Bandpass filter with minimum number of inductors (help)

hi

I am looking for a bandpass filter structure with minimum number of inductors
this filter should have a FBW= 50 %

any paper or reference pls

the number of inductors needed is dependent upon the falloff and atteneuation needed. For a wide band width filter it is a good idea to overlap a lowpass and high pass, this scheme is uncomplicated and works well.

You can use 2nd order Butterworth band pass filter, by this way you can avoid using coils at all.

If you want schematics please tell me.

sure i want the sharpest falloff but the most important thing is that this filter shouldn't use a lot of inductors

I have found that inverse chebyschev filter gives the sharpest falloff (really elleptic is better) with liner phase shift

i would be grateful if u can give me some schematics

what about coupled resoantor filters does anyone have info about how to make one

tanx

Hi

Try using filtersolution, which provide an option to design filters with minimum inductor count.

Regards

maybe i didnt make my self clear

this filter has a center frequency of 4 GHz

Alright, 50% is very large if you are talking 4 GHz, as I suggeested before
your best bet is to overlap a high and low pass, the number inductors will be
based on the requirements i can give you an estimate if you specify IL, RL, and Atten


if the BW was not so high a cheby would be a good filter, as for coupling, inductive coupling can give you a tighter response but at 50% of 4 GHz this is not what your problems are

you could get a decent little response with probably 4 inductors, maybe less