An inspection apparatus used for inspecting a bare circuit board is provided, where the bare circuit board includes an antenna. The inspection apparatus includes a holding stage, a probing device, and a measurement device. The holding stage can hold the bare circuit board. The measurement device is electrically connected to the probing device and electrically connected to the antenna via the probing device. The measurement device can input a first testing signal to the antenna. The antenna can input a second testing signal to the measurement device after receiving the first testing signal. The measurement device can measure the antenna according to the second testing signal, where the first testing signal and the second testing signal both pass through no active component.

Provided are a measurement system and a radio wave shielding member that include a radio wave absorber that has light transmittance and absorbs radio waves other than the radio waves to be measured, and thus is suitable for the measurement of radio wave properties.

The measurement system includes a measuring target device 11, a measuring device 12 that emits and/or receives radio waves to measure the measuring target device, and a radio wave absorber 10 that has light transmittance and absorbs radio waves in and above the millimeter wave band. The radio wave absorber includes a transparent support member 2 and a radio wave absorbing sheet 1 that is attached to one surface of the support member. The radio wave absorbing sheet includes a resistive film 3, a dielectric layer 4, and a radio wave shielding layer 5 which are stacked on top of each other and all of which have light transmittance. The radio wave absorber blocks and/or absorbs unwanted radio waves around the measuring target device.

The present disclosure relates to a compact antenna test range (CATR) system. The CATR system comprises a measurement chamber, at least one feed antenna which is configured to transmit a radio frequency, RF, signal, at least one reflector which is arranged to reflect the RF signal towards a measurement area in the measurement chamber, and at least two preferably metallic calibration surfaces which can be arranged at two or more positions in the measurement area, wherein the calibration surfaces are configured to reflect a respective reflection of the RF signal back to the at least one reflector which is, in turn, configured to reflect the reflections of the RF signal back to the at least one feed antenna. The CATR system further comprises a measurement unit which is configured to receive the respective reflections of the RF signal and to determine and/or visualize a time difference between the reception of the respective reflections of the RF signal.

In an electromagnetic environment analysis system, an image creation unit creates an image for displaying information relevant to a measurement value in a position associated with a measurement position of each of the measurement values. A partition judgment unit judges a partition corresponding to the measurement position of each of the measurement values in a plurality of partitions forming a display range of the information relevant to the measurement value in the image, based on position information. A display information determination unit determines information relevant to the display of the partition, based on the measurement value corresponding to the partition. In a case where two or more measurement values measured at timings different from each other correspond to one partition, the display information determination unit calculates a representative value from the two or more measurement values, and determines information to be displayed in the partition, based on the representative value.

The present disclosure relates to an electronic device (10) comprising at least one electrically conductive structure (11) with a tubular shape having outer and inner surfaces (11c, 11d) covered by an insulating layer (12), and one or more integrated circuits (13) positioned within the electrically conductive structure (11).

The present invention is directed at an electromagnetic field detection device configured to continuously monitor properties of ambient electromagnetic fields. The device detects electromagnetic events that may be harmful to humans or cause the disruption of critical infrastructures. Monitored properties may include real-time electromagnetic field strength, peak electromagnetic field strength in a time period, electromagnetic field exceedance, and cumulative electromagnetic field dose. The device detects powerful microwave and millimeter wave electromagnetic emissions, as well as electromagnetic pulse events. The device may be integrated into a variety of products, including, but not limited to, a keychain attachment, lanyard attachment, eyeglasses frame, handheld instrument, identification card, writing instrument, or USB dongle. The device may be powered by internal dc power sources, external dc power sources, or energy harvesting.

An evaluation device includes a radio communication module that contains a temperature regulator that adjusts a temperature of a radio communication module to be evaluated, a housing case that houses the radio communication module and the temperature regulator, a gas supplier that supplies dry gas inside the housing case, and a measurement antenna that is disposed so as to face the radio communication module, and that transmits and receives radio waves for measurement. The housing case includes a case main body and a shutter plate that closes an opening of the case main body. The shutter plate is formed of a dielectric foam material, and the shutter plate is capable of contacting and separating from an open edge of the case main body. At least a part of the shutter plate separates from the open edge of the case main body to release gas from inside the housing case when an inner pressure of the housing case is greater than or equal to a predetermined value.

There is provided mechanisms for OTA calibration of an AAS. The AAS comprises N antenna branches, each of which comprises a respective subarray. The subarray of each antenna branch gives rise to a subarray antenna pattern extending over an angular interval. A method is performed by a test equipment. The method comprises obtaining measurement values for each of the antenna branches. At least one measurement value is obtained per each antenna branch. The method comprises determining one calibration factor value per antenna branch using the measurement values and taking the subarray antenna patterns into account. The method comprises applying the determined calibration factor values to the N antenna branches, thereby calibrating the AAS.

The present invention discloses an electromagnetic wave spatial analysis method based on multi-level dipole group modeling. The electromagnetic wave spatial analysis method includes the following steps: S1, obtaining a magnetic dipole group according to three-phase loops of power grids of various different voltage levels, and obtaining spatial coordinates of the magnetic dipole group according to the longitudes and latitudes as well as the altitudes of the power grids of various voltage levels; S2, calculating the loop length of each three-phase magnetic dipole according to the spatial coordinates of the magnetic dipole group, and obtaining a multi-level magnetic dipole group according to the loop lengths; S3, obtaining the current corresponding to the voltage on power transmission loops in the power grids of various voltage levels at different levels according to the installed capacities of the power grids of various voltage levels in different countries; S4, building a multi-level dipole model according to the multi-level magnetic dipole group and the current; and S5, solving the multi-level dipole model to obtain spatial power frequency electromagnetic wave distribution. The altitude factor of grid distribution is added in the present invention, and the power grids are divided into multiple levels for modeling analysis respectively, thereby increasing the analytical accuracy of power frequency electromagnetic waves.

A method and system of measuring a radio wave distribution of a radio signal source and estimating corresponding radio characteristics by using a flying vehicle is provided. The method includes the following steps. At a number of flight positions during a measurement process, a number of first radio signals transmitted by the radio signal source are measured by the flying vehicle. A position of the radio signal source is estimated according to the first radio signals and a radio channel model. A number of first radio characteristics of the first radio signal are obtained, and a radio wave distribution of the radio signal source is estimated according to the first radio characteristics of the first radio signals and a number of second radio characteristics of a number of second radio signals in the radio wave distribution are estimated according to the first radio characteristics of the first radio signals.