>Broadcom will produce advanced radio frequency components — including FBAR filters

Thin-film bulk acoustic resonator

https://en.wikipedia.org/wiki/Thin-film_bulk_acoustic_resona...

>Trends to utilize RF spectrum more efficiently with higher frequencies than roughly 1.5–2.5 GHz and in some cases also simultaneously with increasing RF output power have supported FBAR technology to become one of the key enabling technologies in telecommunication realisations. FBAR technology complements and in some cases competes with surface acoustic wave (SAW) technology and FBAR resonators can replace crystals in crystal oscillators and crystal filters at frequencies more than 100 MHz.