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EXAMINATION 07 April 2011

United States Naval Academy

Electrical and Computer Engineering Department

EE 372

Exam 2

7 April 2011

1. You must present your work completely and legibly to receive partial credit. You must show sufficient steps to justifY intermediate results as well as final answers.

2. Put all your work on the exam. If you need more space than that provided, ask your instructor for paper. Write your answer clearly and use appropriate units. You have one hour and 50 minutes to work this examination.

Problem

1

2

3

4

Questions

Total

Value

25

25

25

25

25

125

Score

I have neither given nor received assistance while completing this exam.

Signed and date

1

EXAMINATION 07 April 20 II

(1) (25 points) Design a microstrip matching network WITH A SMITH CHART using a stub terminated with a short to match a 500hm load to a 200-j200 ohm input impedance as shown below. The characteristic impedance of all microstrip lines must be 50 ohms.

State all lengths as fractions of a wavelength.

ZL=50 Q

r---t----'-----~

t;~ ~

Zin 200 - j200 Q

-2t.

I

X

1=

I

'/1....· /:: O. 12

<"' f . /'"\

,/-, ('. r _

Ie

'II. /

C-~.Yl

"ro

It'~ /

-L C c::

G

~ 0/ -/-~£').

rc/ev/~ C~

0/)/'/

~~ <?6k.t,;

C/O::

0*

)j/::-

0 ( )

-)2.SS­

2

The Complete Smith Chart

Black Magic Design

IW)I/\U.Y~AI.I!tIPA~~"

'

'roWARD LOAD - ­

11.&1.61.4 U U 1 U 1 0 7 5 10 ~ U

<TOWA1!D Gl!NI!RATOIt

1 1

15 10 8 1.1 U U 1.4 1.6 1.1 1 • 5 10 10 ­

)

6 5 4 a

9 1 0 1 2 If 0.10.2 6 7 10 U 0.60.81 U . 5 6 101500

1 0.9 o.a

0.7 0.6 o.s

0.4 ~

(U

'--w........

~O.:....9~.........;O'S:i:.LU

,0.,7, , •

,.,6, . ,

,Of>, •• ,0;., • ,

0.1 0.05 0.01 00 1.1 1.l 1.3 1.4 U 1.6 1.7 U 1.9 2

:us

4 5 10­

.Of>. ,

L..:0i:..l'-'-o...LjO'ul-'-'...

0:,j,l=--......;.O;;.;.99-'-~.~.J..'!S.:...,.J..~ ..:.,OL{J_-'-~CUI:;::.~-..:0L?-'-'..;..0i:.~

...

..J.0;4~,

""Of> U 0.1 0 0_

0.2 0.4 0.5 0.6 0.1 0.9

CI!N'Il!R

I U U

I • • , • I • , , , , , , , • • • , , • , , , , , • , L ' • , , • • , • , , • • • , • • , • , , I • , , • , , , , , , , , , • , • , , , • • • , , , , , , • , , , , , , • , . . .

1.8 1.9

~'-'-'-'-''-"-'

........- ' - - /

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