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Evaluations of powder bed fusion for microwave applications

Batson, Robert 2023. Evaluations of powder bed fusion for microwave applications. PhD Thesis, Cardiff University.
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Additive Manufacturing (AM) of metals is of interest to passive microwave applications as it introduces new design techniques for microwave components. However, with AM metals there are numerous issues and unknown variables. This thesis aims to address some of these variables, with the use of a novel broadband microwave technique for the characterisation of AM parts. This thesis presents three proposed methods used to investigate the performance via surface resistance, to gain a better understanding of the performance of Powder Bed Fusion (PBF). The chosen method is based on a broadband resonator (in the range of 2.8 - 8.9GHz) and is a novel measurement technique specifically used to characterise surface resistance over a range of frequencies, and uses additional isotropic magnetic field to investigate the microwave properties of PBF when applied at different angles. Experimental studies are performed to investigate the effects of build orientation of samples produced via PBF to evaluate their surface resistance for use for microwave applications. Finally, post-processing techniques have been studied to evaluate their effectiveness for microwave applications over a broad range of frequencies, with comparisons made to both their as-built counterparts as well as bulk material fabricated parts using subtractive methods of manufacturing.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Uncontrolled Keywords: 1) Microwave Measurements 2) Microwave Surface Resistance 3) Material characterisation 4) Metal Additive manufacturing 5) Broadband measurement 6) Coaxial Resonator
Date of First Compliant Deposit: 13 June 2024
Last Modified: 13 Jun 2024 16:07

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