64results about "Shielding efficiency measurement" patented technology

A radar absorbing composite includes a (CNT)-infused fiber material disposed in at least a portion of a matrix material. The composite absorbs radar in a frequency range from about 0.10 Megahertz to about 60 Gigahertz. The CNT-infused fiber material forms a first layer that reduces radar reflectance and a second layer that dissipates the energy of the radar. A method of manufacturing this composite includes disposing a CNT-infused fiber material in a portion of a matrix material with a controlled orientation of the CNT-infused fiber material within the matrix material, and curing the matrix material. The composite can be formed into a panel which is adaptable as a structural component of a transport vessel or missile for use in stealth applications.

An ESD protection device is manufactured such that its ESD characteristics are easily adjusted and stabilized. The ESD protection device includes an insulating substrate, a cavity provided in the insulating substrate, at least one pair of discharge electrodes each including a portion exposed in the cavity, the exposed portions being arranged to face each other, and external electrodes provided on a surface of the insulating substrate and connected to the at least one pair of discharge electrodes. A particulate supporting electrode material having conductivity is dispersed between the exposed portions of the at least one pair of discharge electrodes in the cavity

An Electronic Isolation Chamber With Unimpeded Hand Entry is disclosed. The somewhat “open” appearance of the Electromagnetic Isolation Chamber goes contrary to teachings in the art of RF shielding and enclosures. A sleeve through an aperture in the chamber is worn by an operator, and with the placement of an operator's arm there through, the electromagnetic shielding is completed and the volume contained within the chamber is electromagnetically isolated from the environment exterior to the chamber. This novel arrangement allows an operator to work with bare hands, thus providing more tactile interaction with a device under test and also reducing the tendency for shorting that is present when wearing conductive gloves. A shielded window and an interior light may be included to facilitate viewing of a device within the chamber during operation of the device. The chamber provides an inexpensive, fully shielded environment for the testing, tuning, adjusting, or repair of RF transmitting or receiving devices such as computers, wireless devices, cellular telephones, and the like.

An objective of the present invention is to form a hyper-elastic flange integrally within a shield case body around a periphery thereof while decreasing an occupied area for grounding. The shield case 2 according to the present invention is disposed to cover electronic parts 6 on a circuit board 1, and which has a flange 7 formed integrally therewith so as to contact with a metallic ground line 3 on the circuit board 1. The flange 7 is elastically deformed to be grounded, thus a leakage of electromagnetic waves to the outside of the shield case 2 is prevented. The flange 7 is made of metallic glass. By forming the flange 7 from metallic glass, a displacement due to viscous flowing on the atomic level, which is different from a plastic deformation, can be utilized, and thus a high precision flange can be formed without a spring-back.

The design of an electro-magnetic radiation suppression shield and cooling housing for a computer, server or other electronic device having a computer processor may be greatly enhanced and expedited by a test apparatus that permits the placement of electro-magnetic radiation suppression plates at differing locations, spacings and alignments, which allows a variance in positioning the electro-magnetic radiation source. The test apparatus not only has an air flow cooling opening in which an electro-magnetic radiation suppression panel forms cooling air flow holes but also a fixture for disposing a second similar electromagnetic radiation suppression panel at a distance from the first electro-magnetic radiation suppression panel. Each of the panels may be substituted to test various designs. The test apparatus further is provided with a telescoping support projecting into the interior cavity so that the electromagnetic radiation source may be moved about in the interior and thus simulate a large number of positions and conditions. The test apparatus provides a greatly enhanced tool in the trial and error approach to electro-magnetic radiation control.

A noise current passing through a substrate on which an electronic component is mounted is suppressed in a housing, to provide a malfunction of an electronic device. A substrate (103) on which an electronic component is mounted is secured to a housing (102) by a metal spacer (108) and a screw (104). A noise control member (100) mainly composed of an insulation substance is disposed between the metal spacer (108) and the substrate (103). A first conductive film is formed on the metal spacer-side of the noise control member (100), and a second conductive film is formed on the substrate-side of the noise control member (100). A resistance member (101) is disposed between the first conductive film and the second conductive film. A noise current introduced from the housing to the substrate can be suppressed by the resistance member.

An analysis algorithm generation apparatus of an electromagnetic field generator includes: a value inputting unit for receiving information on a TEM cell or GTEM cell; and an algorithm generating unit for generating an algorithm to analyze a TEM mode in a cross sectional structure of the GTEM cell or a tapered section of the TEM cell by using an associated Legendre function and a mode-matching method based on the information transmitted from the value inputting unit. The algorithm generating unit analyzes the TEM mode by dividing a space into four (left, right, upper and lower) regions, the space existing between an inner electrode and an outer wall of the cross sectional structure of the GTEM cell or the tapered section of the TEM cell.

An apparatus for restricting the flow of RF energy when attached to a tester wherein test equipment is positioned within the apparatus, comprising: a lid; a base; hinges for attaching the lid to the base; EMI gasket material for sealing seams; latches for attaching the lid to the base and for applying forces between the lid and the base to provide compression of the EMI gasket material for proper sealing of the seams; a connection point for providing two axis alignment of the base to the tester; and a positioning plate for providing three axis alignment of the test equipment in relation to the tester.

An apparatus and a method for measuring an electric magnetic interference (EMI) level of a radio frequency device is disclosed. The apparatus for measuring a level of electric magnetic interference (EMI) with an electronic device to radiate an electromagnetic wave, the apparatus including: a test device for outputting a signal in response to the electromagnetic wave radiated from the electric device; a calculating unit for calculating a group_delay variation information of the test device by using the signal from the test device; a processor for storing a reference group_delay variation; and an analyzer for analyzing the level of EMI by comparing the reference group_delay variation information and the group_delay variation information.

Both a forward direction and a rearward direction of storage racks 20_-1 and 20_-2 are set to be opening portions 23 and intake and exhaust ducts 61_-1, 61_-2, 62_-1 and 62_-2 are provided on doors 11a and 11b in the forward direction and the rearward direction of a storage container 10. Consequently, a ventilation passage linked to an outside from a wall surface in the forward direction of the storage container 10 via a wall surface in the rearward direction is formed for each of storage shelves 31_-i and 32_-i of the storage racks 20_-1 and 20_-2 so that heat generated from an electronic apparatus can be efficiently discharged to an outside of the storage container 10, and furthermore, the storage container 10 itself is configured to be isolated electrically by a radio wave absorber so that a function of an anechoic chamber can also be ensured.

A shield device for blocking ambient electromagnetic waves from interfering with testing of an electronic product (50) connected with a cable (60), includes a shield cage (10) and a receiving cage (40) for receiving the cable. The shield cage includes a base (30) defining a receiving space (38) for receiving the electronic product, and an opening in communication with the receiving space. The receiving cage received in the opening, includes an upper cover (42) and a lower cover (44). The upper cover defines a recessed portion (422), and the lower cover includes a protrusion (442) received in the recessed portion. When the upper cover is mounted on the lower cover, at least one transition portion (46) is formed in the receiving cage.

A radiofrequency filter utilizing a common mode choke both as a traditional common mode choke as well as the inductance in a low pass filter. Filter topology as well as component selection is optimized for wide band operation. Common mode chokes allow differential currents to pass with little attenuation while common mode currents are effectively presented with an inductance in the common current path. This inductance is used in a low pass filter configuration to present an even higher attenuation to common mode currents. The use of multiple chokes and/or differing core materials contributes to wider band operation without pronounced resonances. The capacitance used in the low pass filter is connected in a way as to reduce its effect on the data signals while still being effective in filtering.

The invention provides a lightweight honeycomb wave-absorbing material and a preparation method thereof. The honeycomb wave-absorbing material is obtained by processing a base material doped with carbon fibers into a honeycomb core structure and then carrying out gum dipping molding, and the base material comprises aramid paper or kraft paper. The preparation method comprises the following steps of 1, preparing the honeycomb core by using a base material doped with carbon fibers, wherein the honeycomb core is directly used or subjected to subsequent processing, 2, carrying out gum dipping molding on the honeycomb core, and 3, drying the honeycomb core subjected to gum dipping molding to obtain the honeycomb wave-absorbing material. According to the honeycomb wave-absorbing material disclosed by the invention, paper containing carbon fibers is used as a raw material, and good wave-absorbing performance can be realized by preparing honeycombs; and the wave-absorbing material has the advantages of being excellent in wave-absorbing performance, good in environment resistance, light in weight, flexible, capable of being molded and the like, and can be used for stealth design of some equipment.

An electromagnetic wave shield box (50) accommodates a DUT (100) having an antenna (110) and a coupling antenna 80 that is spatially coupled to the antenna (110), and includes a coupling antenna holding module (70) that arranges a plurality of the coupling antennas (80) annually so that an antenna surface is directed to a center of a ring, and holds the coupling antennas (80). The coupling antennaholding module (70) holds each coupling antenna (80) in a posture in which the coupling antenna (80) is inclined at, for example, 32 degrees with respect to a horizontal surface so that the respective coupling antennas (80) are able to radiate radio waves toward the same radiation point in upper positions, and is rotated by about 5 degrees around a center axis (C1) in a direction orthogonal to acircumferential direction of the ring of the coupling antenna (80).

The invention provides an electromagnetic shielding cabin and a magnetic resonance system with the same. The electromagnetic shielding cabin comprises a shielding rail, a shielding cover and a shielding door, wherein the shielding cover is arranged on the shielding rail in a sliding manner, and a sliding shielding structure is arranged between the shielding cover and the shielding rail and used for attenuating or shielding electromagnetic waves; a butt joint shielding interface is arranged at the first opening end of the shielding cover and is used for being in shielding connection with a magnetic resonance main body; and the shielding door is rotationally arranged and connected to the second opening end of the shielding cover, and an elastic shielding structure is arranged on the end surface of the second opening end and used for enabling the shielding door to make conductive contact with the shielding cover when the shielding door is closed. According to the invention, the shieldingdoor is matched with the shielding cover to form a shielding cavity, so that a good shielding environment is provided for magnetic resonance, excellent imaging of magnetic resonance is ensured, and areliable basis is provided for treatment.

The invention belongs to the welding field, in particular to an intelligent magnetic shielding device for electron beam welding. The device includes a detection unit, a shield part and a control part,The structure of the shielding cover can be adjusted according to the complexity of the electron beam machining and the intensity of the ambient magnetic field, and the expansion and contraction of the electric ejector rod can be controlled to make the inner and outer silicon steel sheets be nested and combined into a single-layer structure or a multi-layer structure, so as to realize different shielding requirements, thereby ensuring stable track and high welding precision when the electron beam machining is carried out.