Abstract: The invention relates to a passive transponder system comprising a first or second conductor loop structure and a first and a second capacitive pressure sensor, wherein each conductor loop structure is coupled to one of said capacitive pressure sensors to form a resonant circuit, and the first conductor loop structure is positioned at a non-vanishing angle in relation to the second conductor loop structure. The resonant frequencies of the resonant circuits are selected such that they do not overlap to result in beating. The invention also relates to a pressure wave measuring device comprising such a passive transponder system, and a readout unit.

Abstract: The invention relates to a passive transponder having at least one coil, the transponder having an electrically conductive shield which covers the windings of the coil from both sides. A central region of the coil around which the windings are wound is not covered by the shield. In the surfaces, in which the shield covers the windings, the shield has at least one discontinuity by which a current flow in the shield can be prevented.

Abstract: The invention relates to a passive transponder system comprising a first or second conductor loop structure and a first and a second capacitive pressure sensor, wherein each conductor loop structure is coupled to one of said capacitive pressure sensors to form a resonant circuit, and the first conductor loop structure is positioned at a non-vanishing angle in relation to the second conductor loop structure. The resonant frequencies of the resonant circuits are selected such that they do not overlap to result in beating. The invention also relates to a pressure wave measuring device comprising such a passive transponder system, and a readout unit.

Abstract: The invention relates to a passive transponder having at least one coil, the transponder having an electrically conductive shield which covers the windings of the coil from both sides. A central region of the coil around which the windings are wound is not covered by the shield. In the surfaces, in which the shield covers the windings, the shield has at least one discontinuity by which a current flow in the shield can be prevented.

Abstract: The invention relates to a transponder system having at least one passive transponder, which has a resonant circuit having a variable resonant frequency, and having a readout device, wherein the readout device is designed to modify a frequency of the readout signal to the variable resonant frequency of the resonant circuit. The invention additionally relates to a method for readout of a passive transponder, which has a resonant circuit having a variable resonant frequency.