Hello all,im new here.
I was trying to do calculation for a high pass filter and i found online that they do basically this, they select butterworth values as: g1=1, g2=2 and g3=1, at this point, my impedance line is r0=50ohm, and the frequency cut off value i chose to be 800MHz (L5 band is at 1176MHz)

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   i was trying to do calculation and i found online that they do basically this, they select butterworth values as: g1=1, g2=2 and g3=1, at this point, my impedance line is r0=50ohm, and the frequency cut off value i chose to be 800MHz (L5 band is at 1176MHz) The calculations i did are these: C1=1/G1R02pif=3.98pF L2=R0/G22pi*f=4,97nH C2 same as C1, these values i found to be the same on a CLC filter calculator.
   I didnt stick to a book tho, should i look for an example from a book or maybe put the values in a simulation tool till i find the frequency response i need?
   
   The screenshot is taken from this IC: B39162B8389P810, which i selected as pass band for my GPS module, which works at L1/L5 frequencies.
   
   Thanks for all the help!
   
   

 

This is the screen