A
softHFSSAdva
cedTrai
i
gExerciseA
te
aPostProcessi
g
Thisexerciseassumesthatyoualreadyhavesomeexperie
cewithA
softHFSSTherefore
oteverybutto
clickwillbedescribedi
detail
1
I
troductio

I
thisexercisewewillco
ce
trateo
a
te
apostprocessi
gSpecificallywewillhavealookataxialratioa
dpolarizatio
ratioa
dgetfamiliarwiththecalculatorTheverysimplemodelwearegoi
gtobuildhastwoimporta
tadva
tagesFirstduetoitssimplicitywewillspe
dlittletimedrawi
ga
dsetti
gupthemodelFurthero
ceit’ssolvedwewillbeabletocreatea
yli
earlycircularlya
dellipticallypolarizedwavebyplayi
gwiththeamplitudesa
dphasesofthetwomodesi
theporta
dwewillhaveagoodfeeli
gfortheki
dofresultsweca
expect
Fig1
Squarewaveguideradiati
gi
toair
Themodelwearegoi
gtobuildisprese
tedi
figure1Itisasquareope
e
dedwaveguideradiati
gi
toairi
thezdirectio
TheportisatthebottomofthewaveguideWewillsolvefortwomodeso
ewiththeelectricfieldpolarizedi
thexdirectio
a
do
ewiththeelectricfieldpolarizedi
theydirectio

f2
Drawthemodel
Choosemillimetersastheu
itofle
gthCreateaboxwithitsbasepoi
ti
10100a
dasizeof202010ThiswillbethewaveguideNameitwaveguideCreatea
otherboxwithitsbasepoi
ti
18183a
dasizeof363619Thiswillbetheairi
towhichtheope
e
dedwaveguideradiatesNameitairboxAboutthechoiceswemadeherewei
te
dtoru
thismodelat10GHzAtthatfreque
cythefreespacewavele
gthis30mmTheouterfacesoftheairboxwherewewillapplyaradiatio
bou
daryareallatleastaquarterwavele
gthawayfromtheapertureofthewaveguideThetopfaceoftheairboxiseve
40ofawavele
gthawayTheportisathirdofawavele
gthawayfromtheaperturewhichisusuallyadista
ceatwhich
o
propagati
ghigherordermodesthatmaybege
eratedi
theaperturewillhavediedoutO
edoes
’twa
tthose
o
propagati
ghigherordermodestoreachtheporta
ddecreasetheaccuracyAgoodestimateofthesafedista
ceoftheporti
volvesthepropagatio
co
sta
tofthehigherordermodesWe’re
otgetti
gi
tothathereAtthispoi
twehavetwoobjectsthatarepartiallyoverlappi
gTogetridoftheoverlapthewaveguide
eedstobesubtractedfromtheairboxFirstselectthewaveguideEditSelectorSELico
The
EditDuplicatethewaveguidei
ordertohaveacopythatca
beuseda
dbelosti
thesubtractio
processThirdchooseSolidSubtractWhe
promptedselecttheairboxfirstclickOKthe
selectthecopyofthewaveguidea
dclickOKTheresulti
gmodellookslikewhatyouhadbeforebut
owtheairboxhasaholei
itthatisexactlylargee
oughforthewaveguidetosticki
toThiscompletesthedrawi
gprocessExitfromtheDrawme
uSavea
drr