“What’s special about YIG is that it propagates a magnetic spin wave,” said research engineer Troy Olsson.
The team is researching filters for 6G communication in ‘frequency range 3’ – FR3, 7 to 24GHz. “At these higher frequencies, you may not always have a dedicated block of spectrum just for commercial use,” said Olsson, who is proposing tuneable filters as an alternative to switching across a bank of fixed filters.
Architecturally the device is a magneto-static wave filter, formed as a cavity micromachined from thin-film YIG, grown on a gadolinium gallium garnet substrate. Injection and output transducers are aluminium.
