Fig. 2: FIDT characteristics.
From: A toroidal SAW gyroscope with focused IDTs for sensitivity enhancement
a Schematic diagram of the FIDT structural parameters. b The metallic pillars located at the antinodes of the standing wave can increase the strength of the Coriolis force, which causes a secondary SAW. c FIDT response characteristics for various geometric focal lengths. d The geometric focal length has an effect on both the active area and the vibration amplitude of the SAW. The left axis shows the relative transmission range depending on the geometric focal length. The right axis shows the relative amplitude curves for different geometric focal lengths. e Equivalent aperture for different degrees of arc Da. f The capacitance of the FIDTs is affected by the number of pairs and the equivalent aperture
