Patent application number | Description | Published |
20090147428 | METAL CASE AND UNIT CELL FOR PREVENTING ELECTROSTATIC DISCHARGE AND METHOD OF FORMING THE SAME - A metal case for preventing electrostatic discharge includes an electromagnetic bandgap restricting current generated by electrostatic discharge and formed by arrangement of unit cells. Further, a method of forming a metal case preventing an electrostatic discharge includes forming an electromagnetic bandgap by arranging a plurality of unit cells; and forming a metal case having the electromagnetic bandgap to restrict current generated by the electrostatic discharge. | 06-11-2009 |
20090201212 | Antenna system having electromagnetic bandgap - An antenna system includes an antenna transmitting and receiving a signal; a power feeding line feeding electric power to the antenna; and a metal conductor ground electrically connected to the power feeding line. Further, the metal conductor ground includes an electromagnetic bandgap. | 08-13-2009 |
20090237323 | Apparatus and method for reducing electromagnetic waves - An apparatus for reducing electromagnetic waves, includes an electromagnetic bandgap for reducing a surface current induced by electromagnetic waves that are emitted from a radiator; and an absorber for reducing a surface current around the electromagnetic bandgap and for diminishing diffracted waves radiated from an end of a terminal. | 09-24-2009 |
20090284404 | ELECTROMAGNETIC WAVE ABSORBER USING RESISTIVE MATERIAL - An electromagnetic wave absorber includes a ground layer made of a metal conductor, a dielectric layer formed on the ground layer, and a unit cell pattern made of a resistive material, and formed on the dielectric layer. The unit cell pattern includes a fundamental patch having a regular square shape, in which a rectangular recess is formed on the center of each of the respective sides, the fundamental patch being located at the center of each of the unit cell pattern, and half cross dipole patches, which are respectively disposed at the four sides of the fundamental patch at a regular angle so as to be engaged with the recesses formed on the respective sides of the fundamental patch at a regular interval. | 11-19-2009 |
20100019988 | FREQUENCY SELECTIVE SURFACE STRUCTURE FOR FILTERING OF SINGLE FREQUENCY BAND - There is provided provided a frequency selective surface (FSS) structure for filtering a single frequency band, including: a plurality of unit cells arranged at a predetermined distance, wherein each of the unit cells includes: a substrate; a circular loop formed on the substrate with a predetermined width and having at least one of meanderingly bent portions, wherein a filtering frequency band is controlled by a length of the circular loop, a width of the circular loop, a distance between the unit cells, and a thickness and dielectric constant of dielectric. | 01-28-2010 |
20100156523 | ARRANGEMENT STRUCTURE OF ELECTROMAGNETIC BAND-GAP FOR SUPPRESSING NOISE AND IMPROVING SIGNAL INTEGRITY - An electromagnetic-wave suppression structure in a multilayer PCB or package structure is supplied with a power to be used therein by a power distribution network including a power plane and a ground plane. The multilayer PCB and package includes: an electromagnetic-wave suppression structure including an electromagnetic band-gap; and the electromagnetic-wave suppression structure is formed at a specific portion(s) of the power plane and/or the ground plane to suppress noises. | 06-24-2010 |
20100156695 | ELECTROMAGNETIC ABSORBER USING RESISTIVE MATERIAL - An electromagnetic absorber using resistive material includes a ground plane of a conductive material; a dielectric layer formed on the ground plane; and a pattern layer in which specific unit cell patterns made of a resistive material are periodically arranged on the dielectric layer. The electromagnetic absorber is applied to an electronic toll collection system, a transportation device, a building structure, an electronic device and an anechoic chamber. | 06-24-2010 |
20100156739 | APPARATUS FOR REDUCING ELECTROMAGNETIC WAVES AND METHOD THEREOF - An apparatus for reducing electromagnetic waves includes a dielectric layer and a plurality of metal unit cells periodically formed over the dielectric layer. The apparatus further includes an adhesive formed under the dielectric layer for attaching the apparatus to a radiator radiating electromagnetic waves. | 06-24-2010 |
20110133978 | MULTI-DIRECTIONAL RESONANT-TYPE ELECTROMAGNETIC WAVE ABSORBER, METHOD FOR ADJUSTING ELECTROMAGNETIC WAVE ABSORPTION PERFORMANCE USING THE SAME AND MANUFACTURING METHOD OF THE SAME - A multi-directional resonant-type electromagnetic wave absorber includes: at least one ground layer; a first dielectric layer and a second dielectric layer respectively formed on different outer surfaces of the ground layer; a first resistive pattern layer formed on an outer surface of the first dielectric layer; and a second resistive pattern layer formed on an outer surface of the second dielectric layer. Herein, the electromagnetic absorption performance is adjusted by changing one or more of thicknesses, permittivities, and permeabilities of the dielectric layers, thicknesses of the resistive pattern layers, and a reflection coefficient of the ground layer. | 06-09-2011 |
20110147063 | MULTILAYER BOARD FOR SUPPRESSING UNWANTED ELECTROMAGNETIC WAVES AND NOISE - A multilayer board for suppressing unwanted electromagnetic waves and noise includes: a power plane and a ground plane constituting a power distribution network; an electromagnetic wave suppression structure placed on the power plane or the ground plane; and a decoupling capacitor placed on the power plane or the ground plane, wherein the electromagnetic wave suppression structure and the decoupling capacitor are placed together. | 06-23-2011 |
20110148738 | OPENING/CLOSING TYPE ELECTROMAGNETIC WAVE ABSORBING DEVICE - An opening/closing type electromagnetic wave absorbing device is provided. The opening/closing type electromagnetic wave absorbing device includes, a plurality of electromagnetic band gap (EBG) unit cells each of which is polygonal and selectively transmits or reflects a wave with a predetermined frequency and an opening/closing means on which the plurality of EBG unit cells are periodically arranged to selectively open and close a limited space, wherein each of the plurality of EBG unit cells includes a metallic conductive ground layer; a dielectric layer formed on the metallic conductive ground layer; an EBG unit cell pattern layer formed of a resistive material on the dielectric layer. | 06-23-2011 |
20120162001 | ELECTROMAGNETIC WAVE REVERBERATION CHAMBER - An electromagnetic wave reverberation chamber includes: an electromagnetic wave absorbing apparatus installed in an intended space of the electromagnetic wave reverberation chamber for adjusting a reflection characteristic of an inside of the electromagnetic wave reverberation chamber, wherein the electromagnetic wave absorbing apparatus have an electromagnetic bandgap structure including a plurality of unit cells arranged periodically. | 06-28-2012 |
20130050006 | ELECTROMAGNETIC WAVE REVERBERATION CHAMBER - An electromagnetic wave reverberation chamber formed in the shape of a polyhedron includes an electromagnetic wave absorbing apparatus installed on at least one wall of metal conductors of the electromagnetic wave reverberation chamber. The electromagnetic wave absorbing apparatus having a shape of a roll screen and includes an electromagnetic wave absorbing film, a roll for rolling the one end of the electromagnetic wave absorbing film, a cover for covering the roll, and a fixing unit for fixing the other end of the electromagnetic wave absorbing film. | 02-28-2013 |
20130059550 | APPARATUS AND METHOD FOR BODY PROTECTION FROM ELECTROMAGNETIC FIELDS - An apparatus for use in a communication device with an antenna protects a body from electromagnetic fields. The apparatus includes a sensing unit to sense a surrounding environment of the communication device, a variable element to perform a variable operation according to a voltage or current applied thereto. The apparatus further includes a variable element control unit to control the voltage or current according to the surrounding environment sensed by the sensing unit to cause the variable element to perform the variable operation, and an intelligent periodic structure coupled with the variable element, the intelligent periodic structure being configured to change an operation frequency of the wireless communication device according to the variable operation of the variable element and adjust a radiation pattern direction of the antenna. | 03-07-2013 |
20130088408 | TRANSPARENT FILM FOR REDUCING ELECTROMAGNETIC WAVES AND METHOD OF MANUFACTURING THE SAME - A method of manufacturing a transparent film for reducing electromagnetic waves includes forming a first dielectric layer and forming a pattern layer on the first dielectric layer. The pattern layer is made of a transparent electrode material having surface resistance. | 04-11-2013 |
20130154751 | VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator includes a split ring resonator (SRR) configured to have meta-material characteristics fabricated on a board, and an energy compensation circuit configured to cause resonant oscillation of the SRR. The energy compensation circuit is fabricated in the form of an integrated circuit. | 06-20-2013 |
20130277579 | DEVICE FOR ABSORBING ELECTROMAGNETIC WAVES - An electromagnetic wave absorbing device includes a ground layer formed of a metal conductor layer, a dielectric layer formed on the ground layer, and a unit cell pattern layer which is formed on the dielectric layer and made of resistive materials, wherein at least two electromagnetic bandgap-based unit cell patterns are periodically arranged on the unit cell pattern layer. | 10-24-2013 |
20140152489 | HIGH-FREQUENCY OCEAN SURFACE RADAR USING FREQUENCY MULTIPLEXING AND ORTHOGONAL WAVEFORMS - A method of reusing a frequency by allocating two orthogonal signal waveforms to the same frequency band is as follows. Two high-frequency ocean surface radars can be operated in the same frequency band without mutual interference by allocating a signal having an up-chirped LFM waveform and a signal having a down-chirped LFM waveform, having the same frequency band, to the two radars by employing an orthogonal characteristic between the two signals. Furthermore, a plurality of radars located within a distance within which interference is possible can be operated without mutual interference by combining and allocating two orthogonal signals and a plurality of frequency bands. | 06-05-2014 |