Apparatus and methods for testing of patch antennas are provided herein. In certain configurations, a method of electronic testing of patch antennas includes moving a patch antenna having a planar antenna element onto a test fixture using an automated handler, including positioning the patch antenna onto a portion of the test fixture between a first probe and a second probe. The method further includes coupling a test signal from the first probe to the planar antenna element without physically contacting the planar antenna element with the first probe, coupling the test signal from the planar antenna element to the second probe without physically contacting the planar antenna element with the second probe, and measuring a center frequency of the patch antenna based on an amount of coupling of the test signal from the first probe to the second probe by way of the planar antenna element.

A coupling circuit (20) with switching function for coupling an insulation monitoring device (6, 6a, 6b) to an unearthed power supply system (2, 2a, 2b), consisting of a coupling module (22) or a plurality of identical coupling modules (22) connected in series, wherein the coupling module (22) has at least one switch unit (25), which comprises a coupling impedance (26), a switch (24), arranged in series to the coupling impedance (26), for mains disconnection and a control circuit (28) for controlling the switch (24), and also exactly one transformer (30) for voltage supply and for potential separation.

Apparatus and methods for testing of patch antennas are provided herein. In certain configurations, a method of electronic testing of patch antennas includes moving a patch antenna having a planar antenna element onto a test fixture using an automated handler, including positioning the patch antenna onto a portion of the test fixture between a first probe and a second probe. The method further includes coupling a test signal from the first probe to the planar antenna element without physically contacting the planar antenna element with the first probe, coupling the test signal from the planar antenna element to the second probe without physically contacting the planar antenna element with the second probe, and measuring a center frequency of the patch antenna based on an amount of coupling of the test signal from the first probe to the second probe by way of the planar antenna element.

An apparatus and method for diagnosing the state of a power cable and measuring the remaining life thereof using VLF TD measurement data, and for determining a replacement time of a power cable using a 3D matrix exhibiting reproducibility of diagnosis of the state of the power cable. The apparatus and method for diagnosing the state of a power cable and measuring the remaining life thereof according to the present invention includes a Weibull modeling unit, a distance limiting unit, a data type classifying unit, a quantity representing unit, a normalization unit, a 3D constructing unit, a risk level calculating unit, and a remaining life measuring unit.

A method for determining a quality factor of a wireless charger is disclosed. The wireless charger includes an inverter, a filter, and a resonant tank circuit. The inverter receives a supply voltage and generates a PWM signal at a first node and a second node. The filter connects to the first and second nodes of the inverter to receive the PWM signal, and generates a filtered signal at a first terminal and a second terminal of a capacitor. The resonant tank circuit connects to the first and second terminals of the capacitor of the filter to receive the filtered signal, and provides wireless power at an inductor coil to a receiver. The method includes: issuing a current pulse to the resonant tank circuit; and in a Q-factor determination phase of the wireless charger, connecting the resonant tank circuit and only the capacitor of the filter in a resonance network.

Apparatus and methods for testing of patch antennas are provided herein. In certain configurations, a method of electronic testing of patch antennas is provided. The method includes positioning a patch antenna onto a test fixture, coupling a test signal from a first probe to the patch antenna, coupling the test signal from the patch antenna to a second probe, and measuring one or more electrical parameters of the patch antenna based on an amount of coupling of the test signal from the first probe to the second probe via the patch antenna. Thus, patch antennas can be measured via a non-destructive process, in which no direct electrical connection to the patch antenna's planar antenna element is needed.

A system for monitoring transformer bushings sensors, wherein first and second bushing sensors are connected to a common first phase of a high voltage source, and the third and fourth bushing sensors are connected to a common second phase of the high voltage source. A first time series is generated from the first and second bushing sensors during a predetermined time interval. A second time series, is generated from the third and fourth bushing sensors during the predetermined time interval. A correlation model for the first and second time series for determining a difference between a measured signal and an estimated signal, and generating a signal indicative of a bushing problem the difference is larger than a threshold.

A detecting device includes a reading coil configured to read a magnetic flux generated by a detecting coil for detecting a magnetic field of an electromagnetic wave output from an exciting coil according to the magnetic field. The detecting device further includes a Q-value measuring section configured to measure a Q-value of the detecting coil on a basis of a temporal transition of oscillation of a voltage obtained in the reading coil according to the magnetic flux generated by the detecting coil.

A method of measuring a Q-factor in a wireless power transmitter includes charging a capacitor in a LC tank circuit that includes a transmission coil to a voltage; starting a Q-factor determining by coupling the LC tank circuit to ground to form a free-oscillating circuit; monitoring the voltage across the capacitor as a function of time as the LC tank circuit oscillates; and determining the resonant frequency and the Q-factor from monitoring the voltage.

A method for determining a quality factor of an electrostatically actuated oscillator, the oscillator having a resonance frequency, the method including generating an excitation voltage defined as being the sum of a sinusoidal voltage and a voltage pulse; applying the excitation voltage at the input of the oscillator; acquiring in the time domain a response voltage present at the output of the oscillator after having ceased applying the excitation voltage at the input of the oscillator; determining the quality factor of the oscillator from the response voltage acquired at the output of the oscillator.