Abstract: The application relates to an ultrasonic transducer comprising a carrier with conductor traces and a piezoelectric element with electrodes, wherein the piezoelectric element has a contact side which is fixed on the carrier, and wherein the conductor traces and the electrodes are electrically coupled via the contact side of the element.

Abstract: An acoustic transponder (1) for an acoustic transmission system is described, comprising a transponder chip (2) and a piezoelectric element (4) for converting a carrier frequency into an electric voltage, the transponder (1) having a miniaturized design. Furthermore, a method for manufacturing a miniaturized transponder, the use of a miniaturized transponder, and an acoustic transmission system comprising the miniaturized transponder are described.

Abstract: A sound transducer and a method for operating a sound transducer are disclosed. In an embodiment a sound transducer includes a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer.

Abstract: In an embodiment a sensor system includes a housing, an electronic circuit and an ultrasonic distance sensor, wherein the electronic circuit and the ultrasonic distance sensor are arranged in the housing, and wherein the sensor system is configured to measure a distance between the sensor system and a surface of a material in a container by an echo propagation time of an ultrasonic burst in air.

Abstract: In an embodiment an acoustic transmission system includes a primary side having a transmitting unit configured to provide a transmit signal, a receiving unit configured to receive a received signal in response to the transmitted signal and an electroacoustic transducer configured to convert the transmit signal into an acoustic signal and an acoustic signal into the receive signal and a secondary side having a transponder configured to receive a receive signal and transmit a transmit signal and an electroacoustic transducer located between the primary side and the secondary side, the electroacoustic transducer having a medium permeable to acoustic signals.

Abstract: In an embodiment an ultrasonic transducer includes a container having an opening, a base and a wall, a piezoelectric disk arranged within the container on the base, a cover closing the container and an electronics system integrated in the cover, wherein the electronics system makes electrical contact with the piezoelectric disk and is configured to control and to read the piezoelectric disk.

Abstract: A sound transducer and a method for operating a sound transducer are disclosed. In an embodiment a sound transducer includes a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer.

Abstract: A Near Field Communication (NFC) enabled device is disclosed. The NFC device includes an antenna. The NFC device also includes an impedance matching network, a carrier frequency generator to generate a carrier wave, a receiver for receiving a magnetic induction wave, a transmitter, a driver circuit configured to alter an impedance of an antenna network associated with the antenna between a first impedance and a second impedance and a control unit. The control unit is configured to derive a first phase difference between the received magnetic induction wave and an internal clock at the first impedance and a second phase difference between the received magnetic induction wave and the internal clock at the second impedance. The control unit is further configured to change a phase of the carrier wave based on a difference between the first phase difference and a second phase difference.

Abstract: A Near Field Communication (NFC) enabled device is disclosed. The NFC device includes an antenna. The NFC device also includes an impedance matching network, a carrier frequency generator to generate a carrier wave, a receiver for receiving a magnetic induction wave, a transmitter, a driver circuit configured to alter an impedance of an antenna network associated with the antenna between a first impedance and a second impedance and a control unit. The control unit is configured to derive a first phase difference between the received magnetic induction wave and an internal clock at the first impedance and a second phase difference between the received magnetic induction wave and the internal clock at the second impedance. The control unit is further configured to change a phase of the carrier wave based on a difference between the first phase difference and a second phase difference.

Abstract: Active load modulation antennas for contactless systems typically require the presence of a battery power source in the transponder device. The transponder typically cannot be powered by the reader device alone and also transmit an active load modulation signal. Embodiments in accordance with the invention are disclosed that allow transponder devices to transmit an active load modulation signal when powered only by the reader in the contactless system.

Abstract: An apparatus and method are described for automatically matching the impedance of an antenna. An impedance matching network includes at least one variable impedance element and has an input for receiving a drive signal and an output connectable to an antenna. The impedance matching network includes a shunt capacitor in series between the input and output. A phase measuring measures the phase difference between the voltage and the current of the drive signal using the voltage drop across the shunt capacitor and outputs a measured phase signal. A voltage measuring circuit measures the magnitude of the voltage of the drive signal and the voltage drop across the shunt capacitor and outputs a measured drive voltage signal and shunt capacitor voltage signal.

Abstract: Active load modulation antennas for contactless systems typically require the presence of a battery power source in the transponder device. The transponder typically cannot be powered by the reader device alone and also transmit an active load modulation signal. Embodiments in accordance with the invention are disclosed that allow transponder devices to transmit an active load modulation signal when powered only by the reader in the contactless system.

Abstract: A carrier assembly for receiving an RFID transponder chip has an attachment side for being attached to a consumer device and an operation side for receiving an RF signal in operational use of the RFID transponder chip.

Abstract: A carrier assembly for receiving an RFID transponder chip has an attachment side for being attached to a consumer device and an operation side for receiving an RF signal in operational use of the RFID transponder chip.

Abstract: In a method of operating a transponder (1, 51) a parallel digital data stream comprised of a plurality of digital data sequences (23-25) is generated by the transponder (1, 51). Then, a plurality of modulated signals (42-44) by modulating each of the digital data sequences (23-25) with a dedicated carrier/subcarrier of a plurality of carriers/subcarriers (26-28) is generated. The modulated signals (42-44) are orthogonal to each other.