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plz help in combline filter design

Question asked by sandeepsreeman on May 31, 2010
hi friends i have combline bandpass filter from frequency range 0.5ghz to 3 question i have to ask is
1)what is the impedance of the resonator we have to take when designing the combline filter using tap input and output?? in my case i have taken 95ohm impedance resonator.....i have taken previously 60,70,75,80 ohm but by 95 ohm impedance it is satisfying my requirements of 60dB attenuation in the stop band at 60MHZ away from centre frequency??? what is the natural choice of resonator impedance is there any limit is there to take resonator impedance