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Butterworth Band Pass Filter

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danesh

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butterworth bandpass filter

Hi Guys

Im trying to calculate the width and separation for hairpin filter arm as published by an author, in the attached paper. I couldnt get the width values as claimed by the author. I have calculated these values using ADS line cal calculator. The author designed the hairpin filter band pass filter base on this spec:

Butterworth configuration
FBW=10%
Center freq=900MHz
Er=3.38
H=1.52
effc. Dielectric= 3.43

Base on butterworth prototype table :

go 1
g1 0.618
g2 1.618
g3 2
g4 1.618
g5 0.618
g6 1

Even (Ohm) Odd (Ohm)
Z10 87.91983435 37.50087762
Z21 59.0894128 43.37881579
Z32 54.74792646 46.01475617

my excel calculation of its odd and even impedance which doesnt tally with the width resonator arm calculated using ADS line CAL shown in this paper.

Thanks for kind Reply

-danesh-
 

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