CST Tutorial Microstrip

5/24/2018 CST Tutorial Microstrip

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A Brief Introduction for Designing a Patch Antenna Using CST

1. Accessing CST MWS

a. From start menu select Programs > CST STUDIO SUITE 2006 > CST

DESIGN ENVION!ENT

". T#e ma$n %$n&o% s#o%n $n F$g. ' %$ll "e o(ene&

c. From t#e ma$n %$n&o% cl$c) on *CST !$cro%a+e Stu&$o, $con t#en cl$c)

O-

F$g. ' CST ma$n %$n&o%

&. ne% (o(/u( %$n&o% calle& *Create a Ne% (roect, %$ll a((ear1 rom t#$s

%$n&o% t#at s#o%n $n F$g. 2 3ou can select t#e t3(e o (roect 3ou are

%or)$ng on1 $.e. ntenna 4on (lanar su"strate5 $n case o &es$gn$ng a

Click Here

then click OK


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m$crostr$( (atc# antenna or ntenna $n ree s(ace $n case o &es$gn$ng a

&$(ole or a mono(ole.

Note: the purpose from selecting the project type is to adjust the boundary

condition automatically, if you dont like this you can select None andyou can adjust the boundary conditions later.

F$g. 2 Create ne% (roect %$n&o%

e. ter cl$c) on O- t#e ma$n la3out %$n&o% %$ll a((ear as s#o%n $n F$g. .

No% %e nee& to g$+e a name to t#e (roect an& sa+e $t.

. From !a$n !enu select > F$le > Sa+e as1 no% 3ou s#oul& %r$te t#e name o

3our (roect $n t#e s(ec$$e& area e.g. *ectangular Patc#, as s#o%n $n F$g. 7


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F$g. !a$n 8a3out %$n&o%

F$g. 7 Sa+$ng t#e %or)$ng (roect

Write the

project

name here


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2. Rectangular patch antenna design

Step 1 specifying the project units

From ma$n menu select > Sol+e > Un$ts1 t#en rom t#e un$ts %$n&o% select

t#e &$mens$ons to "e $n mm1 Fre9uenc3 $n G:; an& t$me to "e $n ns as s#o%n $n

F$g.


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Step 2 Assigning the Background aterial

From ma$n menu select > Sol+e > =ac)groun& !ater$al1 No% a ne%

%$n&o% calle& *=ac)groun& (ro(ert$es, %$ll (o( u(. C#oose !ater$al t3(e to "e

normal an& )ee( all ot#er (arameters as t#e &eaults as s#o%n $n F$g. 6

F$g. 6 =ac)groun& mater$al &e$n$t$on

Step ! Antenna su"strate definition

From ma$n menu select > O"ects > =as$c S#a(es > =r$c)1 T#en &ou"le

cl$c) on t#e %or)$ng area an& &rag t#e mouse an& &ou"le cl$c) aga$n to en& t#e

&ra%$ng mo&e. No% a ne% %$n&o% calle& *=r$c), %$ll a((ear1 rom t#$s %$n&o%

t#at s#o%n $n F$g. 3ou can a&ust t#e re9u$re& &$mens$ons o t#e su"strate1 $ts

name an& $ts mater$al.

In t#$s (roect %e nee& to a&ust t#e su"strate &$mens$ons to "e '00?'00

mm2"3 c#ang$ngXminto "e /


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F$g. Su"strate &e$n$t$on

F$g. A C#ang$ng t#e !ater$al o t#e su"strate to T


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Step # Antenna ground definition

For t#e antenna groun& 3ou nee& to create anot#er "r$c) *same as state&

"eore, %$t# a +er3 t#$n t#$c)ness4I c#oose $t to "e 0.' mm5 as s#o%n $n F$g. an&

c#ange $ts mater$al to "e co((er

F$g. &&$ng t#e groun& (lane o t#e antenna

Step $ %ra&ing the radiating patch

To &ra% a rectangular (atc# create anot#er "r$c) %$t# t#e ollo%$ng

(arameters Xmin 4/7.7251 Xmax 47.725 an& min 4/7'.251 max

47'.25. n&!min 01!max 0.' an& ass$gn $ts mater$al to "e co((er as s#o%n

$n F$g.'0.

Step ' %ra&ing inset feed slot

Create a "r$c) %$t# t#e ollo%$ng (arameters Xmin 4/7'.251Xmax 4/7'.2 '7.


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F$g. '0 Dra%$ng t#e ra&$ator (atc#

F$g.'' Dra%$ng t#e $nset ee& slot


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Step ( Cutting the inset feed slot fro the patch

a. From t#e let (ane cl$c) on *Coponent1)to s#o% all t#e com(onents o 3our

(roects

". Cl$c) on (atc# to select $tc. Cl$c) on *=oolean su"tract 4/5, $con rom t#e tool"ar1 see F$g.'2

&. No%1 cl$c) on slot an& (ress enter )e31 see F$g. '

e. ou s#oul& no% see somet#$ng loo)s l$)e F$g.'7

F$g. '2 Cutt$ng t#e $nset ee& slot rom t#e (atc# 4a1"1c5

Boolean

subtract

icon

Select

Patch


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F$g. ' Cutt$ng t#e $nset ee& slot rom t#e (atc# 4&5

F$g. '7 Cutt$ng t#e $nset ee& slot rom t#e (atc# 4e5

Select

slot


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Step * %ra&ing the $+ oh feed line

Create a "r$c) %$t# t#e ollo%$ng (arameters Xmin 4/7.A


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Step , Merging the feed line &ith the patch

a. From t#e let (ane un&er "omponent #su"/menu cl$c) on$eedline t#en #ol&

t#e ctrl)e3 $n t#e )e3"oar& an& cl$c) on%atchto select "ot# o t#em

". From t#e tool"ar cl$c) on *=oolean a&& 45,1 see F$g.'6c. No% t#e3 are merge& toget#er an& "ecome one com(onent as s#o%n $n F$g.'

F$g.'6 !erg$ng t#e ee& l$ne %$t# t#e (atc#

Boolean

Add icon

Select

feedline

and Patch


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F$g.' T#e ee& l$ne an& t#e (atc# ater merg$ng

Step 1+ %efining the &a-e port for the antenna

a. From ma$n menu select > Sol+e > %a+egu$&e (orts or "3 cl$c) on %a+egu$&e

(orts $con $n t#e tool"ar

". From t#e &a'eguide(ort %$n&o% selectNormal to "e

c. Select ree $n t#e (os$t$on "o@ an& enter t#e ollo%$ng &$mens$ons or t#e %a+e

(ort H Xmin /201Xmax 20 an&!min /'.


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F$g.'A De$n$t$on o t#e %a+e (ort

F$g.' De$n$t$on o t#e %a+e (ort

Select Y

Select

ree

Check free

normal

position


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Step 11 %efining the siulation freuency range

a. From ma$n menu select > Sol+e > Fre9uenc3 or "3 cl$c) on re9uenc3 range

$con $n t#e tool"ar

". Enter t#e re9uenc3 range o 3our s$mulat$on as$min'1$max< t#en cl$c) o)

F$g.20 De$n$t$on s$mulat$on re9uenc3 range


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Step 12 Adding radiation pattern and surface current to your siulation results

a. From ma$n menu select > Sol+e > F$el& !on$tors or "3 cl$c) on $el& mon$tors

$con $n t#e tool"ar

". From !on$tor %$n&o% select$arfield+"- or (lott$ng t#e ra&$at$on (attern an&t3(e t#e mon$tor$ng re9uenc3 4$n t#$s e@am(le $t $s 2.7 G:;5 t#en cl$c) a((l3

as s#o%n $n F$g.2'

c. To (lot t#e surace current &$str$"ut$on select (field+-urface current an& t3(e

t#e mon$tor$ng re9uenc3 t#en cl$c) a((l3

F$g.2' &&$ng ra&$at$on (attern4s5 an& surace current to t#e s$mulat$on results

!onitoring

fre"uenc#

ield

monitor

icon


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Step 1! Running the siulation

a. From ma$n menu select > Sol+e > Trans$ent sol+er or "3 cl$c) on Trans$ent

sol+er $con $n t#e tool"ar

". Form trans$ent sol+er %$n&o% 3ou can a&ust t#e sol+er accurac3 *t#e errormarg$n, $n t#$s e@am(le I c#oose $t to "e /0 &= t#en cl$c) start as s#o%n $n

F$g.22

F$g.22 unn$ng t#e trans$ent sol+er

Notes:

#. /ncreasing the accuracy resulting in slo&er simulation

0. 1here are more sol'ers in "-1 package like fre2uency domain sol'er and eigen

mode sol'er but in this example &e choose only the transient sol'er to be

presented

$ransient

sol%er

icon


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Step 1# %isplaying the siulation results

a. To s#o% t#e S/ (arameter cur+es 4$.e. l$near1 &=1 (#ase1 sm$t# c#art1.. 5 go to t#e

let (ane t#en cl$c) on #3 esultst#en select t#e cur+e 3ou %ant to &$s(la3 as

s#o%n $n F$g.2

". To s#o% t#e current &$str$"ut$on (lots go to t#e let (ane t#en cl$c) on 03+43

esultst#en select Surace current > #/$el&s as s#o%n $n F$g.27

c. To s#o% t#e ra&$at$on (attern4s5 (lots go to t#e let (ane t#en cl$c) on 03+43

esultst#en select Far$el&s > ar$el& 42.75 as s#o%n $n F$g.2 VSJ to

s#o% t#e (lot as s#o%n $n F$g. 2

F$g.2< D$s(la3$ng t#e (ost (rocess$ng results 4a5


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F$g.26 D$s(la3$ng t#e (ost (rocess$ng results 4"5

F$g.2 D$s(la3$ng t#e (ost (rocess$ng results 4c5


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References:

For &eta$ls o CST &ocumentat$on 3ou ma3 seeH

http://www.cst.com/Content/Products/MWS/Overview.aspx

Documents

CST Tutorial Microstrip