Soort opdracht: Stage-/Afstudeeropdracht
Studierichting(en): Elektrotechniek (Analoog, RF, telecommunicatie), Natuurkunde, etc.
Titel van de opdracht: Investigation of Ferrite-free Circulators-Isolators
The people we all rely on to make the world go round – they rely on Thales. In a world that is increasingly fast-moving, unpredictable and full of opportunities, they come to us with big ambitions: to make life better and to keep you safer. Combining a unique diversity of expertise, talents and cultures, our employees design and deliver extraordinary high-tech solutions. With 68.000 talents working in 54 countries, 2000 employees are based in the Netherlands. We are one of the biggest high-tech employers in the field of safety and security.
We help our customers think smarter and act faster in the fields of transportation, defence, space, aerospace and cyberspace, mastering ever-greater complexity and every decisive moment along the way. We are therefore leading the digital transformation, focusing on artificial intelligence, big-data & data analytics, connectivity, mobility and internet of things and cybersecurity.
In the Netherlands, we are located in four cities: Huizen, Delft, Eindhoven and Hengelo (HQ). Together with an extensive ecosystem of knowledge partners, customers and suppliers, we work on radars for naval vessels, cyber security solutions, transportation systems, communication equipment for land forces, cryogenic cooling solutions, research & development for radar tech (in collaboration with TU Delft) and research & development for serious gaming (in collaboration with the University of Twente).
Within the RF Engineering department radar front-ends are developed. This includes antennas, transmitters, signal generators and receivers. Besides product development, innovative technology studies are carried out in this field.
Circulators are a key RF device in radar front-ends. This 3-port device has unique properties to provide proper connection of the receiver and transmitter chain to and the antenna with a low-loss path in a circular propagation mode with high isolation in the counter propagating direction. Over the past 60 years the dominate technology for non-reciprocal has been based on ferrites. Which are passive high-resistivity ferromagnetic materials. Ferrite circulators suffer from major drawbacks inherent to the materials. They are bulky, heavy and difficult to design and integrate in compact front-ends. They are also sensitive to temperature and they behave worse at high frequencies from X-band. Some alternatives has been being recently introduced based on different approaches to achieve non-reciprocity without ferrites: such as spatio-temporal modulations or artificial materials. Most of this solution seems to be easily implementable in an integrated circuit or in the antenna.
About the assignment
Foreseen activities are:
- Literature search on magnetic-free circulator solutions,
- Compare various concepts for feasibility and losses, power handling capabilities.
- Build theoretical and analytical models to explain principle of operation (MATLAB, ADS, HFSS)
- Perform a preliminary design a of the selected solution, including passive and active structures
- Report the activities, design procedure and results in a detailed report.
Activities for this topic are a mixed of electromagnetic-antenna and microwave active circuit design. Good background on both EM and microwave circuits are desirable.
Analogue electronics, Electromagnetics, RF/Microwave electronics, High frequency, etc.
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