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Compact dielectric inserts, overlapping a waveguide cross-section completely or partially, received the name waveguide-dielectric resonators (WDR) and are widely used in microwave technique as filter resonant sections, sealed windows for vacuum tubes, terminal loads, and so on. The subject of studying in the given work is WDRs based on sections of partially filled rectangular waveguides in which a dielectric plate completely overlaps a waveguide cross-section through the height (Fig. 1). Results of calculations of both spectral and scattering characteristics with taking into account the dielectric loss as well as the comparison of the theoretical and measured data are presented in the work.