Component Pick componentto plot

Plot Formats Type (Cartesian, Smith), Domain(frequency, time), Scaling (dB,linear, or VSWR)


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Matrix Plot: Navigating a Plot� The Zoom tool icons

work the same as inall other modules

� Plot scale isauto-createdwith zoom in orout

� A data marker canbe placed using theShow Coordinatesmenu pick or toolicon, and can berolled along thetrace using thekeyboard cursorkeys.

� Mouse rightclick exits showcoord. mode


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Matrix Plot: Reformatting a Plot� Double-clicking

anywhere on the plotallows reformatting

� Horizontal andvertical axis

� Title or AxisHeaders

� Double-clickingon the plotLegend allowsreformatting ofthe trace lines(color, datasymbol, etc.)

� More traces can beoverlaid on the samechart using the Addto Plot pick from thePlot menu

(All other locations)


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Matrix Plot: Saving and Opening Plots� Save and Open options are

also in the Plot menu� Plots are saved in a *.dat

format by default� Plots from other projects

may be opened in thisinterface

� Data from currentproject can be ‘added’to other project dataplots in this manner

� For further Plot manipulationand comparison functions,including a signal calculator,see the PlotData utility offthe Utilities toolbar of themain Maxwell control panel


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Eigenmode Data Post-Processing� Eigenmode solutions do

not have matrix results� Matrix Data and Matrix

Plot Post-Processorsare disabled

� View Eigenmode resultsdirectly in HFSSExecutive Window

� Eigenmodefrequencies and Q (ifapplicable) aredisplayed in tabularformat

� Comparative Plot ofreal vs. imaginaryfrequency componentsis available for modelswith lossy conductorsand/or dielectrics


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Matrix Post-Processing Exercise

There is no formally-directed “Exercise” written for MatrixPlot and Matrix Data Operations

Your instructor will guide you through viewing somesolved project data to familiarize you with the use of theinterface

Look for projects named “*_slv” in your Project Manager


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processing section 7: matrix post- training · (layout identical to hfss executive window view)...

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