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This thesis deals with the creation of a cross-platform application using Xamarin.Forms. The cross-platform application will cover three different platforms android, iOS, and UWP.
The application is the first concept of a possible feature for a companion application for LS telcom. There, the user can identify cell antennas using a map-view and a camera-view making the application an augmented reality application. Thus, the user can search for a specific cell and access various information that he would not be able to see with his eyes like for example the frequency of the transmitting cells.
The cell data is generated from three different sources, Cartoradio, OpenCelliD, and the LS telcom databrowser. Eventually, the decision was taken, that the main source should be the LS telcom databrowser which has multiple advantages over the other cell sources.
The cells on the map-view are placed using the extracted coordinates from the source data. However, the cells on the camera-view are placed with complex calculations using different formulas like the Haversine formula to calculate the distance between the cell and the user and the bearing to calculate the angle between the cell and the user. Various settings will allow the user to personalize the application according to his wishes.
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.
Der Entwurf von Strukturen zum reflexionsarmen Einbetten von Halbleiterbauteilen in Mikrostreifenleitungsschaltungen gestaltet sich mit steigender Frequenz kritischer. Deshalb wird ein Verfahren vorgestellt, das es ermöglicht, das Streuverhalten solcher Strukturen unter Anwendung der dreidimensionalen Finite-Differenzen-Methode auf die Maxwellschen Gleichungen numerisch zu berechnen. Hierauf aufbauend wurde das Programmpaket F3D entwickelt. Das Streuverhalten einer Verbindung zweier GaAs-Chips durch eine dielektrische Wand wird in Abhängigkeit von Geometrieparametern diskutiert. Außerdem werden Ersatzschaltbilder unterschiedlicher Komplexität für CAD-Anwendungen vorgestellt. Diese ermöglichen zudem eine rechenzeiteffektive Optimierung dieser Struktur, die somit Filteraufgaben übernehmen kann. Dies wird am Beispiel eines Tiefpasses gezeigt.
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.
MPC-Workshop Juli 2018
(2018)