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.