High-power filters with novel temperature-compensation techniques and multi-domain topological co-design

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In an increasingly connected world, satellite technology is crucial. The cost of the launch of these satellites into space is directly linked to their weight, so it is necessary to reduce the weight of each component as much as possible. This is especially important to consider when designing microwave filters, which are used to separate incoming signals into different frequencies. As each satellite contains many filters, reducing their weight can have a large impact. Currently, bulky and heavy support structures are needed to prevent thermal expansion and frequency drift of these filters due to fluctuating temperatures in space. Conventional machining is used in their manufacture. However, this project proposes the use of additive manufacturing for the manufacture of both the filter and thermal expansion compensation mechanism. This would allow the filter to be made in a net shape capacity, with reduced requirement for post-processing and extra machining. The temperature compensation mechanism being investigated is the use of a structure with auxetic properties being built within the resonant cavity of the filter. These materials expand in the direction perpendicular to the force when pulled, rather than shrinking, meaning that they can provide tailorable properties and topology. Due to their lattice structure, they are also considerably lighter than the current support structures used in satellites today. Simulation and testing will need to be completed within several domains in order to complete this project. Topological design of the auxetic structure is important, as well as understanding the mechanical, thermal and electromagnetic behaviour of the filter.