The present disclosure describes a strained dielectric material comprising at least one type of component containing a domain wall variant pattern, or superdomain structure, that is in phase-co-existence with, or in close phase proximity to, a paraelectric state achieved at zero electric field or over a finite range of non-zero electric field, wherein the at least one type of component comprises one or more of an in-plane sub-domain polarization component, a plane-normal sub-domain polarization component, or a solid solution of a ferroelectric.

The disclosure relates to a compensation capacitor for an antenna of a magnetic resonance scanner and a corresponding antenna with a compensation capacitor. The compensation capacitor has a first electrode and a second electrode arranged in parallel. An insulation material configured to resist high voltages and a dielectric with low dielectric losses are arranged between the first and the second electrode. The second electrode and/or the dielectric may be moved relative to the first electrode such that a surface area of a projection of the surface of the first electrode along the surface normal of the first electrode to the surface of the second electrode and/or the dielectric is variable.

A method for assembling a force sensitive capacitor is provided. The method comprises: assembling an insulating member to a rear end of a rear-end moving part; inserting a front-end moving part and the rear-end moving part into a case from a front end and a rear end of the case, respectively, and assembling connecting portions of the front-end moving part and the rear-end moving part; assembling a compressible conductor to a front end of a conductor base; and inserting the conductor base into the case from the rear end of the case and assembling the conductor base to the case.

The disclosure relates to a compensation capacitor for an antenna of a magnetic resonance scanner and a corresponding antenna with a compensation capacitor. The compensation capacitor has a first electrode and a second electrode arranged in parallel. An insulation material configured to resist high voltages and a dielectric with low dielectric losses are arranged between the first and the second electrode. The second electrode and/or the dielectric may be moved relative to the first electrode such that a surface area of a projection of the surface of the first electrode along the surface normal of the first electrode to the surface of the second electrode and/or the dielectric is variable.

Design and construction is described for remotely-controllable variable MRI-compatible low-noise inductors and capacitors, each having a wide variation range and each occupying a volume of no more than 30 cubic centimeters. To optimize noise figure in 3-tesla medical MRI antenna arrays, an exemplar capacitor is connected in series following an antenna element and an exemplar inductor is connected in shunt following an exemplar capacitor. Exemplar Inductors are constructed as a pair of flux-coupled coils which are connected by a movable or rotatable contactor positioned by folded and nested stepping mechanisms. Exemplar inductors are constructed from two flux-coupled parallel solenoid coils or from two flux-coupled toroid-segment coils. Exemplar capacitors are designed and constructed in an analogous manner. Other miniature inductor and capacitor embodiments are possible. Miniature variable resistor embodiments can be constructed in a manner analogous to that of the capacitors.

A capacitive rocker potentiometer includes a circuit board, a seat body, a slider, a rocker arm, a rocker rod, an insulation sheet, and a variable capacitor. The seat body is disposed on the circuit board and defines a sliding groove, the slider is disposed in the sliding groove of the seat body, and the slider is connected with the insulation sheet. The rocker arm is rotatably disposed on the seat body and is provided with a pulling head configured to slide the slider back and forth, and the rocker rod is connected to the rocker arm. The variable capacitor includes first and second electrode plates corresponding to each other, and the first and second electrode plates are electrically connected to the circuit board. The insulation sheet is inserted between the first and second electrode plates and configured to move back and forth between the first and second electrode plates.

The present disclosure describes a strained dielectric material comprising at least one type of component containing a domain wall variant pattern, or superdomain structure, that is in phase-co-existence with, or in close phase proximity to, a paraelectric state achieved at zero electric field or over a finite range of non-zero electric field, wherein the at least one type of component comprises one or more of an in-plane sub-domain polarization component, a plane-normal sub-domain polarization component, or a solid solution of a ferroelectric.