MTI
ISO 9001 Certified
.tr/~microwave/programs/magnetic/dcoupler/dcoupler.htm
Directional Coupler(4)
Step 3: To design the Length of parallel line Odd mode Wavelength Even mode Wavelength
Step 1: According to “Coupling Factor” to decide “Even mode Impedance” and “Odd mode Impedance”
Coupling factor decide by designer
c = 10
− C / 20
Odd mode Impedance
Homework exercise 2
Design Directional Coupler Design
Regarding to your sustaining product to design one directional coupler By paper or power point
Or Design Divider/ Quadrature (90º) Hybrid
3dB_耦合器设计入门
52-5120 Training Course
- Passive Component Design -Coupler/Power divider
Prepare by: Peter Huang Date: 07/21/2005
MTI
ISO 9001 Certified
Contents
Regarding to your sustaining product to design one divider or 90 hybrid By pape1 Certified
References
David M. Pozar, “Microwave Engineering” .tw/chu/e-medi@waves.htm .tr/~microwave/program s/magnetic/dcoupler/dcoupler.htm
MTI
ISO 9001 Certified
Office2000
Measuring Coupler Directivity
Pc C Load
Pc M= Pmax Pmax m= Pmin
Vi,Pi
Pmax, Pmin Sliding Load
Directivity : D
C/D
C
MTI
Vi,Pi
ISO 9001 Certified
λ0 λgo = ε eff ,o
the Length of parallel line
λ0 λge = ε eff ,e
1 ( λgo + λge ) l= × 4 2
Step 4: According to w, s, and l to simulation the directional coupler by Microwave
Z0
λ
4
Z0
2Z 0
MTI
ISO 9001 Certified
100 ohm
The Quadrature (90º) Hybrid
1
Z0
Z0 2
2
Z0
λ
4
RS E RS E I=2 DR I=1 DR R10Om R10Om =0 h =0 h
Z0
Z0 2
3
λ
4
MTI
ISO 9001 Certified
RF, RFIC & Microwave Theory, Design
MTI
ISO 9001 Certified
MTI
ISO 9001 Certified
Directional Coupler(1)
Input Through
Coupled
Isolated
MTI
ISO 9001 Certified
2
21
Directional Coupler(2)
Directional Coupler Design Step:
Directional Coupler Measuring Coupler Directivity Lenge Coupler Lenge Coupler example The Wilkinson Power Divider The Quadrature (90º) Hybrid Homework exercise 2
2m D = M( ) m +1
Lenge Coupler
MTI
ISO 9001 Certified
Lenge Coupler-example
MTI
ISO 9001 Certified
Lenge Coupler Simulation
MTI
ISO 9001 Certified
The Wilkinson Power Divider
Even mode Impedance
Z 0o = Z 0
MTI
ISO 9001 Certified
1− c 1+ c
Z 0e = Z 0
1+ c 1− c
Directional Coupler(3)
Step 2: According to “Even mode Impedance” and “Odd mode Impedance” to calculate the Wide and Gap width of Coupling line