New hybrid with Q-factor-pass-band microwave filter constructed with di-electric resonators and coupled with a thick-film microstrip line made in diamond substrates

Abstract In the miniaturization of microwave filters for MIC requirements di-electric resonators produced from materials with high permeability (e r ) and small loss (tgδ), occupy a special place. On the one hand, they can be used in wave-guide filters, thus contributing to a considerable diminishing of dimension of such a construction. On the other hand, because of their easy coupling with the electromagnetic field and their small dimensions, di-electric resonators can be used in MIC strip construction. The authors of the present work have constructed a miniature band-pass filter working in the S and C band. The construction of the di-electric resonators involved the use of a new type of di-electric material with high temperature stability. In coupling, strip constructions were produced by the use of thick-film technology and gold pastes manufactured by DuPont (USA). An interesting means of coupling the extreme resonators with the strip-line was employed. PolyTherm ET 100 CVD diamond substrates, cut of yttrium–iron garnet (YIG), were used. Examples of filter constructions and their frequency characteristics are given. The development potential of such a domain of hybrid diamond filters is discussed.