Meshtastic (LongFast) Interdigital Cavity Filter

DescriptionThis is an interdigital cavity filter designed specifically for the default LongFast channel for Meshtastic (906.875MHz). It is designed with a ~5MHz bandwidth. It is made using conductive copper foil tape (with conductive adhesive!) and a few other things. The 3-piece design makes construction easier.It gets -33dB rejection at 900MHz and 915MHz. Insertion loss is about -2.4dB which is a little high for a cavity filter, but keep in mind, this is 3D printed and made with copper tape. I&#39;ve added a parametric tuning rod model so you can easily generate whatever rod lengths you need.Extras Needed2in (or 50mm) Conductive Copper Foil Tape1in (or 25mm) Conductive Copper Foil TapeM4 Brass Hex NutsM4 x 16mm Brass Machine ScrewsFemale SMA Panel Mount Connector<a target="_blank" rel="noopener noreferrer ugc" href="https://www.amazon.com/Copper-Crafts-Jewelry-Electroculture-Gardening/dp/B0C6GMJDK1/ref=sr_1_7?dib=eyJ2IjoiMSJ9.YDP4UR9vVetmWTCuYgGdPt7g9C2yp6JAFvt6hc41pncdIGWbnbTFqWY0ER