How to design Branch Line Coupler


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.
Schematic of Branch line coupler

S-parameter matrix of Branch Line Coupler:
Branch line coupler S parameter Matrix

Result of Branch Line Coupler


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)


ADS Results

CST Results
CST Results
CST Results



Video Tutorial: https://youtu.be/UW2Z1UWdl-c

Ramian19@gmail.com

Hossein Rajabloo

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