Sunday, March 05, 2023

Interdigital Bandpass Filter for 1.2Ghz / 23cm

 Part of a project on 1.2Ghz that will include this band-pass filter.

Main dimensions got online via the tool here:

Some details of similar construction for different frequency range (ADS-B) here:


My construction:


Used FR4 double sided PCB for the sides and brass for elements, bottom and top


Online results example for dimensions:

 And the outcome:


Regarding results; not the best optimization for attenuation but not bad either considering the dimensions and construction not to the greatest dimensional andards:

Have a nice day!