Patent application number | Description | Published |
20090146197 | PHOTO-DETECTOR ARRAY DEVICE WITH ROIC MONOLITHICALLY INTEGRATED FOR LASER-RADAR IMAGE SIGNAL AND MANUFACTURING METHOD THEREOF - A photo-detector array device integrated with a read-out integrated circuit (ROIC) monolithically integrated for a laser-radar image signal and a manufacturing method thereof are provided. According to the photo-detector array device, a photodiode and control devices for selecting and outputting a laser-radar image signal are simultaneously formed on an InP substrate, so that it is possible to simplify manufacturing processes and to greatly increasing yield. In addition, after the photodiode and the control devices are simultaneously formed on the InP substrate, the photodiode and the control devices are electrically speared from each other by using a polyimide. Therefore, a PN junction surface of the photodiode is buried, so that a surface leakage current can be reduced and an electrical reliability can be improved. In addition, a structure of the control devices can be simplified, so that image signal reception characteristics can be improved. | 06-11-2009 |
20100140662 | OPTICAL RECEIVER AND METHOD OF FORMING THE SAME - Provided are an optical receiver and a method of forming the same. The optical receiver includes a lens, a photo detector, and a hetero-junction bipolar transistor. The lens is attached to a backside of a substrate. The photo detector is disposed on a top surface of the substrate. The hetero-junction bipolar transistor is disposed on the top surface of the substrate. The lens condenses an incident optical signal to transmit the condensed optical signal to the photo detector. | 06-10-2010 |
20100173443 | METHOD OF MANUFACTURING A PHOTO-DETECTOR ARRAY DEVICE WITH ROIC MONOLITHICALLY INTEGRATED FOR LASER-RADAR IMAGE SIGNAL - A method of manufacturing a photo-detector array device integrated with a read-out integrated circuit (ROIC) monolithically integrated for a laser-radar image signal. A detector array device, a photodiode and control devices for selecting and outputting a laser-radar image signal are simultaneously formed on an InP substrate. In addition, after the photodiode and the control devices are simultaneously formed on the InP substrate, the photodiode and the control devices are electrically separated from each other using a polyamide, whereby a PN junction surface of the photodiode is buried to reduce surface leakage current and improve electrical reliability, and the structure of the control devices can be simplified to improve image signal reception characteristics. | 07-08-2010 |
20110241798 | RESONATOR FOR COMMUNICATION SYSTEM AND FILTER USING THE SAME - Provided are a resonator and a filter performing a filtering operation by using the resonator. The filter includes a first resonation unit connected in series to an input terminal and having a first resonant frequency, a filtering unit connected in series to the first resonation unit to filter a signal inputted through the input terminal, a second resonation unit connected in series between the filtering unit and an output terminal and having a second resonant frequency, a first zero-order resonation unit connected in parallel to a connection terminal between the input terminal and the first resonation unit and having a first zero-order resonant frequency equal to the first resonant frequency, and a second zero-order resonation unit connected in parallel to a connection terminal between the output terminal and the second resonation unit and having a second zero-order resonant frequency equal to the second resonant frequency. | 10-06-2011 |
20130003789 | WIRELESS COMMUNICATION METHOD AND APPARATUS USING ADAPTIVE TRANSMISSION POLARIZATION CONTROL - A wireless communication method and apparatus using adaptive transmission polarization control are provided. The wireless communication apparatus includes an orthogonal polarization antenna, a channel state estimator, and a transmission polarization state (TPS) selector. The orthogonal polarization antenna receives at least one reference signal. The channel state estimator estimates a wireless polarization channel on the basis of the reference signal. The TPS selector selects a TPS corresponding to the estimated wireless polarization channel from among a plurality of predefined TPSs, and feeds back the selected TPS information. Accordingly, the wireless communication apparatus feeds back information for polarization control using minimum uplink wireless resources, and maximizes a transmission capacity on the basis of the feedback information. | 01-03-2013 |
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 |
20130293318 | BANDPASS FILTER OF RF COMMUNICATION SYSTEM - The present invention relates to the bandpass filter of an RF communication system. The bandpass filter embodies a dual band characteristic by combining an equilibrium zero-order resonator and a non-equilibrium zero-order resonator, provides transmission zero using a cross-coupling structure near a pass band, and also has a neighboring signal blocking characteristic. | 11-07-2013 |
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 |
20140257779 | METHOD AND APPARATUS FOR TRACING RAY PATH BY USING THREE-DIMENSIONAL MODELING STRUCTURE - A ray path tracing method using a three-dimensional (3D) modeling structure, includes: generating and developing a 3D modeling structure of a glass window and a window frame; setting a ray transmitting point and a ray receiving point at respective positions, and generating a ray from the transmitting point; and forming a path of a transmitted wave ray, passing through the glass window and analyzing a propagation characteristic of the transmitted wave ray. | 09-11-2014 |
20140287706 | APPARATUS AND METHOD FOR DETERMINING RECEIVED SIGNAL LEVEL IN RAY-TRACING WAVE PROPAGATION ENVIRONMENT - An apparatus for determining a received signal level of a radio wave in a ray-tracing wave propagation environment includes a reception unit configured to receive the radio wave; and an analyzing unit configured to determine the received signal level of the radio wave in the ray-tracing wave propagation environment. Further, the analyzing unit is configured to analyze a correlation of the height and altitude of a surface roughness that recognizes the surface of a surrounding obstacle depending on the length of wavelength in the course of delivery of a received signal of the radio wave and analyze precisely the scattering of the received signal depending on the surface roughness to determine the received signal level of the radio wave when determining the received signal level. | 09-25-2014 |
20140349693 | METHOD OF PROVIDING MILLIMETER WAVE BAND-BASED COMMUNICATION CONNECTION SERVICE - A method of providing millimeter wave band-based communication connection service, includes measuring a strength of a signal received from at least one base station that forms at least one cell; and storing signal data based on the measured strength of the signal so that the signal data is mapped to the at least one base station. Further, the method includes selecting any one base station from among the at least one base station based on the stored signal data; and connecting communication to the selected base station. Further, the method is performed on a millimeter wave band-based mobile communication terminal. | 11-27-2014 |
20150061784 | BACKWARD-WAVE OSCILLATOR IN COMMUNICATION SYSTEM - Provided is a backward-wave oscillator in a communication system, including a waveguide formed of a metamaterial. A unit structure of the waveguide may include: a top plate; a short-circuited stub; a bottom plate separated at a predetermined gap from the top plate, and having the short-circuited stub formed in the center thereof; a first metal pillar connecting the top plate at a first port positioned on one surface based on the short-circuited stub to the bottom plate at a second port positioned on the opposite surface of the first port based on the short-circuited stub; and a second metal pillar separated from the first metal pillar, and connecting the top plate at the second port to the bottom plate at the first port. | 03-05-2015 |