A K-Band Bulk Acoustic Wave Resonator Using Periodically Poled Al_0.72Sc_0.28N

Frequency tunable magnetostatic wave filters with zero static power magnetic biasing circuitry

“…This is especially problematic as frequencies are scaled beyond the spectrum allocated for 5 G (3)(4)(5)(6), where RF silicon-on-insulator switches exhibit unacceptably high loss when utilized in switched filter banks 4,5 . For example, the FR3 band from 7.125 to 24.25 GHz under exploration for 6 G networks will require extensive innovations in both RF switch 4,6 and acoustic filter [7][8][9][10] technologies if it is to adopt the massively parallel switched acoustic filter banks utilized in 4 G and 5 G networks. As compared to the traditional implementation of a switched filter-bank, a single tunable filter has great potential to reduce the system cost, size, complexity, and remove entirely the additional switch paths loss 2,[11][12][13] .…”