How to design Branch Line Coupler
As seen in figures blow Branch Line
coupler has four ports. notice the impedance and length of each line.
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| Schematic of Branch line coupler |
S-parameter matrix of Branch Line
Coupler:
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| Branch line coupler S parameter Matrix |
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Result of Branch Line Coupler
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How to Design
1.
consider your own substrate board
2.
calculate the width and length of each line by CST
Line Impedance Calculator or calculate by yourself
3.
consider that the width and length of the quarter wavelength is not
exactly the ideal in the simulation, But the values of CST Line Calculator are a good approximation for the start of the simulation
4.
sweep these values to get the best results (width and length
of each line)
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| ADS Results |
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| CST Results |
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