TY - JOUR
T1 - Scattering matrix approach to design of one-port surface acoustic wave resonator sensors utilizing reflectors as sensing element
AU - Kesuma, Howgen Pratama
AU - Ramakrishnan, N.
AU - Lan, Boon Leong
AU - Dhillon, Amardeep Singh
AU - Achath Mohanan, Ajay
N1 - Funding Information:
Manuscript received July 5, 2020; accepted October 12, 2020. Date of publication October 16, 2020; date of current version March 26, 2021. The work of Ajay Achath Mohanan was supported by the Ministry of Higher Education Malaysia’s FRGS grant FRGS/1/2018/STG02/MUSM/03/2. (Corresponding author: Ajay Achath Mohanan.) Howgen Pratama Kesuma, N. Ramakrishnan, and Amardeep Singh Dhillon are with the Department of Electrical and Computer Systems Engineering, School of Engineering, Monash University Malaysia, Bandar Sunway 47500, Malaysia (e-mail: howgen.kesuma@monash.edu; ramakrishnan@monash.edu; amardeep.sogurdirsingh@monash.edu).
Publisher Copyright:
© 1986-2012 IEEE.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/4
Y1 - 2021/4
N2 - It has been recently demonstrated that one-port surface acoustic wave (SAW) resonators known for their high ${Q}$ value and relatively small device footprint could be utilized for in-liquid mass loading sensing applications where only the reflectors of the device are coated with the sensing film, while the interdigital transducer (IDT) is isolated from the sensing environment. The sensor relies on changes induced in reflectivity and phase velocity of SAW in the region of the reflectors upon detection of the measurand and is particularly advantageous for SAW resonator-Type sensors as any contact of the sensing film with the IDT could change its static capacitance during sensing and thereby introduce serious instability in the sensor response. Accordingly, in the present work, the existing scattering matrix approach to the design of one-port SAW resonator filters, which does not cater to the integration of sensing film on the resonator surface, is adapted to develop a method to design one-port SAW resonator sensors utilizing reflectors as sensing element. The reflector block of the one-port SAW resonator is readily split into sensing-Active and sensing-inactive parts using the SAW grating transmission matrix in order to study the changes introduced in input admittance of the device for varying level of coverage of the sensing film. The theoretical design approach presented in this work could be used to fabricate high-performance one-port SAW resonator sensors operating at its point of highest sensitivity while utilizing one of the device reflectors as sensing element, without the use of additional impedance matching circuit elements.
AB - It has been recently demonstrated that one-port surface acoustic wave (SAW) resonators known for their high ${Q}$ value and relatively small device footprint could be utilized for in-liquid mass loading sensing applications where only the reflectors of the device are coated with the sensing film, while the interdigital transducer (IDT) is isolated from the sensing environment. The sensor relies on changes induced in reflectivity and phase velocity of SAW in the region of the reflectors upon detection of the measurand and is particularly advantageous for SAW resonator-Type sensors as any contact of the sensing film with the IDT could change its static capacitance during sensing and thereby introduce serious instability in the sensor response. Accordingly, in the present work, the existing scattering matrix approach to the design of one-port SAW resonator filters, which does not cater to the integration of sensing film on the resonator surface, is adapted to develop a method to design one-port SAW resonator sensors utilizing reflectors as sensing element. The reflector block of the one-port SAW resonator is readily split into sensing-Active and sensing-inactive parts using the SAW grating transmission matrix in order to study the changes introduced in input admittance of the device for varying level of coverage of the sensing film. The theoretical design approach presented in this work could be used to fabricate high-performance one-port SAW resonator sensors operating at its point of highest sensitivity while utilizing one of the device reflectors as sensing element, without the use of additional impedance matching circuit elements.
KW - One-port surface acoustic wave (SAW) resonator
KW - SAW grating transmission matrix
KW - SAW sensor
KW - scattering matrix approach
UR - http://www.scopus.com/inward/record.url?scp=85103422923&partnerID=8YFLogxK
U2 - 10.1109/TUFFC.2020.3031583
DO - 10.1109/TUFFC.2020.3031583
M3 - Article
C2 - 33064646
AN - SCOPUS:85103422923
SN - 0885-3010
VL - 68
SP - 1418
EP - 1429
JO - IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
IS - 4
ER -