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IBM Release 1.93 manual

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Figure 2.14 Optimized V antenna: power dissipation density. Note the very large maximum at the feed point.

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Contents

January 22 Updated January 23 Phil Hobbs A Programmable Optimizing Electro-Magnetic Simulator ReleaseIBM T. J. Watson Research Center Yorktown Heights, NY ?88,.d88b, d8888b d8888bPage A Programmable Optimizing Electro-Magnetic Simulator Release August 21 Phil HobbsIBM T. J. Watson Research Center Yorktown Heights, NY POEMSChapter Appendix A. V-Antenna Optimization RunChapter Introduction 1.1. Motivation1.1.1. Philosophy 1.1.2. Structure 1.1.3. OptimizationPage Optimization Loop Front-End Script POEMS.CMDFDTD Engine FIDO + CLUSTER SCRIPT or TEMPEST Postprocessor2. HOW POEMS WORKS 2.1. Program Organization2.2. The Front-End Script poems.cmd 2.2.1. Script Operation2.3. The FDTD Engine FIDO/TEMPEST 2.4. The Postprocessor EMPOSTempost ordersfile resultsfile 2.5. The Visualization System VIS5D2.6. Cluster Control 2.6.1. Parallel Processing 3. USING POEMS 3.1. Command Reference3.1.1. poems Command-Line Options 3.1.2. GLOBAL GroupFREQ 200*THz NB Hosts are identified by their hostname as specified by the $HOSTNAME environment variable, rather than by IP address. Thisaliases in different SUBDOMAIN statements in the parameters file which means that the host’s predefined hostname is not usedMACRO Syntax PRINT string expression 3.1.3. WORLD Group 3.1.4. MATERIAL Group Syntax XRANGE minexpression maxexpressionDEFINE matname=copper type=conductor conductivity=5.8e7 Parameters epsReal epsImag muReal muImagDEFINE matname= BlackGlass type=dielectric n=1.52 k=1e-3 3.1.5. OBJECT Group xhi1,yhi1,zhi1 and xlo2,ylo2,zlo2, xhi2,yhi2,zhi2. These must bephasefunc interval xhi2 ylo2 yhi2 zlo2 zhi2Parameters matname orientation xlo xhi ylo yhi zlo zhi widthfunc Parameters mattype xlo xhi ylo yhi zlo zhi thicknessParameters mattype xlo xhi ylo yhi zlo zhi Parameters mattype slo shi perp hfunc vfuncNot implemented in this release Parameters mattype axis lo hi maxradius insidefuncParameters x y z width kx ky kz Ex Ey Ez mag phase n k orientation Parameters x y z kx ky kz Ex Ey Ez mag phase orientation3.1.6. SOURCE Group ParametersNot implemented in this release3.1.7. COMMAND Group Parameters x y z Ex Ey Ez mag phase3.1.8. OUTPUT Group Parameters reltolerance maxcycles mincycles timestepParameters variable xlo xhi ylo yhi zlo zhi x y z file phase state3.1.9. POSTPROCESS Group supplied plane, xmin ≤ x ≤ xmax, ymin ≤ y≤ ymax, zmin ≤ z ≤ zmax Parameters name xlo xhi ylo yhi zlo zhi file directiontowards from xInside, yInside, zInside Parameters name xinside yinside zinside xlo xhi ylo yhi zlo zhiParameters file orientation xlo xhi ylo yhi zlo zhi phase indexn The value of coordinates can be polar or rectangular, and arrangementParametersfile orientation xlo xhi ylo yhi zlo zhi dt frames variable Parameters frames variable1 variable2 variable3 variable4 variable5variable6 variable7 variable8 variable9 xlo xhi ylo yhi zlo zhi file MOVIEParameters name xlo xhi ylo yhi zlo zhi file xinside yinside zinside levelDISSIPATION level3.1.10. OPTIMIZE Group arbitrary boundary. Not implemented in this release not be updated at postprocessing time. That means that theSyntax GUESS var1 = expression var2 =, expression 3.1.11. SCHEDULE Group PENALTY expressionParameters iterations tolerance restarts Stepping is not implemented in this release3.2. The Computational Domain 3.2.1. SymmetryUnfolded 2N-2 Rows Actual Domain N rows Image Domain N-2 Rows Next Period3.3. OBJECTS 3.3.1. Perfectly-Matched Layers 3.4. MATERIALS3.5. SOURCES 3.5.1. POINT SOURCES3.5.2. PLANE WAVES Page 3.5.3. BEAM SOURCES 3.5.4. MODEFILE SOURCES3.6. Optimization 3.6.1. Merit Functionsc. Phase uniformity across a plane e. Power dissipation in a load dissipationd. RMS Voltage across terminal points f. Reflection from an interface3.6.2. Worked Example Optimizing a V Antenna F i g u r e 2 . 1 2 Optimized V-antennaPage 3.7. Predefined Constants 3.6.3. Worked Example Doped Silica Waveguide Mode3.6.4. Worked Example Glass Ridge Waveguide to Free Space Coupler 3.7.1. Reserved Names i l l u m i n a t i o n p l a n e a f t e ra. Differences from C/C++ 3.8. Predefined Mathematical Functions3.8.1. Arithmetic Operators 3.8.2. Logical Operators 3.8.3. ABS3.8.4. ACOS 3.8.5. ACOSH3.8.10. ATAN2 3.8.11. CEIL3.8.12. COS 3.8.13. ELINTK3.8.19. INTEGRAL 3.8.20. LN3.8.21. MAX 3.8.22. MIN3.8.26. RANDOM 3.8.27. ROOT1D3.8.28. ROUND 3.8.29. SIGN3.9. Analytical Pupil Functions 3.10. Material Parameter Functions2. Time step A. TEMPEST and General FDTD Information1. Startup and Steady State printftime step after adjustment %e\n,dtfflushstdout periodstep+=2 i=periodstep%4 if i!=0 periodstep=periodstep+4-idt=2.0*PI/omega*FLOATperiodstep fprintfstderr,periodstep %d\n,periodstepAppendix A. V-Antenna Optimization Run The run will produce lots of bitmaps at appropriately chosen locationsA.1. POEMS INPUT DIPOLE2I.PAR Fundamental dimensions set phi=0 /* phase of excitation */ set ky0=step/lambdaset dipoleheight=0.2*um set dipolethickness=0.30*um set kx0=0 /* direction of plane wave set loadlength=2*stepDEFINE matname= Load type=dielectric n=nloadk=kload END WORLD SUBDOMAIN ALL XRANGE 0 xsize YRANGE 0 ysize ZRANGE 0 zsizeEND COMMAND COMPUTE maxcycles = 25 reltolerance = END OUTPUT zhi=zsize phase=0 state=steady file=Dipole2Iexizlo2 = Zvertex-DipoleThickness/2 zhi2= Zvertex+DipoleThickness/2 FAN matname=PCL taper=linear taperpar=0END OPTIMIZE STORE Dipole2I.simplex MERIT diss*1e12PHASEEX xlo=0 xhi=xsize ylo=0 yhi=ysize zlo=0 zhi=zsize file=Dipole2IPhaseExPOSTPROCESS AMPLEXzlo=zsize/2+step zhi=zsize/2+step, file=Dipole2IIndexXY.bmp phase=0 file=Dipole2IPZXY.bmp phase=0 palette=redbluezhi = zsize-Tpml-step xinside=xsize/2 yinside=ysize/2 zinside=zsize/2 FLUX name=MiddleFlux , /* crossing the middle z=zsize/2 xLo = Tpmlfile=Dipole2IPZZX.bmp phase=0 palette=redblue file=Dipole2IPXXY.bmp phase=0 palette=redbluefile=Dipole2IPXZX.bmp phase=0 palette=redblue file=Dipole2IAmpExZX.bmp phase=0 palette=flameSLICE orientation=xy variable=PhaseEx , xlo=0 xhi=xsize SLICE orientation=zx variable=PhaseEx , xlo=0 xhi=xsizefile=Dipole2IExIZX.bmp phase=0 palette=redblue file=Dipole2IDissXY.bmp palette=redbluefile=Dipole2IExQZX.bmp phase=pi/2 palette=redblue END ylo=ysize/2 yhi=ysize/2, zlo=0 zhi=zsizeA.2. tempest Input File DIPOLE2I.PAR.IN rectangle node0 100 index 1.000000 plot hy steady 0.250000 node 0 99 0 99 0 99 dipole2ihyqWritten by 56 pages of pointsource statements omitted A.3. Postprocessor orders DIPOLE2I.ORDERS empost dipole2i.orders outfile v5dfileDIPOLE2IEYI NULLEXI ARRAY Domain for comparison e.g. modematch 0.00000 SLICE POSTPROC.16.COMPARISONDOMAIN 0.00000 SLICE A.4. Run Results DIPOLE2I.SIMPLEX Contracting by 0.5 in 1D 1-D shrink unsuccessful 0.00000064767135 98.83191 0.000001519205 Penalty =0.00000069266248611 90.849532778 0.00000152214633334 Penalty = 0.000000883423566665 77.7563866665 0.0000017351705 Penalty =Reflecting through centroid. Contracting by 0.5 in 1D Reflecting through centroid. Contracting by 0.5 in 1DReflecting through centroid. Contracting by 0.5 in 1D Reflecting through centroid. Contracting by 0.5 in 1DReflecting through centroid. Contracting by 0.5 in 1D Reflecting through centroid. Contracting by 0.5 in 1DReflecting through centroid. Contracting by 0.5 in 1D Failed to converge in 36 function evaluationsReflecting through centroid. Contracting by 0.5 in 1D Reflecting through centroid. Contracting by 0.5 in 1D1-D shrink unsuccessful 0.000000572297880735 102.392565535 0.00000148853488604 Penalty =Converged in 56 function evaluations Reflecting through centroid. Contracting by 0.5 in 1DReflecting through centroid. Contracting by 0.5 in 1D B.1.1. tempest patches Appendix B. ConfigurationB.1. FDTD and TEMPEST B.1.3. Advice common to all or most FDTD programs B.1.2. tempest limitationsb. Understanding convergence c. Hints and KinksB.2. REXX B.3. X Window System ConfigurationB.3.1. Sample X11 Configuration B.4.1. Wish list B.3.2. Running Vis5DB.4. Release Notes B.4.2. Beta Release Limitations ZX plane Y perpendicular +Z right, +X up, +Y out of screen XY plane Z perpendicular +X right, +Y up, +Z out of screenYZ plane X perpendicular +Y right, +Z up, +X out of screen Appendix C. Multiprocessing INDEX Airy pattern Antenna 1, 39, 40, 45, 51, 52BASICSTEP 16, 18, 24, 54, 62 Boundary 7, 15, 19, 29, 31 C++ 7Periodic boundary conditions 31, 34