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Biography

Biography: Alexander G. Yushchenko

Abstract

Bandpass filters in send/receive systems, protect the receivers from spurious emissions, split broadband signals to separate channels for better handling, stabilize local oscillator frequencies, etc. Among the known filter designs, the original filters based on partially-filled WDRs are distinguished for their high quality and sparse spectrum of spurious modes; they can be a basis for creation of ultra-wideband, millimeter and sub-millimeter devices. Being constructed with superconducting materials in combination with quartz and leucosapphire, they have no competitors in terms of overall quality indices. We show that the advantage of WDR filters consist in selective properties and discuss the ways of their adaptation to planar technologies. It was demonstrated that electrodynamic properties of WDR filters allow creating devices ranging from narrow to ultra wide passbands. But development of high quality filters largely depends on how much the CAD systems are able to optimize the filter construction basing on such criteria as steepness of the frequency response curve, out-of-band suppression value and maximum achievable bandwidth. Since the known CAD systems lack such functions, we propose an original knowledge-based CAD program implementing the strict electrodynamic models of coupled resonators obtained using generalized scattering matrix method.