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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.
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.
Die hochfrequente, feldnumerische Analyse mit der Finite-Differenzen Methode erfordert die Diskretisierung der zu untersuchenden Struktur in einem nichtäquidistanten Gitter. Vorschriften zur Diskretisierung kreiszylindrischer Strukturen wie sie z.B. bei Durchkontaktierungen auftreten, werden untersucht und eine optimierte Lösung vorgestellt.
Virtual-Reality-Darstellung elektromagnetischer Felder in dreidimensionalen Mikrowellenstrukturen
(2000)
Untersuchungen haben gezeigt, daß der Mensch ein Vielfaches an Informationen in Form von visuellen Eindrücken, im Gegensatz zur textuellen Darstellung, verarbeiten kann. Mit Hilfe des numerischen Feld-Simulationsprogramms F3D können Mikrowellenstrukturen auf die Wechselwirkung mit elektromagnetischen Feldern untersucht werden. Das Programm F3D2VRML stellt die Ergebnisse in einer dreidimensionalen Virtual-Reality-Darstellung (VR) dar.
Damit ist es dem Betrachter möglich, mehr Informationen aufzunehmen, da die Informationen mit Formen und Farben im dreidimensionalen Raum visualisiert werden.
iSign - internet based simulation of guided wave propagation - ist eine Lernumgebung für Online-Laborversuche. Die Client-Serverarchitektur nutzt server-seitig das Tool F3D, das elektromagnetische Felder in 3D-Strukturen berechnet. Ein Apache-Webserver (unter Linux) bedient den Theorie-/Aufgaben-Teil und die Lernsystemadministration. Ein HPUX Simulationsserver steuert und kontrolliert den mehrstufigen Simulationsvorgang. Eine MySQL-Datenbank erlaubt dynmaische Webseiten-Generierung und Simulations-, Projekt- und Userdatenhaltung. Java-Applets, JavaServer Pages und JavaBeans erzeugen die interaktive Client-Oberfläche zur Eingabe, Ergebnisdarstellung und für Online-Virtual Reality. Die einheitlich gestaltete Benutzeroberfläche verbirgt die Systemkomplexität.
Nowadays the processing power of mobile phones, smartphones and PDAs is increasing as well as the transmission bandwidth. Nevertheless there is still the need to reduce the content and the need of processing the data. We discuss the proposals and solutions for dynamic reduction of the transmitted content. For that, device specific properties are taken into account, as much as for the aim to reduce the need of processing power at the client side to be able to display the 3D (virtual reality) data. Therefore, well known technologies, e.g. data compression are combined with new developed ideas to reach the goal of adaptive content transmission. To achieve a device dependant reduction of processing power the data have to be preprocessed at the server side or the server even has to take over functionality of weak mobile devices.