Disclosed herein is a system for measuring a microwave dielectric property of a solid material under force. The system measures the microwave dielectric property of the solid material under a horizontal pressure. A shield case for microwave electromagnetic shielding is provided outside the system. The shield case includes a layer of pure aluminum and a layer of pyramids made of a microwave absorbing material. A manual hydraulic pump controls loading and unloading of a pressure loading device.

A method, a resonant cavity and a system for measuring a complex permittivity a and identifying of a sample (solid or liquid) of microliter volume size is disclosed. The method including using a network analyzer to measure over a defined millimeter wave frequency range, a first resonance frequency at a cavity resonance mode, and calculating an unloaded quality factor of an enclosed resonant waveguide cavity of a defined internal dimensions, placing a sample on a surface of a bottom wall of the resonant waveguide cavity and measure a second resonance frequency and calculating a loaded quality factor; determining, a resonance frequency shift f=(f.sub.sf.sub.o), determining a complex permittivity of the sample according to the resonance frequency shift f, the loaded quality factor, the unloaded quality factor and the defined internal dimensions; and identifying the sample using a database through the complex permittivity .

A device for measuring absorbent bodies that are spaced from each other on a continuous web comprises at least two microwave resonators configured to measure values of a shift of a resonance frequency and a spreading of a resonance frequency. The continuous web moves through the at least two microwave resonators and the at least two microwave resonators are positioned at an offset with respect to each other in the transverse and transport direction relative to a direction of transport of the continuous web in order to measure the entire width of the continuous web. At least one of a moisture and a density of the absorbent bodies is determined using the at least two microwave resonators to continuously determine the values of the shift of the resonance frequency and the spreading of the resonance frequency.

A specific conductivity measurement method includes: performing first measurement to obtain a resonance frequency f.sub.1 that is outputted to a measuring device when the first and second dielectric flat plates each have a thickness t.sub.1, and an unloaded Q.sub.u1 that corresponds to the resonance frequency f.sub.1; performing second measurement to obtain a resonance frequency f.sub.2 that is outputted to the measuring device when the first and second dielectric flat plates each have a thickness t.sub.2 that is different from the thickness t.sub.1, and an unloaded Q.sub.u2 that corresponds to the resonance frequency f.sub.2; and calculating a specific conductivity .sub.r of the copper foil and the first and second conductor flat plates based on an arithmetic equation that includes the resonance frequency the unloaded Q.sub.u1, the resonance frequency f.sub.2, and the unloaded Q.sub.u2.

An input device is disclosed that provides reduced electromagnetic emissions while detecting the presence of an input object. In one embodiment, a first set of sensor electrodes is driven with a first modulated signal while a second set of sensor electrodes is driven with a second set of modulated signals that is based on an inverted first modulated signal. The first set of sensor electrodes may determine a capacitance value while the second set of sensor electrodes may reduce electromagnetic emissions associated with the first set of sensor electrodes.

A device for measuring absorbent bodies that are spaced from each other on a continuous web comprises at least two microwave resonators configured to measure values of a shift of a resonance frequency and a spreading of a resonance frequency. The continuous web moves through the at least two microwave resonators and the at least two microwave resonators are positioned at an offset with respect to each other in the transverse and transport direction relative to a direction of transport of the continuous web in order to measure the entire width of the continuous web. At least one of a moisture and a density of the absorbent bodies is determined using the at least two microwave resonators to continuously determine the values of the shift of the resonance frequency and the spreading of the resonance frequency.

Provided is a technology for detecting a change in an inspection target containing moisture. A sensor circuit (1) for inspecting property of an inspection target includes an oscillator (20) having a resonance frequency of 30 to 200 GHz, and a detection circuit (3) that estimates an oscillation frequency of the oscillator.

Disclosed herein is a system for measuring a microwave dielectric property of a solid material under force. The system measures the microwave dielectric property of the solid material under a horizontal pressure. A shield case for microwave electromagnetic shielding is provided outside the system. The shield case includes a layer of pure aluminum and a layer of pyramids made of a microwave absorbing material. A manual hydraulic pump controls loading and unloading of a pressure loading device.

In a dielectric characteristic measurement method, a step of mounting a sample of which dielectric characteristic is measured on an open resonator and adjusting a position of the sample includes: a first measurement step for performing a first resonance measurement by sweeping a predetermined sweep frequency range at a first number of measurement points; and a second and subsequent measurement steps for performing a plurality times of resonance measurement following the first resonance measurement, wherein each of the plurality times of resonance measurement is performed by sweeping a sweep frequency range specified based on an immediately preceding resonance measurement at a second number of the measurement points which is less than the first number of the measurement points, and the sweep frequency range of a second resonance measurement in the plurality times of resonance measurement is specified based on the first resonance measurement.

A measuring device for determining the dielectric value of a medium in a phase-based manner comprises a measurement section which can be brought into contact with the medium, a signal generation unit for injecting a high-frequency signal at a defined frequency into the measurement section, and an evaluation unit designed to receive a corresponding reception signal after said high-frequency signal passes through the measurement section, to determine a phase shift between the high-frequency signal and the reception signal, and to determine the dielectric value of the medium on the basis of the determined phase shift. The measuring device also comprises at least one filter which transmits the frequency of the high-frequency signal and is arranged such that the received reception signal and/or the generated high-frequency signal is/are filtered. This ensures that the determined dielectric value is not distorted by noise caused by components or the environment.