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Item type:Publication, Access status: without files , Slow wave nonlinear multi-mode time dependent theory of coaxial cavity gyrotrons based on singular integral equation methodPublicationtype: Conference Paper21 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , 32 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Analysis and fabrication of a frequency-selective helix layerWe investigate a layer composed of periodically placed copper helices. Thereby, left- and right-turned helices form a chessboard-like pattern. In this manner, cross-polarized field components which are inherent to helical particles cancel out. According to theory, this setup features nearly full reflection at resonance. The single-scatterer resonance of a representative number of particles is examined experimentally in order to assess manufacturing tolerances. The latter are taken into account by a numerical scattering approach being able to determine reflection and transmission characteristics. For experimental verification, the scatterers are mounted in commercially available plastic foam. To reduce the effect of manufacturing tolerances, smallstructured profiles are cut out by means of a laser beam. A fabricated sample consisting of a total of 3600 helices is characterized by means of a free-space measurement setup.Publicationtype: Conference Paper47 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , High resolution FMCW radar system for investigating the polar ice capsPublicationtype: Conference Paper30 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Circularly polarized substrate-integrated waveguide antenna array at Ka-BandThis contribution deals with the design, implementation, and test of a circularly polarized 3×3 antenna array at 30 GHz. The array elements are realized as open-ended substrate-integrated waveguides [SIW]. Focus of this paper is on the polarizer of the single antenna and on the realization of the array. Simulation as well as measurement data is presented and discussed.Publicationtype: Conference Paper36 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Environmental evaluation of LTCC flip-chip and surface mount technology for satellite applications(VDE Verlag, 2008-10-01); ; ; ; An environmental qualification of a hybrid technology for satellite applications is presented. It is based on low temperature co-fired ceramic modules attached in a surface mount technology to a mother board on an aluminum base plate. For the module assembly flip-chip mounting using ultrasonic and thermocompression bonding is considered. As a validation the circuits are exposed to numerous mechanical and thermal testing procedures. In three qualification steps the different manufacturing methods are evaluated and discussed.Publicationtype: Journal Article58