Abstract
Interdigital transducer and signal transmission in surface acoustic wave pressure sensor design is one of the difficulties in sensor design. The transmission antenna is an important design indicator to determine the wireless function of the sensor. In this paper, we simulated the design of the interdigital transducer of surface acoustic wave pressure sensor through COMSOL and analyzed the relationship between the eigenfrequency of the single-pair interdigital model and the interdigital electrode. Then, we obtained the design of the interdigital electrode with error of 0.01 MHz. We also simulated the size, bandwidth, impedance matching, and other parameters of antenna through high frequency structure simulator, and a matching dipole transmission antenna was designed and miniaturized. When the bandwidth is satisfied, the control matching impedance error is within [Formula: see text], and it is verified that the antenna satisfies the signal transmission requirement of the surface acoustic wave pressure sensor. This design provides a more comprehensive approach to the design of interdigital transducers and signal transmission for the field of surface acoustic wave measurement pressure.
Highlights
Background and research statusSince Rayleigh proposed the concept of surface acoustic wave (SAW) in 1885, a large number of researchers have studied SAWs
According to the design principle of SAW pressure sensor and the design concept of transmission antenna, this paper studies the model of SAW cross-finger transducer and its matching antenna and proposes an optimal design scheme
According to the eigenfrequency requirement of the SAW sensor, the eigenfrequency of the antenna designed in this paper is set at 915 MHz, the bandwidth is greater than 50 MHz at a voltage standing wave ratio (VSWR) of 1.5, and the matching impedance is 50 O
Summary
Since Rayleigh proposed the concept of surface acoustic wave (SAW) in 1885, a large number of researchers have studied SAWs. The design of the SAW pressure sensor transmission antenna is an important factor that restricts the size of the sensor. Stelzer et al.[11] offer a temperature measurement solution using SAW tags. According to the design principle of SAW pressure sensor and the design concept of transmission antenna, this paper studies the model of SAW cross-finger transducer and its matching antenna and proposes an optimal design scheme. The solution provides a design idea of a SAW sensor and its matching antenna. It can introduce the design method of the interdigital transducer (IDT) better, and describe the design requirements of the antenna in detail. We propose a feasible method for the signal transmission of the SAW devices
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