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 |
20100270967 | APPARATUS FOR HARVESTING ENERGY FROM MICROWAVE - Provided is an apparatus for harvesting energy from a microwave. An apparatus for harvesting energy from a microwave in an electricity storage system of a building, includes: a plurality of rectennas arranged with a predetermined length according to characteristic of microwave to be absorbed, and configured to collect microwave in the atmosphere and convert the collected microwave into electric energy; a current converter configured to convert the electric energy outputted from the rectennas into a storable current; and a charging tank configured to store the current outputted from the current converter, wherein the arranged rectennas are attached to an outer wall of the building, and the rectennas attached to the top of the building are printed in a transparent conductor on the surface of a solar cell. | 10-28-2010 |
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 |
20110152553 | CARBON NANOTUBE COMPOSITE AND PREPARATION METHOD OF THE SAME - A carbon nanotube (CNT) composite of which one or more specific functional groups are bonded to surface of a CNT, and a method of preparing a CNT composite are provided. The method includes the steps of introducing an acylhalide group to surface of a CNT, and causing a reaction of the acylhalide group with a polysiloxane having amine groups so as to prepare a CNT composite of which the polysiloxane is bonded to the surface by the medium of an amide group. The CNT composite can fix metal particles uniformly and densely thereon, can have improved mechanical and electrical properties, and can be applied to various industrial fields. | 06-23-2011 |
20120161894 | POWER DISTRIBUTION NETWORK FOR ENHANCING SIGNAL QUALITY - A power distribution network includes a reference plane placed under a signal line, the reference plane having a discontinuous structure; and a return current path for the signal line, the return current path being formed on the reference plane. The return current path has any one shape among the same shape as the signal line, a proportional shape to the signal line and an expansion shape of the signal line. | 06-28-2012 |
20130006553 | APPARATUS AND METHOD FOR GENERATING ANALYSIS ALGORITHM OF ELECTROMAGNETIC FIELD GENERATOR - 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. | 01-03-2013 |
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 |