50 GHz Piezoelectric Acoustic Filter
Year: 2026
Type: article
Abstract: This paper presents significant frequency scaling of acoustic filter technology to 50 GHz. This achievement is enabled by the periodically poled piezoelectric film LiNbO3multilayer stack, in which piezoelectric thin-films of alternating orientations are transferred in sequence, thereby allowing efficient exploitation of high-order modes with high quality factor and coupling coefficient in a thicker piezoelectric stack. The demonstrated filter is comprised of twelfth-order symmetric mode lateral-field-excited bulk acoustic wave resonators (XBARs), built on a 4-layer periodically poled piezoelectric 128° Y-cut lithium niobate (LiNbO3) stack. The filter exhibits 3.3 dB insertion loss and a fractional bandwidth of 2.9% . The miniature design, with a footprint of 0.36 mm2, makes it promising for future wireless front-end applications. These results represent the highest frequency acoustic filters reported to date, setting a new benchmark in piezoelectric filter technology. Upon further development, the platform could enable filters further into the FR2 range, essential for next-generation communication systems.
Source: IEEE Journal of Microwaves
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,075
OpenAlex ID: W4416501729