The design and performance of a novel wireless and passive gyroscope based on the surface acoustic wave (SAW) gyroscopic effect on a 128° YX LiNbO₃ substrate utilizing two parallel reflective delay lines with opposite directions is described. A theoretical model dealing with the gyroscopic effect using the surface effective permittivity method was established. A coupling of modes (COM) model was used to determine the optimal design parameters of the SAW devices prior to fabrication. The sensor performance towards external applied rotation was evaluated by the precise rate table referring to the network analyzer and antenna as the wireless reader unit. Good phase sensitivity and excellent linearity were observed in the measured results.

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