Internship colloquium by Niels-Kristian Kjøller – Niels Bohr Institute - University of Copenhagen

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Internship colloquium by Niels-Kristian Kjøller

Multipaction in a Microwave Cavity Diplexer 

Today, most of the communication satellites used for telephone and television transmissions operates in the microwave range from a few GHz up to around 30 GHz. To do signal processing of microwave signals, hollow waveguiding metal structures are used.

When subjected to high power and the harshness of space, several undesired effects can occur in these hollow waveguides and cavities. One is known as the multipactor effect, and generates noise, alters electrical impedance, heats up the structure and may even cause hardware damage. It is thus highly desirable to avoid such effects when designing waveguide and cavity structures.

In 2010 I left Copenhagen for Madrid, where did a half year internship at the satellite manufacturing company Thales Alenia Space España. The aim of my project was to understand the multipactor effect, to program a model able to predict multipaction in geometrically complex hollow structures and to help design a so-called microwave cavity diplexer.

I have designed a multipaction simulation tool that can be used for any hollow structure and the tool has been successfully used to investigate two different designs of a microwave cavity diplexer. In my presentation I will introduce the concept of multipaction, describe the simulation model and present the simulation results for the two designs investigated.

Note: The presentation will be in danish.