Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A reference current bias circuit includes a self-bias circuit configured to provide a bias current to an amplifier; a basic bandgap circuit coupled to inputs of the amplifier; a startup circuit configured to support an initial operation of the amplifier; a temperature compensator configured to include a first mirroring unit for mirroring current according to a positive temperature coefficient characteristic from the basic bandgap circuit; and a second mirroring unit for mirroring current according to a negative temperature coefficient characteristic from the basic bandgap circuit, and to provide a reference current by combining the current of the first mirroring unit and the current of the second mirroring unit; and a reference current mirroring unit configured to generate reference current biases based on the reference current from the temperature compensator.

Abstract: A camera based positioner (CBP) for near-field measurement and a method therefor, and a near-field measurement system are provided. A measurement probe and an antenna under test (AUT) are automatically aligned to a position for near-field antenna measurement by recognizing a position and a rotation angle of the AUT based on an interval and an angle between neighboring laser sources represented in an image taken by emitting laser beams from at least two laser sources located with a predetermined interval and a predetermined angle.

Abstract: Provided is a shaped-beam antenna having a multi-layered conductive element array surrounded by a dielectric ring. The shaped-beam antenna includes: a planar excitation element having a radiation structure according to a required polarization; a multi-layered conductive element array disposed on the planer excitation element, wherein the multi-layered conductive element array is formed by layering conductive elements at an arbitrary interval; and a dielectric ring surrounding the multi-layered conductive element array at a predetermined separation distance therefrom. Accordingly, it is possible to reduce the entire size of the shaped-beam antenna and manufacturing costs thereof.

Abstract: Provided is a small monopole antenna, which can generate a plurality of resonant frequencies, have a high antenna efficiency, and be easily installed. The antenna includes a first antenna element formed of a coaxial cable; a second antenna element sealing the first antenna element and sharing a feed point with the first antenna element; and a feeder cable for feeding electric power to the feed point. This antenna is applied as a small antenna.

Abstract: Provided is a system and method for measuring an antenna radiation pattern in a Fresnel region based on a phi-variation method. The system includes a rotator for changing angles of a reference antenna and a target antenna; a vector network analyzer for obtaining radiation pattern data in accordance with transmission/reception radio frequency (RF) signals between the reference antenna and the target antenna; a measurement unit for calculating a far-field radiation pattern based on the radiation pattern data received from the vector network analyzer; and a controller for controlling the rotator according to a measurement angle transmitted from the measurement unit.

Abstract: Provided is an H-type monopole isolation antenna. The antenna provides an H-type monopole isolation antenna which can gain a high bi-directional transmitting/receiving isolation between a transmitting antenna and a receiving antenna of co-channel/co-polarization by including an antenna symmetrically positioned in right/left sides based on a covering means. A transmitting/receiving isolation antenna for maintaining high isolation between a transmitting signal and a receiving signal includes a cover which includes a conductor; and first and second antennas which are bisymmetrically positioned in right and left parts of the covering means and separately operated as a transmitting antenna or a receiving antenna. The antenna is used in a co-channel bi-direction repeater system.

Abstract: Provided is a loop antenna. The loop antenna includes a first antenna element embodied as a coaxial cable, a second antenna element embodied as a line and connected to one end of the first antenna element in series, a third antenna eLement embodied as a line, having one end connected to a ground plane and the other end connected to the other end of the first antenna element in series, and a power feeding cable for supplying power to the second antenna element.

Abstract: Provided is a small monopole antenna having a loop feeder. The small monopole antenna having a loop feeder includes: a loop element forming a loop along a predetermined plane and having a loop feeder at the center thereof; a non-feeding type monopole antenna element including one end connected to a wire of the loop element and other end connected to a ground unit by being bended at the center of the loop element; a ground unit for grounding other end of the non-feeding type monopole antenna; and a first connecting unit for connecting the non-feeding type monopole antenna to an external device for feeding the loop feeder of the loop element through the non-feeding type monopole antenna.

Abstract: Provided is a transmitting/receiving isolation antenna that can perform wireless bi-directional communication in the co-channel, co-polarization and co-time by acquiring high isolation from transmitting and receiving antennas having co-time, co-channel and co-polarization and set up adjacently. The isolation antenna includes a first antenna; second and third antennas symmetrically positioned in the same distance from the first antenna; a shielding unit symmetrically positioned between the first and second antennas, and between the first and third antennas; and a signal removing unit for removing a signal transmitted from the first antenna to the second and third antennas.

Abstract: A planar inverted F antenna having a radiation patch having an asymmetric shape of linearly-tapered rectangle with a plurality of corrugated hollows is disclosed. The planar inverted F antenna having a radiation patch, includes: a first radiation patch for radiating a signal; a ground plate for grounding the first radiation patch; a feeding line for supplying an electric power to the first radiation patch; a short plate having one side coupled to the first radiation patch and other side coupled to the ground plate for shorting the first radiation patch, wherein the first radiation patch having an asymmetrical shape of linearly tapered rectangle and has one or more corrugated hollows.

Abstract: Provided is an isolation antenna for a repeater which can acquire high isolation by using loop and dipole antennas, which are positioned in opposite directions to each other based on a shielding means, in a unidirectional repeater generally used in broadcasting or wireless communications even though transmitting antenna/receiving antennas having a co-channel are set up closely to each other. The transmitting/receiving isolation antenna includes: a shielding means including an electric conductor; a first antenna of a dipole antenna type in one side of the shielding means; and a second antenna of a loop antenna type in an opposite side of the shielding means where the first antenna is positioned.

Abstract: There is a provided a system for measuring an antenna radiation pattern in a Fresnel region, including: a fixed antenna and a movable antenna located in the Fresnel region to acquire a far-field radiation pattern; a moving unit for moving upward or downward to adjust a measuring angle of the movable antenna; a rotation unit to rotate a rotation shaft horizontally; a vector network analyzing unit for outputting an radio frequency (RF) signal to one of the fixed antenna and the movable antenna as a transmission antenna, receiving the RF signal received through the other one of the fixed antenna and the movable antenna as a receiving antenna, and detecting a complex value; a control and communication unit for controlling the vector network analyzing unit and a control unit, and performing a data communication; and the control unit for providing a vertical/horizontal rotation force to the moving unit and the rotation unit under a control of the control and communication unit.

Abstract: Provided are an antenna using an inductively coupled feeding method, a Radio Frequency Identification (RFID) tag thereof, and an antenna impedance matching method thereof. The antenna includes a resonator for determining a resonance frequency of the antenna and a feeder for providing an RF signal to an element connected to the antenna. An RFID tag includes an antenna which receives an RF signal from the RFID reader, an RF front-end which rectifies and detects the RF signal, and a signal processor which is connected to the RF front-end. Particularly, the antenna includes a resonator for determining a resonance frequency of an antenna and a feeder for providing the RF signal to the RF front-end, wherein mutual inductive coupling between the resonator and the feeder is performed.

Abstract: Provided is a system and method for semi-automatically processing a human body image. A segmentation unit segments portions having correlations with one another in a human body image using at least one of image processing functions. A feedback unit performs at least one of the image processing functions on the segmented human body image to improve accuracy of the segmented human body image. A classification unit applies corresponding colors to tissues of the segmented human body image, incorporates the segmented human body image into one image, and creates an image in which classification is completed. A display unit shows images that are results of processing by the segmentation unit, the feedback unit, and the classification unit on independent screen windows.

Abstract: The inverted L antenna with fixed polarization is disclosed. The inverted L antenna with fixed polarization includes: a printed circuit board (PCB) including an metal layer, a dielectric layer and a ground layer; and an antenna element coupled to a predetermined shaped of one side of the PCB, wherein the predetermined shape is a form for directing an electric field excited at edge of PCB to match with a direction of the antenna element.

Abstract: Provided is a planar inverted-F antenna (PIFA) which has a Co-Planar Waveguide (CPW) feeding structure and can be attached to a metal surface, and an RFID tag using the same. The PIFA includes a radiation patch layer; a Co-Planar Waveguide (CPW) feeding layer; a feeding probe; and a short-circuit. The CPW feeding layer includes a feeding means and a ground surface. The feeding probe electrically connects the radiation patch layer and the feeding means and provides a Radio Frequency (RF) signal to be radiated to the radiation patch layer. The short-circuiting means short-circuits the radiation patch layer and the ground surface through the dielectric layer. The PIFA can be applied to a passive RFID tag. Impedance matching between the antenna and the RFID chip is possible. Also, the PIFA can easily control resonant frequency of the antenna and reactance.

Abstract: Provided is a method for measuring inverse scattering wave, which includes installing a scattering object which is a test object in a coupler, feeding an electrical signal to an input terminal of the coupler, terminating an output terminal and an isolation terminal of the coupler so that the electrical signal scattered by colliding with the scattering object is transmitted to a coupling terminal of the coupler, and measuring intensity of the electrical signal transmitted to the coupling terminal. In addition, provided is an apparatus for identifying an inferior Radio Frequency IDentification (RFID) transponder and an inferior RFID reader by using the method for measuring the inverse scattering wave. Accordingly, the installation cost thereof is reduced. Furthermore, the facilities for the measurement can be installed in a narrow space, and the measurement can be done regardless of an external electromagnetic wave environment.