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Metingen aan een aangepaste en onaangepaste symmetrische bifurkatie in het H-vlak van een dubbelbrede 3 cm golfpijp

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Metingen aan een aangepaste en onaangepaste

symmetrische bifurkatie in het H-vlak van een dubbelbrede 3

cm golfpijp

Citation for published version (APA):

Vermeulen, J. G. M. C. (1965). Metingen aan een aangepaste en onaangepaste symmetrische bifurkatie in het H-vlak van een dubbelbrede 3 cm golfpijp. Technische Hogeschool Eindhoven.

Document status and date: Gepubliceerd: 01/01/1965

Document Version:

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(2)

TECHNISCHE HOGESCHOOL EU,'"DHOVEN AFDELING ELE;1{'rROTECHNIEK.

RAPPOR'f 1

METINGEN AAN li:EN AANGEPASTE EN ONAi'lNGEPASTE

SYlv!METRISCHE BIFURKATIE IN HEiT H- VLAK VAN BEN DUBBF~LBREDE

3

em GOLFPIJP.

door

Mei 1965~

(3)

1 ~ Inleiding, 2~

Bepaling

van 3 11

3 ..

ing

van 8 22 ,

4.

Bepaling

van 2

(4)

1.

Inleiding<

Op verzoek van L.Esser z1

bifurcatie in het H-vlak,

afstudeerverslag.

D

er me

cht aan E;911 S::rm.riletriscJl~

.

.

.

aangegaven

In ZlJD

We hebben de stro6imatrix d ·,,,elk!? he t

verbano

geeft t\l.8Sen de symmetd,sche eomponent Vc .... "l de 0 mode in u.~ p8rallel1e pijpen

1 ! d m1 ", d "

A "

b' l' - d '1 J' p.

I' .

1.'; f..-,,',' 1 e'."" ';.

en en.e 'l'~'lO rna e In (1", O.U r)e.o""'~\e go _ .l.'~r' • L

r=

----,

I ' , I ' f _._._ ... ( ="""""""~...,."",.,.jl_. _ . _ . ~g.L f

t ' . ,

' a

I I I I

10

?.

flc1n

p.aSSI

ngs«ichroef

:

1

;-t-l

I . Co ... '-·I-I---""""""i · 0 - · 0 - 0 - · J-U~ 1,' I r

a,

I r I~

'a

a.

De a.anpassingsschroef in

~2 dient om bij een de frequentie

de refleetie! 8 tengevolge van de discontinue ov,::rgazlg op te heffen. De invloed van de aanpassings

vergeli,jking van de mat::ri.ce voor

De

metingen

zijn verricht in het

stappen van

50

I,~Hz.

iJ

Afstwieerverslag L. Esser 'fechni sche

te constateren door

ties volgen~ Fig. ' en 2. ied

van e600

tot

9700 MHz

(5)

l-'"

r-D ...

bbeL~re.de ~o~_me.l

l:'~

a.

V'l

p

a

":><::>"III'l3,

sc:.c.

h

'(Ioe:Je'fl

I

.

.

i

~"'3

3.

1 - - - -

r--.--f---

- -

-

- -

-

-

'

-o

ver~V)~ ~a.tLeJiU£~~~

__

·(L~laJ~

__ _

clu

bbe.L

b~~4e ~o\'t f2\~

; - - - ' "

--

P

---

---

--1

..-

-~

I

I

.r

-dD-

t

---~-

-q?--

--i - - -

----

I--~-

-I

I

I

-

-

--

--

-4-

-

- - - -

--

I--I

--

----

-

-" - -

--

' - -

(6)

-.

< I

Voor het bepalen -van 8

11 is het nOQd:;~akeli.jk dat de sib'11alen via

len 11 aan de overgang gelijke fase en amplitude aallkomen.,

Fig. 1

Om dit te verwezenli verva.ngen we de belasting deor

een sehe overgang 'Ian dubbelbrede naar

3

em golfpijp< Hieraan bevsstigen we een

kristaldetector.

De

er en verzwakkers stallen we zodanig in dat de detector

geen 8 waarneemt. De genoemde si€,rnall!m zijn dan ge1 i jk in amplitude doch in

Vie vinden een. nulpunt omdat in golfpijp 2 dan enkel de IE,,,,), mode

(:\.

optreedt, welke door hat volledig gereflecteerd llordt.

o

Nu verdraaien we de fasedrt'lsier 160 ZOd8.t de s en gelijke

en amplitude hebben.

Dal~.rna. plaatsan we achtf.lr piJpdeel 2 een k dubbelbrede pijp en

aluiten dit

karakteristiek af. Fig.,. \,

We kunnen nu met de sta~mdegclfmetElr een maxin:mm en een minimum

We zorgen hie1"bij dat het nHndmuw. nie t er is dan

3

1ftV' om niet

buiten het kwadratische

va."1 de

kara.kteristlek

van

net

kri

te kO!n!',m.

VerdeI'

bepa1en

we de aats van hf.,t minimum eli t dcen we door l:i

en

v-an het minimum. oi j gel ijke de plaats te

bepalen.

1.3.

Z

> vinden we dan met ~

m~n.

4

We vinden S'1 volgens

TI

T-

-j e ( 2

, J.l

Q

20 S~1

.

,

"'_._-Waari:n

~

'" '. j 1

plaats van E;'€:rI minimur.~ va.n }H::t staandegolf

1E mode

(7)

plaatsaanduid

van de staandegolfmeter 1

verschoven t.

o. \i.

het

gekozen co8rdinatensysteem.

verschillen aldus een constant

met d.e

De gemeten

Qvereenko1ll8

plaats in het

Z€m co(5rdinatensysteern~

Om nu. de werkeli

Z.

te bepalen sluiten we

mll1 pdee11 kort

Fig.

1.4.

We lezen nu af

a.

1']0

bij f '" MHz Z'. -

76,4

mm.

m~n

Met 2

IJ20 ~ -

n

waarin n eeh geheel getal is bepalen we ZO .

mJ.n

Hier'oij is

,

de werkelijke met de gemeten

zt

ill:!..!) waarde. We vinden mm. De

gemeten

Z. corrigerer; we

nu

IDl.n

z

~ IDln gecoor. (r' t

\'" min

Z I . m1U ,.,0 \

'" min'

'.

corresponderende

(8)

! ! . t ~~---~---~r-~~ I

2

f t . I I

Z:O

z

v

1

I I -I I

I

I I

Z

rn-tn:

71

-r

Z2

t

7

3 -)-

Z~

Lt

da~fa?~~~?~~~poe?

V

z,

=

VZ'l.

VZ3

-=.

'17

1

z

(9)

Om

te bepalen wordt ar gemeten aan een opstell weergegeven in Fig 2.1.

We moeten via ee11 symroetrische overgang (pi,jpdeel

3)

van €lnkele naar

dubbelbrede pijp. Fig.1.2.

Aldus treedt in de dubbelbrede jp enksl de TE._ mode op~

,0

In de dubbelbrede pijp is een staandegalfmeter opgenomen We vinden volgensf

U

WasTin

1;

staande go. in pijpdeel ~. Pi

.

.

z .

mln

plaats vall een minimum VEL.l1 hat fpab"oon.

,,..

-.---12

+ 1

fsse constante van

TE.

mode in pij 10

(6)

en

We moeten hier echt'er oak Z 1 gemeten corrigeren. m. n

Hiervoor 31ui ten we nu pi jpdeel 2 kart hi j Z "" 0 van het zen

coord • Fig.2. , We viuden nu bij f '"

confi6~ratie zender schroef Fig.

Z' . n1J.n

We benalen Z. voigensl

r !!ll,n

Z .

!!lll'l

gecorr

"" Z .

unn gemeten

min ( ,/ I ... u ' . • Jnl.n l

.

'

.

- Z

waari.n n o ') min (8) I,iHz voor de el getal ~ vi.nden

Voer de configura tie met scbroef 13 een golfpijpstuk met

asnpBBsingsBchroef opgenomen. L '" 70, 1

mm.

Aldus voigt • . "" Z . !l11J'l gemeten·

€len lengte

(10)

~'j

2.1

Z

o

.

n

TT

VVlI V}

=.

-'2Ao

z

< 1

-z

- - 0

1

\Iv\ \ Yl::.

1~

\

5

m m

z=.()

I

i

9

I

2. I

I-~.u..u..;.!\

Af

S\.I.o·I\:

\n~ I

t

I

aanf~~~~s~~~~oe~

(11)

va.n

We vinde:n 8

12

uit:

1)

(5 12

)2 ""

e

j (2

1 "" lengte pij

plaats van een minimum bij kortgesloten

Uit vergelijk (10) v::1 18

121

en Arg 512

jp 1

...

': I

Om :2

fj",o

Z. +l'C te len hebben VHe; pijpdeel 1.1 f kortgesloten

I IDll1

en vervolgens een m:i.nl.mum

Ook

hier moeton

Vie (il;; gE:1f'.lS

ten

Z

corrigeren

zoals :in hoof:atuk ' )

min

,,::: ~

Zie }"i[{ ~ 2.2 en

"

.t:.: .... ,) " fo

De fout in/s12lwordt nu enkel

door de me

st8sndego 1 fv erhoud

er;-r,.,

<.

Terwijl de fout in

I

ver~eliJking

(10)

en in de

ld. wordt <loor

de meetfQuten in at taen van mir.ima

voor de bepa.l van. 8'1 ~ Sr,,.., en Z .

Co c. rill!'! •

Hat is duidelijk det we met de vergelij (11) een grotere

I1IUJwkeurignei.d bereiken.

Arg -

'It

(12)

Arg S12

= ----~~----.--~~----2

(12)

1=0

...-+-_-I-_...!I _ _

-11

ca.)

I - 4 - - j () I { " I

Z

... ---...

~lysl:ron

Z:::O

I I J I 1

I

I I

Cb)

~

I

2.:

I I 1 J

"'"

I.

L

.e

~ I 1100 1"",

,

--IJ1D>j

Z

\

(13)

5.1

De gemeten en berekende wearden van de te bepalen groothedi;~n z:i,jn op de h:l.erna volgende pagitJH' s 5.2

tim

5.13 yermeld.,

Verder de

gl'oothedenlS12

t ' S ..

,

-t

,

en

Arg S ala functie van de fre

22 ie uitgezet.

2 zijn 01)

twae

wal1ieren bepaa.ld nI f.

a) met behulp

van verg. (1 .. C n ) I '

b)

met behulp

van verg.

(11 ) en (12) •

3.Vermeulen.

(14)

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Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of

Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of

Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of

Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of

Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of

Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of