THMA18: Optimizing High-Rejection LTCC Filter Performance in Microstrip and Co-Planar Waveguide Implementations

Presentation Abstract
LTCC filters have traditionally delivered around 30 dB of stopband rejection. Mini-Circuits has innovated LTCC technology to produce filter designs with rejection up to 90 dB and beyond. These high-rejection designs require a launch from a stripline PCB to achieve their full rejection performance but may be adapted for other types of substrates. This presentation introduces an interposer board that allows universal adaptation of high-rejection LTCC filters for mounting onto microstrip and coplanar waveguide traces. Implementations on various substrates are presented and their performance compared with the stripline use case, demonstrating significant performance benefits compared to other filter technologies.