Download - Fitsum Mergia 1096 03
-
7/27/2019 Fitsum Mergia 1096 03
1/39
7/24/2013 1
-
7/27/2019 Fitsum Mergia 1096 03
2/39
Outline Introduction Types of PTL Theoretical framework Area of Application
7/24/2013 2
-
7/27/2019 Fitsum Mergia 1096 03
3/39
-
7/27/2019 Fitsum Mergia 1096 03
4/39
IntroductionFunctionally Microwave devices are classified as :
Passive Device
Active Device
Planar transmission lineCoaxial transmission line
Klystron/Magnetron
Traveling wave tube (TWT)Gunn/IMPATT/Tunnel/Varactor diodeBJT ,GaAs ,FETS , HEMTSMasen
7/24/2013 4
-
7/27/2019 Fitsum Mergia 1096 03
5/39
IntroductionFunctionally Microwave devices are classified as :
Passive Device
Active Device
Planar transmission lineCoaxial transmission line
Klystron/Magnetron
Traveling wave tube (TWT)Gunn/IMPATT/Tunnel/Varactor diodeBJT ,GaAs ,FETS , HEMTSMasen
7/24/2013 5
-
7/27/2019 Fitsum Mergia 1096 03
6/39
IntroductionTransmission line are essential components in microwavedesign .
Used to transmit m-wavesignal from one-point to another
Construct passive m-wave devices such as directionalcouplers ,filters , power divider ,matching networks etc.
7/24/2013 6
-
7/27/2019 Fitsum Mergia 1096 03
7/39
IntroductionTransmission line are essential components in microwavedesign .
Used to transmit m-wavesignal from one-point to another
Construct passive m-wave devices such as directionalcouplers ,filters , power divider ,matching networks etc.
7/24/2013 7
-
7/27/2019 Fitsum Mergia 1096 03
8/39
IntroductionTransmission line are essential components in microwavedesign .
Used to transmit m-wavesignal from one-point to another
Construct passive m-wave devices such as directionalcouplers ,filters , power divider ,matching networks etc.
7/24/2013 8
-
7/27/2019 Fitsum Mergia 1096 03
9/39
IntroductionTransmission line are essential components in microwavedesign .
Used to transmit m-wavesignal from one-point to another
Construct passive m-wave devices such as directionalcouplers,filters , power divider ,matching networks etc.
7/24/2013 9Directional couplers
They couple a defined amount of theelectromagnetic power in transmission
line to a port. Couple power flowing inone direction.
separating transmitted and receivedsignals on telephone lines.
providing a signal sample formeasurement or monitoring
Applications :
-
7/27/2019 Fitsum Mergia 1096 03
10/39
IntroductionTransmission line are essential components in microwavedesign .
Used to transmit m-wavesignal from one-point to another
Construct passive m-wave devices such as directionalcouplers ,Filters , power divider ,matching networks etc.
7/24/2013 10Harmonic Filter
A harmonic filter is used to eliminate theharmonic distortion caused by appliances.
Harmonic currents provide power thatcannot be used and also takes up electricalsystem capacity.
-
7/27/2019 Fitsum Mergia 1096 03
11/39
IntroductionTransmission line are essential components in microwavedesign .
Used to transmit m-wavesignal from one-point to another
Construct passive m-wave devices such as directionalcouplers ,filters , power divider ,matching networks etc.
7/24/2013 11
Achieve isolation between the output portswhile maintaining a matched condition onall ports.
split one source into two parts for separate
measurements
providing taps for cable distributedsystems such as cable TV
Applications :
-
7/27/2019 Fitsum Mergia 1096 03
12/39
IntroductionFunctionally Microwave devices are classified as :
Passive Device
Active Device
Planar transmission lineNon planar transmission line
Klystron/Magnetron
Traveling wave tube (TWT)Gunn/IMPATT/Tunnel/Varactor diodeBJT ,GaAs ,FETS , HEMTSMasen
7/24/2013 12
-
7/27/2019 Fitsum Mergia 1096 03
13/39
IntroductionFunctionally Microwave devices are classified as :
Passive Device
Active Device
Planar transmission lineNon planar transmission line
Klystron/Magnetron
Traveling wave tube (TWT)Gunn/IMPATT/Tunnel/Varactor diodeBJT ,GaAs ,FETS , HEMTSMasen
7/24/2013 13
-
7/27/2019 Fitsum Mergia 1096 03
14/39
Introduction
7/24/2013 14
a) Non-planar transmission lineb) Planar transmission line
Classification of transmission line
Depending on the element that characterize the transmission line thetransmission line can be categorized as planar and non planar.
b ) Non planar transmission linea ) Non planar transmission line
= 138 log d D
1
= 12 12 1 12. 0.04 1
= 2 ln 8 0 25
-
7/27/2019 Fitsum Mergia 1096 03
15/39
Introduction
7/24/2013 15
a) Planar transmission lineb) Non-planar transmission line
Classification of transmission line
Depending on the element that characterize the transmission line thetransmission line can be categorized as planar and non planar.
a ) Non planar transmission line
b ) Non planar transmission line
= 138 log d D
1
= 12 12 1 12. 0.04 1
= 2 ln 8 0 25
-
7/27/2019 Fitsum Mergia 1096 03
16/39
Introduction
7/24/2013 16
Basic characteristics of Planar-transmission line
PTL has one or more parallel metal strips placed on a dielectric substrateover a conducting ground plane.
PTLs are fabricated using conventional printed circuit boardstechniques. good mechanical tolerances low cost. PTLs transmission lines are preferred for microwave integrated circuits
(MIC)
-
7/27/2019 Fitsum Mergia 1096 03
17/39
Outline Introduction Types of PTL
Theoretical framework Area of Application
7/24/2013 17
-
7/27/2019 Fitsum Mergia 1096 03
18/39
Types of PTLThere are different types of planar transmission lines :
7/24/2013 18
2. MICROSTRIP LINE1. STRIP LINE 3. SLOT LINE
4. COPLANAR LINES
These are the commonly used planartransmission lines
-
7/27/2019 Fitsum Mergia 1096 03
19/39
Types of PTLThere are also other variety of PTLs :
7/24/2013 19
SUSPENDED STRIPLINE FIN LINE INVERTED MICROSTRIP LINE
-
7/27/2019 Fitsum Mergia 1096 03
20/39
Types of PTLComparison between PTLs :
7/24/2013 20
characteristics Micro strip Line Slot Line Coplanar Lines
Impedance range [] 15-120 50-300 25-155Frequency range (GHZ) 0-60 3-60 0-60, 2-20 10-20 2-20Dispersion Small Large Medium
Attenuation loss Low high Medium
High Low Medium
-
7/27/2019 Fitsum Mergia 1096 03
21/39
Outline Introduction Types of PTL
Theoretical framework Area of Application
7/24/2013 21
-
7/27/2019 Fitsum Mergia 1096 03
22/39
Theoreticalframework
7/24/2013 22
Micro strips: Geometrical characteristics
W- the width of the hot conductor
h- the substrate height t- the conductors thickness
Where
-
7/27/2019 Fitsum Mergia 1096 03
23/39
Theoreticalframework
7/24/2013 23
Micro strips: Electric and magnetic field lines
homogeneous structure:
The field lines between strip and ground plane are not contained entirelyin the substrate. Hence mode of propagation is not purely TEM , But quasiTEM
-
7/27/2019 Fitsum Mergia 1096 03
24/39
-
7/27/2019 Fitsum Mergia 1096 03
25/39
Theoreticalframework
7/24/2013 25
Micro strips:
Attenuation
Losses
Its finite Conductibility Its finite resistivity of the substrate and its dumping phenomena Its radiation effects
conductor loss constant
= 2
= [mean power dissipated] = [transmitted power ]Where
Dielectric loss constant
= 20ln101
11 1 tan
-
7/27/2019 Fitsum Mergia 1096 03
26/39
Theoreticalframework
7/24/2013 26
Micro strips:
Practical considerations
Lumped inductors and capacitors
Design of inductors
The elements physical dimensions are much smaller than the freespace wavelength of the highest operating frequency .
High-impedance line
Square spiralCircular spiral Meander line
-
7/27/2019 Fitsum Mergia 1096 03
27/39
Theoreticalframework
7/24/2013 27
Micro strips:
Practical considerations
Lumped inductors and capacitors
Design of inductors
The elements physical dimensions are much smaller than the freespace wavelength of the highest operating frequency .
High-impedance line
Circuit Model
nH = 2x10l ln lW t 1.1930.2235 W tl k
= 2( ) 1 40 217ln 5 For
-
7/27/2019 Fitsum Mergia 1096 03
28/39
Theoreticalframework
7/24/2013 28
Micro strips:
Practical considerations
Design of capacitor
Metal-insulator-metal (MIM) capacitor
Circuit Model =
= ()
Interdigital capacitor Metal-insulator-metal (MIM)capacitor
-
7/27/2019 Fitsum Mergia 1096 03
29/39
Theoreticalframework
7/24/2013 29
Strip line: Geometrical characteristics
W- the width of the hot conductor
h- the substrate height
t- the conductors thickness
Where
-
7/27/2019 Fitsum Mergia 1096 03
30/39
Theoreticalframework
7/24/2013 30
Strip line: Electric and magnetic field lines
The dominant mode is TEM
-
7/27/2019 Fitsum Mergia 1096 03
31/39
Theoreticalframework
7/24/2013 31
Strip line:
Design equations
The characteristics Impedance:
= 30 0.441
-Effective width of the central conductor
Where
The characteristic impedance decreases for increasing values ofthe parameter / bThe effective width is obtained from:
= -
0
0.350.35
-
7/27/2019 Fitsum Mergia 1096 03
32/39
Theoreticalframework
7/24/2013 32
Strip line:
Design equations
= - 0 0.350.35 120
-
7/27/2019 Fitsum Mergia 1096 03
33/39
Theoreticalframework
7/24/2013 33
Strip line: :
Attenuation
conductor loss constant
= .() 120. 120Where
Dielectric loss constant
tan
2
thickness of the strip =t
-
7/27/2019 Fitsum Mergia 1096 03
34/39
-
7/27/2019 Fitsum Mergia 1096 03
35/39
Outline Introduction Types of PTL
Theoretical framework Area of Application
7/24/2013 35
-
7/27/2019 Fitsum Mergia 1096 03
36/39
Area of ApplicationApplication-1 :
7/24/2013 36
Microwave resonator : filter circuits that are used in communicationssystems for frequency band selection.
the single shunt micro strip with the quarter-wave stub is a seriesresonant circuit, which means that it blocks the input signal frompassing through to the output at the resonant frequency.
Ana Keef
https://plus.google.com/115073543672878130711https://plus.google.com/115073543672878130711https://plus.google.com/115073543672878130711 -
7/27/2019 Fitsum Mergia 1096 03
37/39
Area of ApplicationApplication-2 :
7/24/2013 37
Butterworth Low Pass Filter: is (maximally flat) low pass filter usingstepped-impedance micro strip lines.
These filters were designed to have a 3GHz cutoff frequency and a largeinsertion loss at 6 GHz.
-
7/27/2019 Fitsum Mergia 1096 03
38/39
Area of ApplicationApplication-3 :
7/24/2013 38
3dB Wilkinson power divider : is a three port device and it splits theinput signal into two output signals.
Power dividers are passive componentsthat split the input signal into equalamplitude and equal phase outputs.In the 3-dB Wilkinson power divider theoutput signals are 3 dB below the inputsignal and the phase shift between the
outputs is 0.
-
7/27/2019 Fitsum Mergia 1096 03
39/39
Thank you !
7/24/2013 39