A method of interrogating an acoustic wave sensor comprises transmitting, by an interrogator, an interrogation radiofrequency signal to the acoustic wave sensor by way of a transmission antenna, receiving, by the interrogator, a response radiofrequency signal from the acoustic wave sensor by way of a reception antenna, and processing by a processing means of the interrogator the received response radiofrequency signal to obtain in-phase and quadrature components both in the time domain and the frequency domain, determining by the processing means perturbations of the obtained in-phase and quadrature components both in the time domain and the frequency domain and determining by the processing means a value of a measurand based on the detected perturbations.

Embodiments of the invention include delay line circuitry that is integrated with an organic substrate. Organic dielectric material and a plurality of conductive layers form the organic substrate. The delay line circuitry includes a piezoelectric transducer to receive a guided electromagnetic wave signal and to generate an acoustic wave signal to be transmitted with an acoustic transmission medium. An acoustic reflector is communicatively coupled to the acoustic transmission medium. The acoustic reflector receives a plurality of acoustic wave signals from the acoustic transmission medium and reflects acoustic wave signals to the piezoelectric transducer using the acoustic transmission medium. The transducer converts the reflected acoustic signals into electromagnetic waves which are then transmitted back through the antenna and decoded by the reader.

An RFID tag (1) is configured to transmit a predetermined code (3.sub.K) as a RF backscattered radiation (2) in response to an impinging RF signal (41). The RFID tag (1) is configured to react to an impinging signal at a predetermined reference frequency (23) with a reference backscattered signal (2.sub.R). The RFID tag (1) is also configured and to react to an impinging signal (41) at any of a group of transmission frequencies (21, 22) with coding backscattered signals (2.sub.F-G) whose amplitudes (20.sub.A, 20.sub.B) relative to the amplitude (20.sub.R) of the reference backscattered signal define the code (3.sub.K). An RFID reader (4), a kit (5) and a method for transmitting a message from a device (1) to a reader (4) as a RF backscattered radiation (2) in response to an impinging RF signal (41).

Embodiments of the invention include delay line circuitry that is integrated with an organic substrate. Organic dielectric material and a plurality of conductive layers form the organic substrate. The delay line circuitry includes a piezoelectric transducer to receive a guided electromagnetic wave signal and to generate an acoustic wave signal to be transmitted with an acoustic transmission medium. An acoustic reflector is communicatively coupled to the acoustic transmission medium. The acoustic reflector receives a plurality of acoustic wave signals from the acoustic transmission medium and reflects acoustic wave signals to the piezoelectric transducer using the acoustic transmission medium. The transducer converts the reflected acoustic signals into electromagnetic waves which are then transmitted back through the antenna and decoded by the reader.

A computer system is communicably coupled to one or more sensor devices. The computer system obtains a database of stored acoustic signatures characterizing predefined acoustic signals generated by passive tags in response to physical motion of the passive tags. The passive tags are associated with non-provisioned devices, and the acoustic signatures are associated with sets of executable instructions for provisioning the non-provisioned devices. A first acoustic signal characterized by a respective acoustic signature and generated by a first passive tag is detected. In response, and based on the respective acoustic signature and information in the database, a first non-provisioned device associated with the respective acoustic signature is identified, and a first set of executable instructions for provisioning the first non-provisioned device is identified. After, the computer system causes execution of the first set of executable instructions, thereby causing to commence a software process for provisioning the first non-provisioned device.

Embodiments of the invention include delay line circuitry that is integrated with an organic substrate. Organic dielectric material and a plurality of conductive layers form the organic substrate. The delay line circuitry includes a piezoelectric transducer to receive a guided electromagnetic wave signal and to generate an acoustic wave signal to be transmitted with an acoustic transmission medium. An acoustic reflector is communicatively coupled to the acoustic transmission medium. The acoustic reflector receives a plurality of acoustic wave signals from the acoustic transmission medium and reflects acoustic wave signals to the piezoelectric transducer using the acoustic transmission medium. The transducer converts the reflected acoustic signals into electromagnetic waves which are then transmitted back through the antenna and decoded by the reader.

A surface acoustic wave tag device is disclosed, comprising: an acoustic wave propagating substrate, at least one transducer structure comprising inter-digitated comb electrodes, and at least one reflecting means, the reflecting means comprising at least one reflector, wherein the acoustic wave propagation substrate is a composite substrate comprising a base substrate and a piezoelectric layer, wherein the crystallographic orientation of the piezoelectric layer with respect to the base substrate is such that the propagation of a shear wave inside the piezoelectric layer and in the direction of propagation corresponding to the acoustic wave is enabled. A physical quantity determining device and a fabrication method of such surface acoustic wave tag device are also disclosed.

A surface elastic wave resonator comprises a piezoelectric material to propagate the surface elastic waves and a transducer inserted between a pair of reflectors comprising combs of interdigitated electrodes and having a number Nc of electrodes connected to a hot spot and an acoustic aperture W wherein the relative permittivity of the piezoelectric material is greater than about 15, a product of Nc.Math.W/fa for the transducer being greater than 100 m.Math.MHz.sup.1, where fa is the antiresonance frequency of the resonator. A circuit comprises a load impedance and a resonator according to the invention and having an electrical response manifesting as a peak in the coefficient of reflection S.sub.11 at a frequency of a minimum value of the parameter S.sub.11 that is lower than 10 dB, the antiresonance peak of the resonator being matched to the impedance of the load.

A container includes a surface defining a volume of the container, a first resonance portion disposed on a first portion of the surface of the container using one or more first carbon-based inks, and a second resonance portion disposed on a second portion of the surface of the container using one or more second carbon-based inks different than the one or more first carbon-based inks. The first resonance portion can resonate within a first range of frequencies in response to one or more electromagnetic pings received from a user device, and the second resonance portion can resonate within a second range of frequencies in response to the one or more electromagnetic pings, the second range of frequencies being different than the first range of frequencies. In some instances, the user device may be a smartphone, a radio frequency identification (RFID) reader, or a near-field communication (NFC) device.

Remote keyless entry (RKE) systems and devices are described. The RKE devices include one or more passive radios that respond to an interrogation signal from an interrogating device such as a vehicle. The passive radio sends a responsive signal that can include a decaying portion representing a ringdown signal. The passive radio includes a SAW resonator in some situations.