This paper presents an overview of recent advances in substrate integrated waveguide (SIW) technology, with particular emphasis on different topologies and applications of SIW cavity resonators. While cavity resonators are the basic element of several RF and microwave components, SIW cavities can be implemented in a variety of ways, to optimize a given performance. This work outlines miniaturized cavities aiming at the footprint reduction, partially air-filled cavities for the implementation of SIW filters with additional transmission zeros, SIW cavities used as resonant coupling elements in the design of filters, and finally SIW cavities adopted for sensing purposes. For all these structures, a brief description of the operation principle is provided, along with the experimental verification.
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