Analysis of impedance-loaded passive SAW sensor

Genji, Takuma; Kondoh, Jun

doi:10.1109/fcs.2014.6859888

Cited by 1 publication

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the boundary condition can be obtained and substituted into P-matrix (2) and (4). The total reflection coefficient P 11t of the reflective grating connecting the external sensing element can be determined as follows [11,12]:…”

Section: Com Analysis For Saw Sensorsmentioning

confidence: 99%

“…Therefore, the boundary condition can be obtained and substituted into P ‐matrix (2) and (4). The total reflection coefficient P 11t of the reflective grating connecting the external sensing element can be determined as follows [11, 12]:

P_{11 t} = P_{11}^{normalSC} + \frac{2 P_{r 13}^{2}}{P_{r 33} + 1 / ()(, Z_{normalload} + Z_{normalmatch})}

where P r13 is the transfer function between the electrical port and the acoustic port. P r33 and P 11 sc are the input admittance and the reflection coefficient of the short‐circuit reflective grating.…”

Section: Com Analysis For Saw Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and test of a wireless impedance‐loaded SAW sensor

Xing¹,

Xie²,

Wang³

2019

Micro & Nano Letters

View full text Add to dashboard Cite

Instead of a conventional wireless transceiver system that requires batteries and complex circuits, the surface acoustic wave (SAW) sensor enables wireless passive measurement. A sensor consisting of an SAW device and external impedance sensing element is analysed. Since the reflection coefficient of the reflective grating on the SAW device depends on the load impedance, the echo characteristics are influenced by the change in the impedance of external sensing element. A resistance sensor or a capacitive sensor is selected as the external sensing element. The two different types of sensors are simulated using coupling-of-mode (COM) modelling, and the relationships between amplitude and phase with load impedance are analysed. On the basis of COM theory, a wireless impedance-loaded SAW sensor is fabricated by the lift-off process and tested by a network analyser to verify the simulation results. It is observed that the test results agree well with the simulation results. The phase change is more sensitive than the amplitude based on the results obtained. The sensitivity is 0.274°/Ω for the sensor with resistance and the sensitivity of the sensor with capacitance is 1.096°/pF. These results can guide the design of the high sensitivity impedance-loaded SAW sensors in the future.

show abstract

Section: Com Analysis For Saw Sensorsmentioning

confidence: 99%