Parametric Acoustic-based Passive Transponders for Ultra-sensitive Temperature and Temperature-Threshold Sensing

Frequency Domain Acoustic-Based Subharmonic Tags for Far-Field Identification

“…Nevertheless, as experimentally demonstrated in [41], such a strict resolution can be achieved by relying on bulk acoustic wave (BAW) resonators exploiting quasi thickness-extensional (TE) modes of vibration [42], like the Two-Dimensional-Mode-Resonators (2DMRs [41], [43], [44] ) or the Two-Dimensional-Resonant-Rods (2DRRs [45]) demonstrated by our group. In fact, even though these devices are not usable to build delay elements for TDR-based PTs due to their modal characteristics inhibiting the lateral propagation (8) f8 f16 fa (16) f24 f25 fa (24) C2 L2…”

“…Output Antenna f9 fa (8) f8 f16 fa (16) f24 f25 fa (24) Z out (a) (9) fa (8) fa (32) fa (16) fa (17) fa (24) fa (25) fa (1) Z out (3) fa (1) fa (2) fa (32) fa (4) Z out (c) b) and (c), respectively. Also, the simulated P out vs. f out trends relative to the SubHTs in (a), (b) and (c) and for f out values equal to half of the chirp interrogation signal's frequency (varying from 800 MHz to 816 MHz with 500 kHz steps) is also shown.…”

“…For instance, several RF circulators [15]- [17], filters [18], [19] and isolators [20] have been developed, based on the unique dynamics triggered by the periodic modulation or switching of solid state capacitors. Just recently, our group has exploited similar dynamics to generate a new class of PTs dubbed as Subharmonic Tags (SubHTs [21]- [24] ). Sub-HTs permit to passively sense any parameter-of-interest (PoI) with dynamically boosted sensitivity and dynamic ranges.…”