Abstract: The invention relates to a surface acoustic wave resonator produced on a cut substrate with propagation axes for which a nonzero directivity exists and comprising at least one central transducer (Tc) exhibiting a central axis, a first array of reflectors (R1) and a second array of reflectors (R2), said arrays being situated on either side of said transducer, characterized in that the two arrays of reflectors exhibit nonsymmetric configurations with respect to the central axis of said central transducer. The introduction of an asymmetry makes it possible to strongly attenuate the parasitic resonances which may appear when the resonators are produced notably on piezoelectric substrates of quartz type or any other material and cut with propagation axes for which there exists a natural directivity (LiTaO3, LiNbO3, langasite, GaPO4, LiB4O7, KNbO3, etc.).

Abstract: The invention relates to a surface acoustic wave resonator produced on a cut substrate with propagation axes for which a nonzero directivity exists and comprising at least one central transducer (Tc) exhibiting a central axis, a first array of reflectors (R1) and a second array of reflectors (R2), said arrays being situated on either side of said transducer, characterized in that the two arrays of reflectors exhibit nonsymmetric configurations with respect to the central axis of said central transducer. The introduction of an asymmetry makes it possible to strongly attenuate the parasitic resonances which may appear when the resonators are produced notably on piezoelectric substrates of quartz type or any other material and cut with propagation axes for which there exists a natural directivity (LiTaO3, LiNbO3, langasite, GaPO4, LiB407, KNbO3, etc.

Abstract: The invention relates to a remotely interrogable SAW (surface acoustic wave) temperature sensor comprising. At least two resonators (T1, saw, T2, saw) have transducers having interdigitated electrodes connected to control buses of design such that they have different characteristic operating frequencies. A first resonator has a first surface acoustic wave propagation direction, parallel to one of the axes of the substrate, and a second resonator has a surface acoustic wave propagation direction making a nonzero angle (?) with the propagation direction of the first resonator. The control buses of the second transducer are inclined at a nonzero angle (?) to the normal to the interdigitated electrodes of the second transducer so as to compensate for the power flow divergence of the acoustic waves along the second transducer.

Abstract: The invention relates to a remotely interrogable SAW (surface acoustic wave) temperature sensor comprising, on the surface of a quartz substrate cut along the direction Y? making an angle ? with the direction Y, at least two resonators (T1,SAW, T2,SAW) comprising transducers consisting of interdigitated electrodes connected to control buses of design such that they have different characteristic operating frequencies; and a first resonator having a first surface acoustic wave propagation direction, parallel to one of the axes of the substrate, and a second resonator having a surface acoustic wave propagation direction making a nonzero angle (0) with the propagation direction of the first resonator, characterized in that the control buses of the second transducer are inclined at a nonzero angle (?) to the normal to the interdigitated electrodes of said second transducer so as to compensate for the power flow divergence of the acoustic waves relative to the direction of propagation of the surface acoustic waves

Abstract: The component essentially comprises two correlators (TR1, F1), (TR2, F2) shifted by one period or cycle from the information element. This component fulfils both the correlation and delay functions. The component also comprises a transmission channel with a filter identical to the correlator of the reception channel.Application to radiocommunications.