Let’s take a look at substrate-integrated waveguide (SIW) implementations of the same bandpass filter we’ve examined in other implementations in Parts 1 and 2. SIW technology has been well-established as a technology1,3,4,5 over the last decade. It mimics the structure and performance of the metallic waveguide technology but with miniaturized dimensions. The miniaturization of the dimensions depends on the dielectric constant of the material in play.
In fact, SIW technology is a printed-circuit-board (PCB) technology with some advanced design rules, especially when implementing structures in the mmWave bands. In this article, we’ll examine the implementation of a SIW bandpass filter with H-plane iris and with metallic posts.