neazoi
Advanced Member level 6
Hi, I have noticed that high L/C ratios in a series LC can make a usable BPF in a single stage (pole) which can be converted to all bands by tuning the C and a few taps on the L.
Here is a simulation at 40m.
I only use 3 inductor values and a small 6-50pF trimmer to cover the whole HF.
The 100pFs are there just to improve the response on higher bands and have no effect on lower.
Components values are practical and the passband attenuation is very low, whereas the stopband can be very high at low C values.
I have also played around with the I/O impedances and the shape does not change too much, but most importantly the passband peak frequency does not change too much.
Can it really be that simple?
Here is a simulation at 40m.
I only use 3 inductor values and a small 6-50pF trimmer to cover the whole HF.
The 100pFs are there just to improve the response on higher bands and have no effect on lower.
Components values are practical and the passband attenuation is very low, whereas the stopband can be very high at low C values.
I have also played around with the I/O impedances and the shape does not change too much, but most importantly the passband peak frequency does not change too much.
Can it really be that simple?