Directional Coupler using MWO.pdf

8/18/2019 Directional Coupler using MWO.pdf

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Directional Coupler Basics


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Directional Coupler Basics


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Directional Coupler


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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.


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1. Create New Schematic Shown Below


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2. Go to Elements Tab

3. Select Microstrips

Lines

Coupled LinesJunctions


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Complete Directional Coupler Schematic

MSUBEr=2.6

H=0.504 mmT=0.018 mmRho=1Tand=0.002ErNom=2.6Name=SUB1

MLIN

ID=TL1W=1.37 mmL=5 mm

W

W

1

2

3

4

MCLINID=TL3

W=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


MSTEP$

ID=TL8


MBENDID=TL10W=1.37 mm

ANG=90 DegM=0.6

MBENDID=TL11W=1.37 mm ANG=90 Deg

M=0.6

PORTP=1Z=50 Ohm

PORTP=2Z=50 Ohm

PORTP=3Z=50 Ohm

PORTP=4Z=50 Ohm

Add MSUB Substrate blo


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View the complete Layout of

Directional Coupler Layout


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Add Graph


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Right click & select add Measurement

Then Choose S11, then Apply, S21 etc


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Directional Coupler Simulation Response

Simulate the design for 5 to 13 GHz in steps of 0.1

5 7 9 11 13

Frequency (GHz)

Graph 1

-50

-40

-30

-20

-10

0

DB(|S(1,1)|)Directional Coupler

DB(|S(1,1)|)Directional Coupler EM Extract

DB(|S(1,1)|)EM_Extract_Doc







DB(|S(4,1)|)

Directional Coupler DB(|S(4,1)|)Directional Coupler EM Extract



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Then Simulate

The Directional Coupler using EMSight

For Final EM Simulation

1

2

3

4


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Directional Coupler

Example 2:



frequency of 3GHz. Plot the coupling and

directivity from 1 to 5GHz.


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Directional Coupler Schematic

MSUB

Er=2.6

H=0.504 mm

T=0.018 mm

Rho=1

Tand=0.002

ErNom=2.6

Name=SUB1

W

W

1

2

3

4

MCLIN

ID=TL3

W=1.341 mm

S=0.651 mm

L=17.12 mm

PORT

P=1

Z=50 Ohm

PORT

P=2

Z=50 Ohm

PORT

P=3

Z=50 Ohm

PORT

P=4

Z=50 Ohm


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Directional Coupler Layout


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Directional Coupler EM Structure

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2

3

4


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Directional Coupler Simulation Response

1 2 3 4 5

Frequency (GHz)

Graph 1

-80

-60

-40

-20

0

3 GHz-20.97 dB














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Directional Coupler Hands on Example

Example 3:



frequency of 12GHz. Plot the coupling anddirectivity from 10 to 14GHz.


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Directional Coupler Hands on Example 4

The voltage coupling factor C = 10 pow(-20/20) =0.1

Z0e=Z0sqrt(1+C/1-C) = 55.28 ohm

Z0o=Z0sqrt(1-C/1+C) = 45.23 ohm

Sqrt(Er) Z0e= 82.0

Sqrt(Er) Z0o= 67.1

W/b = 0.809 & S/b = 0.306

W = 0.259cm

S = 0.098cm

Directional Coupler using MWO.pdf

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