1.Introduc Tion to Microwave Engineering

8/19/2019 1.Introduc Tion to Microwave Engineering

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INTRODUCTION TO MICROWE ENGINEERING

LECTURER: TRAN THI HUONG


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Freuenc! "esi#nation4

$/band +1+ / +12 )H'

"/band 314 / %156 )H'

/band 6176 / 713 )H'

8/band 713 / +319 )H'

:u/band +319 / +7 )H'

:/band +7 / 3414 )H'

:a/band 3416 / 9& )H'

;/band 6& / 26 )H'


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Outline5

Microwave Band

Microwave Applications

Differences between Audio and Microwave Amplifier

Phenomena at High Frequency

Units

Properties of Materials

Modern Microwave ircuits!"ystem Design

#ransmission $ine


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$$ortunities %or Microwave a$$licatio

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Antenna gain is proportional to the electrical si'e of the antenna More bandwidth can be reali'ed at higher frequencies higher At 4&& MH' += bandwidth * 4MH'

4Mbps -binary phase shift >eying modulation.

At 4& )H' += bandwidth * 4&&MH'

4&&Mbps Microwave signal travel by the line of sight and are not bend by t

Possible for satellite and terrestrial communication lin> with h

es


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$$ortunities %or Microwave a$$li

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#he radar cross section of a radar target is proportional to the targete

microwave frequencies proper for radar system

;arious molecular@ atomic and nuclear resonances occur at microw

variety of unique applications in

#he area of basic science ,emote sensing

Medical diagnostic and treatment

Heating method


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Microwave a$$lications

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ellular phone 7&&!5&& MH'@ 319 )H' Microwave oven 319 )H'

Police radar 8/band@ :/band

Military radar 8@ :a@1

ommunication lin>s "@ :u@ :a


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Outline9

Microwave Band




Units



#ransmission $ine


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Di%%erences )t*' Au"io an" Microwave A

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Audio amplifier Freq range +&/3& :H'

Power +&< more

)ain 7&dB

0oise Power line noise@ white noise

Cnput impedance Usually high

utput impedance low to drive 7@ +4ohm spea>ers

"tability usually stable

Microwave ampl

Eample + to 9 )H'

m<

+&/%&dB

"pecified in terms of ntemperature

Must be matched to tr

characteristic impedan

Usually 6& ohm

;ery important


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Outline12

Microwave Band




Units



#ransmission $ine


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,heno+ena at -i#h Freuenc!

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Reflec!ion from an unma!c"ed load

Mirror

Incident

Reflected


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,heno+ena at hi#h %reuenc! &

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#!anding wave$

Device 1 Device 2

Mirror Mirror

| Voltage |

Large reflection

| Voltage |

No reflection


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Outline15

Microwave Band




Units



#ransmission $ine


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Units16

%ime:nsec -nano second. +&/5

s psec -pico second. +&/+3 s

&ower: dBm -dB milliwatts. ( +&log-Power!+m


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Units &Cont'(17

'ol!age and #(parame!er$:3&log S ++ S ++*&1+ ///I /3& dB

S 3+*+& ///I 3& dB gain

*** Important *** dB is a relative value.

)eng!": meter@ cm@ millimeter


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Outline18

Microwave Band




Units



#ransmission $ine


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Con"uctivities %or .o+e Materials19


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,h!sical Constants20


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Dielectric Constants an" /oss Tan

l C "


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Dielectric Constants an" /oss Tan

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,ro$erties o% .o+e Microwave Ferrite Mat

23


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Mo"ern Microwave Circuits0.!ste+ De

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+1 Analysis approimations and simple formula

31 "imulations -most important. HFSS simulation ircuit models

EM model

reate a physical model then simulate the EM interaction with the

el

%1 Fabrication and testingMicrostrip #$ and strip #$

0etwor> analy'er

#D, -time/domain reflectometer.

Antenna range


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Trans+ission /ine e%%ects

Frequency 3&H'/3& :H'

Power level +/+&&<

utput device "pea>er -convert audi

o JelectricK signal to acoustic waves.

Cmpedance 9 / 7 ohm Power Amplifier utput impedance o

f power amplifiers ( low

onnection between spea>er and amp

lifier copper wire -3 conductors.

re,uenc-: &ower level: 1

u!pu! device: An!enn

$ignal

u!pu! impedance i$ u

d !o a 50 o"m

R Amplifier: u!pu!

R amplifier mu$! e

of %)

+onnec!ion e!ween R

d an!enna: coaial ca

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Audio #-$!em R radio fre,uenc-


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Trans+ission /ine e%%ect &Cont'(

Frequency 3&H'/3& :H'

Power level +/+&&<

utput device "pea>er -convert audi

o JelectricK signal to acoustic waves.

Cmpedance 9 / 7 ohm Power Amplifier utput impedance o

f power amplifiers ( low

onnection between spea>er and amp

lifier copper wire -3 conductors.

re,uenc-:

&ower level: 1

u!pu! device: An!enn

$ignal

u!pu! impedance i$ u

d !o a 50 o"m

R Amplifier: u!pu!

R amplifier mu$! e

of %)

+onnec!ion e!ween R

d an!enna: coaial ca

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Audio #-$!em R radio fre,uenc-


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TEM Trans+ission /ine31

"pea>er wire -3 conductors.

3&/3&@&&& H'

arry audio signals

oaial cable

Up to 34 )H'

Cnstrumentation@ com

& (


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TEM Trans+ission /ine &Cont'(32

"trip $ine Microstrip $ine oplanar wave gui

Microwave band

Printed circuit board -PB.

h " "


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-i#her1or"er Mo"e Trans+ission /33

,ectangular wave guide ircular

1.Introduc Tion to Microwave Engineering

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