Abstract: Aspects of the disclosure relate to devices, wireless communication apparatuses, methods, and circuitry implementing bulk wave suppression in a stacked electroacoustic device. One aspect includes a first substrate comprising a first surface and a second surface, where the second surface is opposite the first surface, a first AW resonator circuit positioned on the first surface of the first substrate, a plurality of elements including a first element, where the plurality of elements are positioned on the second surface of the first substrate, and where the first element is aligned with the first AW resonator circuit, and a second substrate comprising a first surface and a second surface, where the plurality of elements are positioned on the first surface of the second substrate, and where the plurality of elements create a cavity between the first substrate and the second substrate.

Abstract: A surface coil for a nuclear magnetic resonance apparatus has a number of conductor sections arranged relative to each other. These sections can be connected to one another to a reception unit by employing switches to enclose a preferable conductor geometry to obtain a localized image. The active coil segments form reception loops of various size and/or position. Every possible reception loop which may be created by activating various segments contains both a first variable capacitance and a second variable capacitance serving as a serial connection between the reception loop and the signal line or the signal reference line. Such an arrangement allows for activation of individual coil segments which are tuned to the resonance frequency of the nuclear magnetic resonant apparatus and which are adapted to the impedance of the input lines of the evaluation unit.