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A substrate integrated waveguide (SIW) cavity directly coupled to a planar circuit, i.e. microstrip line or coplanar waveguide, is presented. Different coupling topologies and coupling probes are discussed. Empirical equations to predict the resonance frequencies of the cavity are provided. A temperature stability and tolerance analysis of the cavity is also discussed. A number of prototypes of cavities with different coupling topology were fabricated and measured. Finally, as an example ofpotential applications, a filter using two SIW cavities was designed and measured.

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