Mini-Circuits’ BFHK-1942+ is a high-performance bandpass filter designed for the SATCOM Ka-Band downlink, covering 17.7 to 21.2 GHz with exceptionally low insertion loss and high out-of-band rejection. This filter was designed with an advanced substrate integrated waveguide (SIW) topology to deliver waveguide-class selectivity and rejection in a compact, SMT LTCC package. This approach combines the low loss and high-Q performance of waveguide structures with the scalability and manufacturability of standard SMT components.