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Structures for interconnecting active microwave semiconductor-devices, e.g. FET's and MIC's, with the electrical surrounding or with each other have to be designed more and more carefully when increasing the desired upper frequency limit. Therefore, several connecting structures for device embedding have been examined. Mainly, their applicability for the frequency range from 10 GHz to 100 GHz was considered. Additionally, different equivalent circuits were developed to approximately describe their behaviour for CAD-applications.
Die Wichtigkeit des Faches FEM ist sicher unumstritten. Um in der gegebenen Zeit eine ausreichende Einarbeitung in die Methode und die Uebung am Rechner durchfuehren zu koennen, ist der Einsatz eines auf PC lauffaehigen FE-Lernprogramms eine gute Hilfe. Sind die Grundlagen da, weiss der Student, welche Eingaben bei einem FE-Programm zu machen sind. Fuer manche Fachgebiete genuegt schon die Arbeit mit einem solchen Programm. Sind entsprechende Uebungen mit dem Lernprogramm erfolgt, kann auf professionellen Programmen wie z.B. CAEDS das Zusammenspiel CAD/FEM ernsthaft betrieben werden. Es sollte ein Fachsemester ausgesucht werden, in dem CAD und FE angeboten wird. Dieses Fachsemester sollte, um den Nutzen der FEM in moeglichst vielen Fachgebieten zu haben, zum Ende des Grundstudiums, spaetestens aber zu Beginn des Hauptstudiums liegen.
The advantages of the coupling-of-modes (COM) formalism and the transmission-matrix approach are combined to create exact and computationally efficient analysis and synthesis CAD tools for the design of SAW-resonator filters. The models for the filter components, especially gratings, interdigital transducers (IDTs). and multistrip couplers (MSCs), are based on the COM approach, which delivers closed-form expressions. In order to determine the relevant COM parameters, the integrated COM differential equations are compared with analytically derived expressions from the transmission-matrix approach. The most important second-order effects such as energy storage, propagation loss and mechanical and electrical loading are fully taken into account. As an example, the authors investigate a two-pole, acoustically coupled resonator filter at 914.5 MHz on AT quartz. Excellent agreement between theory and measurement is found.
An investigation is underway regarding the usefulness of altazimuth-mounting telescopes' incorporation of laser gyros for pointing and fiber gyros with extremely small random-walk coefficient for telescope inertial stabilization during tracking. A star tracker is expected to help stabilize long-term gyro bias. Gyro and telescope specifications have been derived by means of computer simulations and systems analyses.
Bei thermischen Konvektionsströmungen ist der Einfluß von Geometrie und Randbedingungen für die Strömungsform und den konvektiven Wärmetransport von wesentlicher Bedeutung. Mit Hilfe der optischen Strömungsmeßtechnik (Differentialinterferometrie) wurde die freie Konvektion in einem quaderförmigen Behälter mit seitlicher Beheizung untersucht. Der Aufbau und die Experimente werden beschrieben. Die quantitative Auswertung von Dichte- und Temperaturfeldern aus den Differentialinterferogrammen wird aufgezeigt und der Einfluß unterschiedlicher Randbedingungen wie feste und freie Oberfläche auf die Strömungsform und den Wärmetransport dargelegt. Die eingesetzte Differentialinterferometrie zeigt aufgrund ihrer Anpassungsfähigkeit an die jeweiligen Versuchsbedingungen und durch den einfachen Aufbau spezifische Vorteile gegenüber dem Mach-Zehnder Interferometer.
Bei einem neuen Kühldeckensystem wird die Luft im Deckenhohlraum oberhalb der abgehängten Decke durch Konvektoren gekühlt, wobei die Wärmeübertragung ausschließlich durch freie Konvektion und Strahlung erfolgt. Die abgehängte Decke nimmt durch Strahlung und freie Konvektion Wärme aus dem darunterliegenden Büroraum auf und gibt sie über freie Konvektion an die Luft im Deckenhohlraum sowie durch Strahlung an die Begrenzungsflächen des Deckenhohlraumes ab. Die vom Kühlwasser durchströmten Rippenrohre nehmen ihrerseits Wärme aus der Luft im Hohlraum auf, die infolge der freien Konvektion durch die Rippenrohre strömt. Zur Aufnahme des bei starker Belastung und Dauerbetrieb anfallenden Kondensats ist unterhalb des Konvektors eine Kondensatauffangwanne angebracht. Mit dem von Rutsch erstellten Rechenprogramm ist es möglich, für verschiedenste Randbedingungen die Rippenrohre auf maximale Kühlleistung zu optimieren. Voraussetzung für die direkte Anwendung dieses Berechnungsverfahrens sind jedoch ungestörte An- und Abströmbedingungen der Luft am Konvektor. Neben der Optimierung der Rippenrohre auf Kühlleistung ist für den Aufbau der eigentlichen Decke die Luftströmung im Deckenhohlraum und die Austrittstemperatur aus den Konvektoren von entscheidender Bedeutung. Die maximale Kühlleistung der Rippenrohre kann nur erreicht werden, wenn alle Einzelrippenrohre nahezu gleichmäßig durchströmt werden und günstige Abströmverhältnisse vorhanden sind. Die Strömungsverhältnisse im Deckenhohlraum und innerhalb der Konvektoren wurden durch Rauch sichtbar gemacht und auf Video aufgezeichnet. Entscheidenden Einfluß auf die Temperaturverteilung an der Kühldecke haben die Breite des Konvektors, die Konstruktion der Kondensatauffangwanne, der Abstand der Konvektoren voneinander und der Konvektortyp. Direkt unterhalb der Kondensatauffangwanne beträgt die Temperaturdifferenz ca. 3 K. Der Temperaturgradient im Abströmbereich liegt bei ca. 0,2 bis 0,3 K/m.
A polarization mode dispersion measurement set-up based on a Mach-Zehnder Interferometer was realized. Measurements were carried out on short high-birefringent fibers and on long standard telecommunication single-mode fibers. In order to ensure high accurate results, special emphasis was placed on the evaluation of the interference pattern. The procedure will be described in detail and practical measurement results will be presented.