directional coupler using mwo
TRANSCRIPT
Directional Coupler Circuit Design & Analysis using Microwave Office
By: Manjunatha [email protected]
Directional Coupler
Directional Coupler
Directional Coupler
Example 1:
Design a 20dB coupled line coupler in microstrip, characteristic impedance of 50 Ohm,and a center frequency of 9GHz. Plot the coupling anddirectivity from 5 to 13GHz.
1. Create New Schematic Shown Below
2. Go to Elements Tab
3. Select MicrostripsLinesCoupled LinesJunctions
Complete Directional Coupler Schematic
MSUBEr=2.6H=0.504 mmT=0.018 mmRho=1Tand=0.002ErNom=2.6Name=SUB1
MLINID=TL1W=1.37 mmL=5 mm
W
W
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3
4
MCLINID=TL3W=1.344 mmS=0.664 mmL=5.68 mm
MLINID=TL4W=1.37 mmL=5 mm
MSTEP$ID=TL5
MSTEP$ID=TL2 MSTEP$
ID=TL6
MLINID=TL7W=1.37 mmL=5 mm
MSTEP$ID=TL8
MLINID=TL9W=1.37 mmL=5 mm
MBENDID=TL10W=1.37 mmANG=90 DegM=0.6
MBENDID=TL11W=1.37 mmANG=90 DegM=0.6
PORTP=1Z=50 Ohm
PORTP=2Z=50 Ohm
PORTP=3Z=50 Ohm
PORTP=4Z=50 Ohm
Add MSUB Substrate bloc
View the complete Layout of Directional Coupler Layout
Add Graph
Right click & select add MeasurementThen Choose S11, then Apply, S21 etc
Directional Coupler Simulation ResponseSimulate the design for 5 to 13 GHz in steps of 0.1
5 7 9 11 13Frequency (GHz)
Graph 1
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-30
-20
-10
0DB(|S(1,1)|)Directional Coupler
DB(|S(1,1)|)Directional Coupler EM Extract
DB(|S(1,1)|)EM_Extract_Doc
DB(|S(2,1)|)Directional Coupler
DB(|S(2,1)|)Directional Coupler EM Extract
DB(|S(2,1)|)EM_Extract_Doc
DB(|S(3,1)|)Directional Coupler
DB(|S(3,1)|)Directional Coupler EM Extract
DB(|S(3,1)|)EM_Extract_Doc
DB(|S(4,1)|)Directional Coupler
DB(|S(4,1)|)Directional Coupler EM Extract
DB(|S(4,1)|)EM_Extract_Doc
Then Simulate The Directional Coupler using EMSightFor Final EM Simulation
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Directional Coupler
Example 2:
Design a 20dB coupled line coupler in microstrip, characteristic impedance of 50 Ohm,and a center frequency of 3GHz. Plot the coupling and directivity from 1 to 5GHz.
Directional Coupler Schematic
MSUBEr=2.6H=0.504 mmT=0.018 mmRho=1Tand=0.002ErNom=2.6Name=SUB1
W
W
1
2
3
4
MCLINID=TL3W=1.341 mmS=0.651 mmL=17.12 mm
PORTP=1Z=50 Ohm
PORTP=2Z=50 Ohm
PORTP=3Z=50 Ohm
PORTP=4Z=50 Ohm
Directional Coupler Layout
Directional Coupler EM Structure
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Directional Coupler Simulation Response
1 2 3 4 5Frequency (GHz)
Graph 1
-80
-60
-40
-20
03 GHz-20.97 dB
DB(|S(1,1)|)Directional Coupler
DB(|S(1,1)|)Directional Coupler EM Extract
DB(|S(1,1)|)EM_Extract_Doc
DB(|S(2,1)|)Directional Coupler
DB(|S(2,1)|)Directional Coupler EM Extract
DB(|S(2,1)|)EM_Extract_Doc
DB(|S(3,1)|)Directional Coupler
DB(|S(3,1)|)Directional Coupler EM Extract
DB(|S(3,1)|)EM_Extract_Doc
DB(|S(4,1)|)Directional Coupler
DB(|S(4,1)|)Directional Coupler EM Extract
DB(|S(4,1)|)EM_Extract_Doc
Directional Coupler Hands on Example
Example 3:
Design a 10dB coupled line coupler in microstrip, characteristic impedance of 50 Ohm,and a center frequency of 12GHz. Plot the coupling and directivity from 10 to 14GHz.