How to simulate the coupling coefficient of a hairpin filter to obtain its separation

Hi guys,

using microwave office or ads ,how do i simulate the coupling coefficient of a hairpin filter to obtain its separation.

Hello Danesh,

Coupling Coefficient using MWO

First plot the S21 Magnitude in dB & then find the two highest peaks in |S21|.
The frequency of the first peak (lower frequency) is called F_low.
The frequency of the second peak (high frequency) is called F_high.

Then use the output equation to calculate coupling coefficient
K =
(F_high^2-F_low^2)/(F_high^2+F_low^2)

This formula is from the Daniel G. Swanson Jr. article entitled
"Narrow-Band Microwave Filter Design. IEEE Microwave Magazine.
http://www.macom.com/TechApps/pdf/Na...esign10_07.pdf
See the extracted pictures?
Then finally sweep the spacing between the resonators (S) & plot the coupling coefficient vs Spacing on a graph?

---manju---