High linearity RF filter tunes over 3.4 to 11.1GHz

UofPenn Olsson rf filter

“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.

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