Suspended Substrate Stripline Filters Integrated into a Mixed Analog-Digital and Radio-Frequency Stack

Traditional microwave circuits that make use of high performance suspended substrate stripline (SSS) filters require great care to be taken to ensure that a low loss transition between transmission lines and the filters is achieved. This poses both a manufacturing and tuning challenge. Here we present a design that combats this issue by integrating multiple SSS filters into the same printed circuit board (PCB) as the rest of the radio frequency (RF) system.