12results about "Shielding efficiency measurement" patented technology

Apparatus and associated methods relate to a bond-degradation device for testing EMI susceptibility and / or emission suppression of an electrical control system that includes a shielded cable assembly. The bond-degradation device includes a resistive annulus configured to be interposed between normally-connected first and second shielded connectors of the electrical control system. The resistive annulus introduces a resistance between shields of the normally-connected first and second shielded connectors, thereby compromising integrity of the shielding of conductive wires within the shielding of the shielded cable assembly by increasing loop resistance of the shielding.

Various devices and techniques help to reduce the entry of unwanted radio waves into an enclosure and reduce the reflection of radio waves inside the enclosure. Such devices and techniques enable a test environment inside the enclosure that provides high-quality functionality and performance testing.

The invention relates to the technical field of building wall electromagnetic shielding, and particularly discloses an electromagnetic shielding method for a building wall, which comprises the following steps of: S1, determining an axis, and releasing a middle line and a side line of the wall by taking the axis as a datum line; insulating plates are laid on the floor, a keel frame is built according to the paying-off position, and the keel frame is fixedly installed on the wall and the ceiling through insulating parts; the keel frame is electrically isolated from the building main body through the insulating plate and the insulating part; s2, opening holes used for installing a shielding door and a shielding window are formed in the keel frame, and a shielding plate is installed on the ground insulation plate and the keel frame; conductive linings are arranged at connection gaps among the keel frame, the shielding plate, the shielding door and the shielding window, and the conductive linings enable the shielding structures to form a continuous conductive shielding surface.

The invention relates to a curtain (31) for shielding an electromagnetic field, comprising a plurality of strip elements (33), wherein a first strip element and a second strip element of the plurality of strip elements (33) have an electrically conductive layer (38), and wherein the electrically conductive layer (38) of the first strip element is electrically connected in a shielding configuration of the curtain (31) to the electrically conductive layer (38) of the second strip element and / or to an electrical connection for a reference potential, wherein the plurality of strip elements (33) are variably positionable relative to one another. The invention further relates to a shielded enclosure with a curtain (31) according to the invention and to a magnetic resonance system with a shielded enclosure according to the invention.

To provide an electromagnetic wave absorber evaluation device and an electromagnetic wave absorber evaluation method capable of precisely evaluating behavior of an electromagnetic wave absorber for millimeter wave band or submillimeter wave band electromagnetic waves.SOLUTION: In an electromagnetic wave absorber evaluation device 1, width (a), height (b), and length L of a casing 2 for housing a board 3 having microstrip lines 4, 5 for inputting and outputting signals, and an evaluation frequency ft obtained by the following formula (1) satisfies the following formula (2) in a frequency domain of 20GHz or higher, wherein α is expressed by the following formula (5).SELECTED DRAWING: Figure 1

This application discloses an RF shielding device and its design method for pod testing, belonging to the technical field of pod testing. The RF shielding device includes: a shielding shell with a pod interface on its side wall, through which the pod antenna radome enters the shielding shell; an absorbing layer disposed on the inner wall of the shielding shell for absorbing the RF signal output by the pod and interference signals from outside the shielding shell; a test antenna disposed within the shielding shell for receiving the RF signal; and an RF interface disposed on the side wall of the shielding shell, connected to the test antenna for connecting to pod testing equipment. Compared to traditional anechoic chambers, this provides a convenient and safe radiation testing environment for pods, thus reducing the difficulty of pod radiation testing.

A telematics verification system for testing vehicle telematics systems includes: a conductive ground plane adapted to be positioned under the vehicle when testing the vehicle telematics system using the telematics verification system; a conductive cover adapted to be positioned on the outer surface of the vehicle and above and around the vehicle antenna when testing the vehicle telematics system using the telematics verification system; a downlink antenna adapted to be arranged inside the conductive cover, wherein the downlink antenna is configured to wirelessly transmit downlink signals within the conductive cover, wherein the downlink signals are wirelessly receivable by the vehicle antenna; and an uplink antenna adapted to be arranged inside the conductive cover, wherein the uplink antenna is configured to wirelessly receive uplink signals within the conductive cover, wherein the uplink signals are wirelessly receivable by the vehicle antenna.

The invention discloses a shielding cable shielding effectiveness optimization method, which comprises the following steps: acquiring cable parameters, and establishing a three-dimensional geometric solid model of a high-voltage shielding cable based on the cable parameters; bending-deformation coupling modeling is carried out according to the three-dimensional geometric solid model, and deformation parameters are obtained through calculation; wherein the deformation parameter represents the microscopic geometric change of the shielding layer; evaluating the shielding effectiveness of the cable based on the deformation parameters; comparing the shielding effectiveness with a preset threshold value to determine a shielding effectiveness unqualified point; and optimizing the unqualified points of the shielding effectiveness. According to the method, the three-dimensional geometric solid model and the bending-deformation coupling model are established, the microstructure change of the shielding layer caused by deformation is obtained, and quantitative evaluation of the shielding effectiveness is realized based on electromagnetic simulation, so that unqualified points of the shielding effectiveness are optimized; the problem of shielding effectiveness attenuation caused by mechanical deformation in practical application can be effectively analyzed, and evaluation accuracy and optimization efficiency are improved.

An electromagnetic wave absorber evaluation apparatus including: a housing in which the electromagnetic wave absorber is allowed to be arranged, the housing being made of a conductive material with inner dimensions of a width a, a height b, and a length L, as b<a<L; a substrate arranged inside the housing; an input microstrip line and an output microstrip line formed on the substrate along a length direction of the housing and separated from each other in the length direction; and a signal inspecting unit capable of inputting an input signal having a frequency of 20 GHz or more into the input microstrip line and detecting an output signal output through the output microstrip line, in which an evaluation frequency ft obtained by the Formula (1) satisfies the Formula (2) in a frequency region of 20 GHz or more.

The invention provides a gradient magnetic field testing method and device for a magnetic shielding barrel. The gradient magnetic field testing device comprises a magnetic gradient testing unit, a supporting assembly and a connecting rod. An atom magnetometer can be nested in the magnetic gradient test unit to form a single magnetic field test unit. A plurality of magnetic gradient test units can be combined through the connecting rods to form a magnetic field gradient test array to adapt to the space in the shielding barrel. The magnetic field gradient test array can be connected with the supporting assembly, so that the magnetic field gradient test array is fixed in the shielding barrel and has mobility, and magnetic field distribution in the shielding barrel can be completely tested. According to the technical scheme, the technical problems that in the prior art, a visual large-range magnetic field imaging device is lacked, actual magnetic field gradient testing and compensation are lacked for a magnetic shielding barrel which is actually produced, processed and manufactured, and the space gradient in the magnetic shielding barrel can serve as an error term to be introduced into a magnetometer testing result are solved.

A shield enclosure includes a housing with a peripheral wall that defines a cavity, and a cover removably coupleable to the housing to at least partially seal the cavity. The cavity is sized to receive a printed circuit board therein. The housing shields the printed circuit board from electromagnetic interference and noise during noise figure testing of a radiofrequency component on the printed circuit board.

The application relates to an electrostatic discharge pulse suppression device for electromagnetic compatibility detection, which comprises a shielding packaging shell, an electrostatic discharge pulse suppression circuit board in the shielding packaging shell, and an A port and a B port at two ends of the shielding packaging shell, wherein the A port and the B port each comprise a 2-wire port, an 8-wire Ethernet port and a vehicle-mounted Ethernet port which are connected with each other, an A-end overvoltage protection unit, an A-end first-stage pulse suppression unit, an A-end second-stage pulse suppression unit, an A-end filtering decoupling unit, a B-end filtering decoupling unit, a B-end second-stage pulse suppression unit, a B-end first-stage pulse suppression unit and a B-end overvoltage protection unit are sequentially connected on the electrostatic discharge pulse suppression circuit board, the A port is an input end of the A-end overvoltage protection unit, the B port is an input end of the B-end overvoltage protection unit, and the shielding packaging shell is grounded. The electrostatic discharge pulse suppression process can be realized while the communication connection is not interrupted; the port versatility is high, and the applicability of the electromagnetic compatibility test is greatly improved.