Abstract: A parallel coupled CPW line filter is provided, including a first and a second coupled lines arranged on one side of an insulating body and connected in parallel with each other, and a ground arranged on the same plane as the first and the second coupled lines, comprising a pair of ground parts spaced apart from the first and the second coupled lines, respectively, the ground parts each comprising recesses sunken from areas close to the first and the second coupled lines.

Abstract: A device and method for generating an adjustable chaotic signal are provided. The chaotic signal generation device includes a plurality of triangle pulse train generators which generate a plurality of triangle waves having different frequency cycles, an adder which adds the triangle waves output from the triangle pulse train generators and outputs a noise signal, and a frequency modulator which converts the noise signal to a certain frequency band to output a chaotic signal. Accordingly, the power consumption and cost are reduced and the manufacture of the chaotic signal generation device is simplified due to the components integrated on an IC. Also, a plurality of users can use wireless communications in a particular wireless communications area.

Abstract: An ultra wideband antenna is provided that filters a predetermined frequency signal. The ultra wideband antenna includes a power feeding part that receives a supply of an external electromagnetic energy; a radiator excited by the electromagnetic energy fed through the power feeding part and radiating an electromagnetic wave; and a stub, provided on the radiator in a direction parallel to a direction of an electric field formed by the electromagnetic wave, that intercepts transmission/reception of a predetermined frequency band signal. The length of the stub may be ¼ of a wavelength of the intermediate frequency of the predetermined frequency band to be removed to filter the corresponding frequency band signal. The ultra wideband antenna simplifies the construction of an ultra wideband receiving system with the power loss and noise characteristics of the system improved.

Abstract: A mobile terminal and a method of inputting a message thereto are provided. The method of inputting a message includes analyzing an input voice signal and determining whether the voice signal corresponds to a message modification instruction, and modifying, if the voice signal corresponds to a message modification instruction, a message according to the voice signal. A user can thereby input a message through the input of a voice in the mobile terminal and modify the input message.

Abstract: A communication apparatus and a method for generating a signal thereof are provided. The communication apparatus adjusts a bandwidth or central frequency of an oscillating signal which is generated from a chaotic signal to be used in the modulation, or adjusts both the bandwidth and the central frequency. Accordingly, it is possible to transform the oscillating signal generated from the chaotic signal more diversely and thus to modulate an information signal more diversely and more adaptively.

Abstract: A communication apparatus using a chaotic signal and a method thereof are provided. The communication apparatus includes a correlator which multiplies source data by one of an optical orthogonal code (OOC) and a prime sequence code (PSC), and outputs transmission data, a transmission signal generating unit which generates a chaotic transmission signal by masking the transmission data with respect to a chaotic signal, and an antenna which transmits the chaotic transmission signal. As a result, multiple accesses are enabled, and a wireless communication system for short-distance operation, which is economic and low power-consuming, is provided.

Abstract: The present invention provides an electrolyte for solar cells, comprising a phthalocyanine (Pc) compound of Formula I as described herein, and solar cells using the same. According to the invention, energy conversion efficiency of the solar cells was improved by employing the phthalocyanine compound to the solar cells.

Abstract: A device and method for generating an adjustable chaotic signal are provided. The chaotic signal generation device includes a plurality of triangle pulse train generators which generate a plurality of triangle waves having different frequency cycles, an adder which adds the triangle waves output from the triangle pulse train generators and outputs a noise signal, and a frequency modulator which converts the noise signal to a certain frequency band to output a chaotic signal. Accordingly, the power consumption and cost are reduced and the manufacture of the chaotic signal generation device is simplified due to the components integrated on an IC. Also, a plurality of users can use wireless communications in a particular wireless communications area.

Abstract: A wireless communication terminal and a method for controlling power and using a channel by adjusting a channel bandwidth of the wireless communication terminal. The wireless communication terminal generates a plurality of channels by dividing at least part of a frequency band for ultra-wideband communications to a plurality of frequency bands, receives a chaotic signal having a plurality of frequency components in the channels, and adjusts a frequency bandwidth which forms the channel when a certain condition is satisfied. Accordingly, since the chaotic carrier is transmitted and received in the narrow frequency band by adjusting the frequency bandwidth, the power consumption can be reduced drastically and the high-quality communications are feasible between the portable terminal and the wireless headset in the optimized channel environment. Furthermore, a greater number of portable terminals and wireless headsets can execute the radio communications in a certain wireless communication range.

Abstract: A wireless communication terminal capable of changing a channel, and a channel changing method of the wireless communication terminal. The wireless communication terminal generates a plurality of channels by dividing at least part of a frequency band for ultra-wideband communications into a plurality of frequency sub-bands, receives a radio signal in at least one of the plurality of the channels, and changes a channel for receiving the radio signal. Accordingly, high quality communications are feasible between the transmitter terminal and the receiver terminal in an optimized channel environment, and signal interference between the receiver terminals connected to different transmitter terminals can be prevented. Additionally, it is possible to carry out the channel change rapidly and efficiently and to reduce the power consumption required to transmit and receive radio signals comprising a chaotic carrier signal.

Abstract: RF (radio frequency) communication devices which use a chaotic signal and a method thereof are provided. An RF communication system includes: a transmitter terminal which generates a chaotic signal including a plurality of frequency components in a predetermined frequency band and transmits a chaotic carrier generated by inserting a data signal including information to be transmitted into the chaotic signal to a receiver terminal; and the receiver terminal extracts the data signal from the chaotic carrier received from the transmitter terminal via a wireless network and outputs the extracted data signal. As a result, low power, light weight local area RF communication devices can be realized.

Abstract: A signal generator, a signal generation method, and a communication system using the same are provided. The signal generator includes a plurality of nonlinear elements which are connected in a ring; and a signal distributor which is arranged in the ring to form a closed loop, feeds part of a signal to one of the plurality of the nonlinear elements, and outputs signal generated by one of the plurality of nonlinear elements. The method includes arranging a plurality of nonlinear elements connected in a ring; inputting a signal to one of the nonlinear elements; amplifying the signal; receiving the amplified signal and generating a harmonic component of a frequency; clipping the signal; and feeding part of the signal back to one of the nonlinear elements and outputting a remainder of the signal. The system includes a chaotic signal generator; a signal distributor; a modulator; and a transmission circuit.

Abstract: An organic light emitting device and manufacturing method thereof includes a substrate; a first electrode formed on the substrate; a second electrode formed on the first electrode; an light emitting member interposed between the first electrode and the second electrode; and a photonic crystal member disposed in proximity to the substrate.

Abstract: A radio frequency (RF) communication system having a chaotic signal generator and a method of generating a chaotic signal. The RF communication system includes a chaotic signal generator which generates a chaotic signal having a plurality of frequency components at a predetermined frequency band, a modulator which generates a chaotic carrier by combining the chaotic signal with a data signal which indicates information, and a transmission circuit which includes an antenna to transmit the chaotic carrier made at the modulator. The frequency signal generator comprises an oscillator which converts a DC bias power into a high frequency power, and a resonating unit which generates a wideband signal having a plurality of frequency components by passing a predetermined frequency band of the high frequency power signal.

Abstract: A method of channel coding a digital communication system and a device using the same is provided. The method includes quantizing analog data to digital data, the digital data corresponding to a predetermined number of digital codes; allocating channel codes to the digital codes, as a Hamming distance between a pair of channel codes corresponding to any pair of the digital codes is proportional to a difference between analog values of the pair of the digital codes; and channel coding the digital data by using the channel codes which are allocated to the digital codes to generate channel coded digital data. Accordingly, digital data, such as multimedia digital data without source coding and the like, of which information significance is different may be effectively transmitted and received.

Abstract: A parallel coupled CPW line filter is provided, including a first and a second coupled lines arranged on one side of an insulating body and connected in parallel with each other, and a ground arranged on the same plane as the first and the second coupled lines, comprising a pair of ground parts spaced apart from the first and the second coupled lines, respectively, the ground parts each comprising recesses sunken from areas close to the first and the second coupled lines.

Abstract: An adjustable chaotic signal generator using pulse modulation for UWB communications, and a chaotic signal generating method thereof are provided. The chaotic signal generator for UWB communications includes a plurality of pulse generators which generates pulses of different frequencies; at least one combiner which combines the pulses generated at the pulse generators; and a plurality of local oscillators which receives signals from the combiner, respectively, and generates a chaotic signal by increasing the received signals to different frequency bands. Accordingly, a plurality of users can conduct the radio communications in a specific wireless communication range at the same time by generating the chaotic signal that can be split to the multiple channels. Also, the chaotic signal generator is structured using devices integratable on an integrated circuit.

Abstract: Provided a self-biased receiver system using a multi-fed antenna, including: at least one first port connected to an electronic circuit; and a second port connected to a feeder forming a DC (direct current) voltage using an input electromagnetic wave and feeding the DC voltage to the electronic circuit.

Abstract: An ultra wideband antenna is provided that filters a predetermined frequency signal. The ultra wideband antenna includes a power feeding part that receives a supply of an external electromagnetic energy; a radiator excited by the electromagnetic energy fed through the power feeding part and radiating an electromagnetic wave; and a stub, provided on the radiator in a direction parallel to a direction of an electric field formed by the electromagnetic wave, that intercepts transmission/reception of a predetermined frequency band signal. The length of the stub may be ¼ of a wavelength of the intermediate frequency of the predetermined frequency band to be removed to filter the corresponding frequency band signal. The ultra wideband antenna simplifies the construction of an ultra wideband receiving system with the power loss and noise characteristics of the system improved.