Microwave filtering amplifiers
Filtering microwave amplifiers have become a topic of interest because of the need for devices capable of isolating the system itself and avoiding interference from other systems. Key subsystems in communication receivers and transmitters are the microwave amplifiers, either low-noise amplifiers (LN...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/356906 |
| Acceso en línea: | https://hdl.handle.net/2117/356906 |
| Access Level: | acceso abierto |
| Palabra clave: | Microwave amplifiers Microwave circuits Microwave transistors microwave circuits microwaves transistors circuitos de microondas transistores de microondas microwave amplifiers amplificadores de microondas Amplificadors de microones Circuits de microones Transistors de microones Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques |
| Sumario: | Filtering microwave amplifiers have become a topic of interest because of the need for devices capable of isolating the system itself and avoiding interference from other systems. Key subsystems in communication receivers and transmitters are the microwave amplifiers, either low-noise amplifiers (LNA) or solid-state power amplifiers (SSPA). Different topologies have been proposed in the last years and a big research effort has been devoted to filtering structures, either in the input matching network (IMN) or output matching network (OMN). The subject of study of this master thesis is the design of a filtering microwave amplifier to be operated at 4 GHz. As a continuation of my bachelor final project -where the subject of study was the design of a frequency-switchable microwave amplifier that could be operated at three different frequencies (3.2 GHz, 4 GHz and 4.8 GHz) in the 5G band- this master thesis proposes a methodology to improve the filtering capabilities of such components. To this end, several filtering structures are studied, taking into account the trade-off between performance and circuit size. The theoretical design procedure is studied, providing insights in the problems that can appear for different filtering topologies. The IMN is based on a simple line-stub structure, and the OMN is a filtering structure which is simulated and fabricated in multiple forms to provide insights in the structures available. The amplifier behavior is simulated using circuit and 2.5D electromagnetic simulations and optimized. The amplifier was fabricated on a conventional microwave substrate, and its S parameters and noise figure were measured and compared to simulations, showing a good agreement with simulations. |
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