Abstract: A chassis shielding effectiveness evaluation system includes a chassis having a chassis ground. A board is located in the chassis and includes a board ground layer. A signal generator includes at least one ground member coupled to the chassis ground and a signal member coupled to the board ground layer. The signal generator is operable to send a signal through the signal member to the board ground layer.

Abstract: A method and apparatus for improving yield ratio of testing are disclosed. The method includes the following steps. First of all, devices are tested and electromagnetic interference is measured. Next, the test results are examined for whether the devices pass the test or not. Then, electromagnetic interference data are examined for whether the electromagnetic interference data are over a predetermined standard if the devices fail the test. The above-mentioned steps are performed again if the electromagnetic interference data are over a predetermined standard. The test is terminated if the devices still fail the test and the values of electromagnetic interference are still over a predetermined standard.

Abstract: A measuring system minimizes the parasitic affects of lumped circuit elements. The system includes two or more in-situ interfaces configured to conductively link a source to an internal load and an external load. The in-situ interfaces are linked to a shunt conductor. Two or more linear and dynamic elements conductively link the in-situ interfaces in series. The dynamic elements are configured to overwhelm the parasitic self-capacitance of an input circuit coupled to at least one of the in-situ interfaces. A shield enclosing at least one of the linear and dynamic elements has a conductive surface to fields and electromagnetic interference. The shield has attenuation ratios that substantially dampen the parasitic capacitance between the linear and dynamic elements that bridge some of the in-situ interfaces.

Abstract: An interference exclusion capability testing apparatus is provided for use in testing interference exclusion capability of a specimen by radiating an electromagnetic wave toward the specimen from a radiating antenna. The radiating antenna includes an electromagnetic horn, and a waveguide plate that guides an electromagnetic wave radiated from the electromagnetic horn to the specimen.

Abstract: A chassis shielding effectiveness evaluation system includes a chassis having a chassis ground. A board is located in the chassis and includes a board ground layer. A signal generator includes at least one ground member coupled to the chassis ground and a signal member coupled to the board ground layer. The signal generator is operable to send a signal through the signal member to the board ground layer.

Abstract: A method for mini module EMI shielding effectiveness evaluation comprises providing a test vehicle including at least one test platform. The test platform includes at least one mini emitter, a mini receiver with a reference shield, and a mini receiver with a shield under test. EMI shielding effectiveness transmission signals are applied to the at least one mini emitter. Signals received by the mini receiver with a shield under test and the mini receiver with the reference shield are evaluated. The mini emitter, mini receiver with the reference shield, and mini receiver with the shield under test comprise components fabricated concurrently and under fabrication conditions used for fabrication of the test platform of the test vehicle. As used herein, a mini emitter and mini receiver may be interchanged according to the requirements of a given EMI shielding effectiveness evaluation.

Abstract: Embodiments include systems and methods for over-the-air testing of wireless systems. Embodiments comprise separated anechoic chambers containing wireless devices. The anechoic chambers are connected by propagation path corridors.

Abstract: An orthogonal array is formed by performing electromagnetic field analysis only once and determining a range by using the mount position and type of a capacitor and the number of capacitors as parameters to perform circuit analysis a small number of times. An estimation equation is formed by using as an index a result of the absolute value of the calculated power source impedance, and a capacitor is disposed to reduce noises by using the estimation equation.

Abstract: A system for testing radio frequency (RF) communications of a device capable of such communications is provided. The system includes a chamber for isolating the device from RF interference, an antenna that is suitable for RF communications with the device wherein the antenna is capable of communications over a range of frequencies, the antenna being located within the chamber, and a digital communication link for providing non-RF communications with the device.

Abstract: A system determining whether the shielding on a shielded signal or power cable has been compromised without the need of detaching the cable. A special-made cable is used with a dedicated shielding surveillance conductor and a process for injecting a known current on the shield of the cable and monitoring a voltage on the shielding surveillance conductor.

Abstract: An embodiment disclosed herein is directed to a method of monitoring an electromagnetic shield effectiveness including transmitting a first electromagnetic field toward a first surface of an electromagnetic shield, detecting a second electromagnetic field transmitted from a second surface of the electromagnetic shield, generating a first signal corresponding to the second electromagnetic field and determining whether a defect exists at the electromagnetic shield by comparing the first signal to a predetermined threshold.

Abstract: An arrangement for measuring the effectiveness of a shielding material against electromagnetic fields. The arrangement includes a first and a second reverberation chamber sharing a common wall. The common wall is partly made of the shielding material. A first antenna is arranged in the first reverberation chamber. The first antenna transmits an electromagnetic field. The electromagnetic field goes through the shielding material to enter the second reverberation chamber. A second antenna arranged in the second reverberation chamber receives the electromagnetic field. The second reverberation chamber includes at least one deformable wall, so as to mix the electromagnetic field before it is received by the second antenna.

Abstract: An apparatus for testing a semiconductor device having an RF shield has a shield box. A test board is positioned in an interior of the shield box. A first surface of the test board has an area for attaching the semiconductor device. A shield device is attached to a second surface of the test board and beneath the area for attaching the semiconductor device. An antenna is positioned in the interior of the shield box and above the area for attaching the semiconductor device.

Abstract: A method and apparatus for improving yield ratio of testing are disclosed. The method includes the following steps. First of all, devices are tested and electromagnetic interference is measured. Next, the test results are examined for whether the devices pass the test or not. Then, electromagnetic interference data are examined for whether the electromagnetic interference data are over a predetermined standard if the devices fail the test. The above-mentioned steps are performed again if the electromagnetic interference data are over a predetermined standard. The test is terminated if the devices still fail the test and the values of electromagnetic interference are still over a predetermined standard.

Abstract: A junction-current probe is provided which can measure a current flowing in a junction port adapted to connect a circuit board or an electronic apparatus to a chassis under the condition that the circuit board or electronic apparatus is packaged to the chassis. Structurally, the current probe has a circular or rectangular insulator having a hole in the center, a coiled conductor wire for converting linkage flux into voltage, an insulating member for preventing the insulator from making electrical contact with surroundings, an extraction lead for connecting opposite ends of the conductor wire to a cable and the cable for connection to a measurement unit. The current probe is reduced in thickness within in a range in which the condition of packaging to the chassis can remain unchanged.

Abstract: In an immunity test system of the present invention, a boundary point detection device changes a signal level of a transmission signal input to an antenna through a level adjusting device while monitoring an operation of an electronic equipment, and thereby detects a signal level of the transmission signal at a boundary point, at which the electronic equipment is changed from a normal operation state to an abnormal operation state, or vice versa, due to the test wave; and a test result storing device calculates an electric field strength of the test wave at the boundary point by using conversion data based on the signal level of the transmission signal at the boundary point detected by the boundary point detection device, and stores in a storage device a calculation result of the electric field strength as well as a test condition used for obtaining the electric field strength.

Abstract: A method for evaluating the integrity of a cable shield utilizing wideband noise-to-ground measurements is provided. Upon determining that trouble with the cable shield exists, a method s is provided to isolate the location of the trouble with the cable shield. The method utilizes access locations along the cable and therefore does not require opening of the cable shield to isolate the trouble in the shield.

Abstract: A method of determining at least one characteristic parameter of a resonant structure (4) comprising the following steps: firstly placing the resonant structure (4) at a location, said location being located in the far field of a first antenna (2) and in the far field of a second antenna (5), and secondly emitting electromagnetic waves (EEW) with different frequencies in a given frequency range by means of the first antenna (2) such that the emitted electromagnetic waves (EEW) are modified by the resonant structure (4) and modified electromagnetic waves (MEW) are achieved, and thirdly determining during a first determining step a first electric power-value being representative of the power associated with the emitted electromagnetic waves (EEW), and fourthly receiving the generated modified electromagnetic waves (MEW) by means of the second antenna (5) and fifthly determining during a second determining step a second electric power-value being representative of the power associated with the received modified

Abstract: A method for determining attenuation of electromagnetic waves impacting an electromagnetic shield. A reference amplitude is provided. A signal exhibiting a first frequency is converted to a converted signal exhibiting a second frequency higher than the first frequency. Electromagnetic waves corresponding to the converted signal are transmitted from a first antenna toward a second antenna with the electromagnetic shield positioned between them. Attenuated remnants of the electromagnetic waves received by the second antenna are converted to a corresponding signal exhibiting a third frequency that is lower than the second frequency. The amplitude of the corresponding signal is compared to the reference amplitude.

Abstract: An embodiment disclosed herein is directed to a method of monitoring an electromagnetic shield effectiveness comprising transmitting a first electromagnetic field toward a first surface of an electromagnetic shield, detecting a second electromagnetic field transmitted from a second surface of the electromagnetic shield, generating a first signal corresponding to the second electromagnetic field and determining whether a defect exists at the electromagnetic shield by comparing the first signal to a predetermined threshold.

Abstract: A resonance scanning system and method for testing equipment for electromagnetic resonances uses a resonance detection subsystem with at least one probe to identify at least one of a resonating location, a resonating frequency and a quality factor of a resonance of the equipment and an automatic scanning subsystem to displace the probe to different testing locations of the equipment so that the resonance detection subsystem can determine if any of the different testing locations of the equipment exhibits electromagnetic resonances.

Abstract: Issuance of work orders in response to monitoring signal egress from shielding integrity flaws in a cable communication system by detecting received signal strength from a mobile receiver only during rising trends in received signal strength when the mobile receiver is in motion and tracking the maximum received signal strength peak during each rising trend. Rising trends are detected by computing two rolling averages of received signal strength sample of different lengths and offset from each other and applying a threshold to the difference between the rolling averages to provide hysteresis in switching between rising and falling trend detection. Reported peaks are then compared by proximity to each other and their circle of influence determined in accordance with respective signal strengths to determine if newly reported peaks are duplicates of previously reported peaks and duplicate reported peaks are removed or discarded.

Abstract: A method for mini module EMI shielding effectiveness evaluation comprises providing a test vehicle including at least one test platform. The test platform includes at least one mini emitter, a mini receiver with a reference shield, and a mini receiver with a shield under test. EMI shielding effectiveness transmission signals are applied to the at least one mini emitter. Signals received by the mini receiver with a shield under test and the mini receiver with the reference shield are evaluated. The mini emitter, mini receiver with the reference shield, and mini receiver with the shield under test comprise components fabricated concurrently and under fabrication conditions used for fabrication of the test platform of the test vehicle. As used herein, a mini emitter and mini receiver may be interchanged according to the requirements of a given EMI shielding effectiveness evaluation.

Abstract: Electromagnetic compatibility of an information handling system and peripheral for achieving defined electromagnetic interference constraints is tested through a test adapter that interfaces with an external cable connecting the information handling system and peripheral. Signals from the external cable are passed through an isolation resistor and parallel capacitance to compensate for input capacitance of a signal tester. A common mode choke isolates a common mode component of the signal at the external cable. A noise generator applies a signal through the test adapter to the external cable to allow measurement of signals emitted from the peripheral due to injected noise.

Abstract: A method and system for remotely affecting electronics within a conductive enclosure are disclosed. The method can comprise transmitting electromagnetic radiation of two different frequencies to the enclosure. The two different frequencies can be selected such that they penetrate the enclosure and therein form electromagnetic radiation of a third frequency that resonates within the enclosure. The third frequency can interact with the electronics, such as to disrupt operation thereof.

Abstract: The “discrete frequency stir” (DFS) method provides improved mode stir testing of electromagnetic characteristics of an enclosure/cavity. Adequate sampling of the electric field inside the enclosure/cavity is provided by electronic perturbation or “stirring” of the field with a short duration, continuous wave, radiated source where the wave frequency is stepped in small steps across a frequency range of interest. The frequency steps are selected to be at least slightly larger than the resonant mode bandwidth associated with the given enclosure/cavity in order to provide statistically independent measurements. A stirring bandwidth is selected to encompass a statistically significant number of these measurement samples while maintaining adequate frequency resolution. A statistical evaluation of the measured field is then performed over this stirring bandwidth.

Abstract: Systems and methods for evaluating electromagnetic interference that may be employed, for among other things, to evaluate electronic system immunity to radiated electromagnetic fields and/or to identify particular electronic system areas that are susceptible to electromagnetic radiation.

Abstract: An interference exclusion capability testing apparatus is provided for use in testing interference exclusion capability of a specimen by radiating an electromagnetic wave toward the specimen from a radiating antenna. The radiating antenna includes an electromagnetic horn, and a waveguide plate that guides an electromagnetic wave radiated from the electromagnetic horn to the specimen.

Abstract: An embodiment disclosed herein is directed to a method of monitoring an electromagnetic shield effectiveness comprising transmitting a first electromagnetic field toward a first surface of an electromagnetic shield, detecting a second electromagnetic field transmitted from a second surface of the electromagnetic shield, generating a first signal corresponding to the second electromagnetic field and determining whether a defect exists at the electromagnetic shield by comparing the first signal to a predetermined threshold.

Abstract: An apparatus for studying the electromagnetic behavior of an electromagnetic wave-emitting or electromagnetic wave-receiving tool is provided. An anechoic chamber is configured to receive the tool as well as a person handling the tool. At least one analysis antenna is configured to pick-up the electromagnetic waves emitted from or received by the tool. Signals outputted by the analysis antenna are processed, and a radiation diagram associated with the electromagnetic tool is displayed. The radiation diagram is displayed inside the anechoic chamber so that the person handling the electromagnetic tool observes how the handling of the tool affects its electromagnetic behavior.

Abstract: A cable testing device of the present invention can test sheltering performance of a cable which has a central wire, a shelter wrapped around the central wire and an exterior cover wrapped around the shelter. One end of the central wire and two ends of the shelter are earthed. The cable testing device includes a network testing device and a metal tube. The network testing device has an input which is connected to the other end of the cable and an output. The metal tube incloses the cable to be tested, one end of the metal tube is connected to the output of the network testing device, the other end is earthed. As a result, an electromagnetic field is formed in the interior of metal tube, thereby, the sheltering performance of the shelter of the cable can be tested directly before the whole cable product being assembled.

Abstract: An embodiment disclosed herein is directed to an electromagnetic shielding defect monitoring system that includes a transmit system adapted to transmit a first electromagnetic field toward a first surface of an electromagnetically shielded enclosure, thereby generating a first current on the first surface, a stationary receive system adapted to detect a second electromagnetic field transmitted from a second surface of the electromagnetically shielded enclosure by a second current induced on the second surface by the first current and to generate a corresponding detected signal; control circuitry adapted to control operations of the transmit and receive systems; and analysis circuitry adapted to identify a location of a defect in the electromagnetically shielded enclosure based upon operations of the transmit and receive systems and based upon the detected signal.

Abstract: A guarded sense impedance for use in a measurement instrument includes a sense impedance adapted to have a spatially distributed electrical potential and at least one guard structure adapted to have the spatially distributed electrical potential. The guard structure is arranged to provide a spatially distributed guard potential for the sense impedance.

Abstract: A membrane probing assembly includes a probe card with conductors supported thereon, wherein the conductors include at least a signal conductor located between a pair of spaced apart guard conductors. A membrane assembly includes a membrane with contacts thereon, and supporting at least a signal conductor located between a pair of spaced apart guard conductors. The guard conductors of the probe card are electrically interconnected proximate the interconnection between the probe card and the membrane assembly. The guard conductors of the membrane assembly are electrically interconnected proximate the interconnection between the probe card and the membrane assembly.

Abstract: Electromagnetic compatibility of an information handling system and peripheral for achieving defined electromagnetic interference constraints is tested through a test adapter that interfaces with an external cable connecting the information handling system and peripheral. Signals from the external cable are passed through an isolation resistor and parallel capacitance to compensate for input capacitance of a signal tester. A common mode choke isolates a common mode component of the signal at the external cable. A noise generator applies a signal through the test adapter to the external cable to allow measurement of signals emitted from the peripheral due to injected noise.

Abstract: An embodiment disclosed herein is directed to an electromagnetic shielding defect monitoring system that includes a transmit system adapted to transmit a first electromagnetic field toward a first surface of an electromagnetically shielded enclosure, thereby generating a first current on the first surface, a stationary receive system adapted to detect a second electromagnetic field transmitted from a second surface of the electromagnetically shielded enclosure by a second current induced on the second surface by the first current and to generate a corresponding detected signal; control circuitry adapted to control operations of the transmit and receive systems; and analysis circuitry adapted to identify a location of a defect in the electromagnetically shielded enclosure based upon operations of the transmit and receive systems and based upon the detected signal.

Abstract: A method for measuring electromagnetic radiation pattern and gain of radiator using TEM waveguide is disclosed. The method includes the steps of: a) measuring powers of output port of a transverse electric and magnetic (TEM) waveguide by changing arrangements of the radiator located within the TEM waveguide; and b) estimating a radiation power density of the radiator in free space, wherein the radiator is modeled as a dipole moment based on the powers of the output port of the TEM waveguide.

Abstract: The present invention provides a micro sensor for monitoring the cleaning and drying processes for very high aspect ratio micro channels in dielectric films oriented parallel to the fluid-solid interface during the manufacture of ICs, MEMS and other micro-devices. The micro sensor can be used to monitor “vertical” micro features common in microelectronics fabrication or “horizontal” micro features found in MEMS or microfluidic fabrication. By forming the micro channels parallel to the interface, the channels can be made with much higher and well controlled aspect ratios. In addition, multiple sensors can sense the impedance at various points along the micro features. The addition of a guard reduces the effects of any parasitic capacitance, which extends the measurement bandwidth of the sensor.

Abstract: A system for testing radio frequency (RF) communications of a device capable of such communications is provided. The system includes a chamber for isolating the device from RF interference, an antenna that is suitable for RF communications with the device wherein the antenna is capable of communications over a range of frequencies, the antenna being located within the chamber, and a digital communication link for providing non-RF communications with the device.

Abstract: The micro sensor is fabricated with a guard that shields the electrodes from the surrounding environment, thereby reducing loss of measurement signal through the parasitic capacitances to the substrate and fluid. The guards are low impedance points in the circuit that are biased to track as closely as possible the ac voltages of the respective electrodes. Each guard is suitably connected to the output of a guard buffer that supplies the current required to ensure that the guard is at all times at nearly the same voltage as the electrode it is guarding. The micro sensor has an improved signal to noise ratio (SNR) over an extended measurement frequency range (bandwidth) for monitoring in-situ the cleaning and drying processes for high aspect ratio micro features in dielectric films oriented perpendicular to the fluid-solid interface during the manufacture of ICs, MEMS and other micro-devices.

Abstract: To reduce noise in measurements obtained by probing a device supported on surface of a thermal chuck in a probe station, a conductive member is arranged to intercept current coupling the thermal unit of the chuck to the surface supporting the device. The conductive member is capacitively coupled to the thermal unit but free of direct electrical connection thereto.

Abstract: A galvanically isolated signal conditioning system includes a signal conditioning circuit on an integrated circuit chip; a flying capacitor; and a galvanically isolating MEMS switching device on an integrated circuit chip for selectively switching the flying capacitor from across a pair of input terminals in one state to across the input terminals of the signal conditioning circuit in another state.

Abstract: As the length of a cylinder of a magnetically shielding apparatus is shorter, the amount of magnetism of a component perpendicular to an axis of the cylinder which enters the opening portion of the cylinder is larger, resulting in a lower magnetic shield effect. A second magnetically shielding apparatus is formed in a cylinder with both ends or one direction close to an object to be measured being opened, and is disposed within a first magnetically shielding apparatus. An axial direction of the cylinder is substantially parallel to the magnetic flux density detection direction. The magnetic sensor, which conducts magnetic signal measurement and is disposed within the cylinder, is in the first magnetically shielding apparatus formed in a cylinder having both open ends, to thereby shield a magnetic flux density component that cannot be shielded by the first magnetically shielding apparatus by the periphery of the magnetic sensor.

Abstract: Systems and methods for evaluating electromagnetic interference that may be employed, for among other things, to evaluate electronic system immunity to radiated electromagnetic fields and/or to identify particular electronic system areas that are susceptible to electromagnetic radiation.

Abstract: At least one exemplary embodiment of the present invention includes a capacitive sensing system, comprising a sensing conductor coupleable to a grounded target by a gap capacitance Cd, said grounded target separated from said sensing conductor by a gap having a width. The capacitive sensing system also comprises a circuit connected to said sensing conductor, an input signal having an input frequency fosc provided to said circuit through an input resistance Rd, an output signal of said circuit having an output voltage varying linearly with the width of the gap when the impedance of the gap capacitance 1/(2?foscCd) approaches or exceeds the input resistance Rd.

Abstract: A system for shielding an engine component of an equipment service vehicle including an enclosure, wherein the enclosure includes a surface having a plurality of apertures formed in the surface of the enclosure, the plurality of apertures being dimensioned to minimize electromagnetic emissions from the engine component of the equipment service vehicle.

Abstract: Determining the RF shielding effectiveness of a shielding structure including measuring RF isolation between a first and a second element of a directional coupler and providing a first measurement result, placing a shielding structure so that a part of the shielding structure is substantially between the first element and the second element of the directional coupler, measuring RF isolation between the first element and the second element of the directional coupler RF and providing a second measurement result, and determining the shielding effectiveness of the shielding structure based at least in part on the first and the second measurement result.

Abstract: Provided is an apparatus for measuring a read range between a tag and a reader, which includes an electromagnetic anechoic chamber formed by connecting at least one unit cell in a row, the unit cell having an electromagnetic wave absorbent provided on an inner wall of each unit cell, an electromagnetic generation portion located at the unit cell at an end of the electromagnetic anechoic chamber and transmitting an electromagnetic wave through an antenna, and an electromagnetic measurement portion which measures a field strength of the electromagnetic wave transmitted from the electromagnetic generation portion using an electric field probe moving in the electromagnetic anechoic chamber.

Abstract: A membrane probing assembly includes a probe card with conductors supported thereon, wherein the conductors include at least a signal conductor located between a pair of spaced apart guard conductors. A membrane assembly includes a membrane with contacts thereon, and supporting at least a signal conductor located between a pair of spaced apart guard conductors. The guard conductors of the probe card are electrically interconnected proximate the interconnection between the probe card and the membrane assembly. The guard conductors of the membrane assembly are electrically interconnected proximate the interconnection between the probe card and the membrane assembly.

Abstract: A coated electric wire is wound around a detection circuit in a planar manner for the purpose of electrostatic shield. This winding is performed, for example, spirally in a single layer. In the case where there are further provided a detection circuit board including a detection circuit and a cylindrical case, the coated electric wire is wound around the detection circuit board in a planar manner, wherein the direction of the axis of the cylindrical surface accords with the direction of the axis of the case. Consequently, there can be provided a sensor device in which the detection circuit can be electrostatically shielded with ease.