Abstract:
The present invention relates to a wireless communications system. An antenna apparatus for the wireless communications system comprises: a base; a plurality of Yagi-Uda antenna modules which are arranged in a fixed array on the base; a plurality of floating metal modules which are installed on the top of the Yagi-Uda antenna modules and are selectively connected to the corresponding Yagi-Uda antenna module among the Yagi-Uda antenna modules; a switching device which allows selective switching of the floating metal modules and the Yagi-Uda antenna modules; and a controller which controls the Yagi-Uda antenna modules to have the directivity in a desired direction by selectively switching the switching device.
Abstract:
The present invention relates to a spin modulator with a phase control unit which includes: a spin array composed of spin oscillators of an m x n matrix (m>=1, n>=1); a selection control unit which selectively operates the spin oscillators according to an operation condition; and a phase control array composed of m x n phase control units to control the phase locked operations of the spin oscillators according to the change of the operation condition.
Abstract:
According to the present invention, an OOK modulator is configured to comprise: an oscillator outputting a first frequency signal changing frequency depending on an input voltage; a frequency multiple switching unit switching on and off a second frequency signal which is an integral multiple of the first frequency signal by driving the same depending on the OOK input data; and a switching amplifier outputting an OOK modulation signal by amplifying and switching the second frequency signal depending on the OOK input data.
Abstract:
The present invention relates to a spin transfer torque oscillator using an injection locking method and more particularly, to a spin torque type injection locking oscillator and a designing method thereof, capable of improving output and noise properties by locking phase by inserting an output signal of a spin transfer torque element with high noise properties into a spin transfer torque element with high power properties by using a pair of spin torque transfer elements with different power and noise properties. The present invention performs a nanoscale integration, reduces a size thereof, obtains high quality, reduces manufacturing costs, and performs mass production by providing the oscillator with high output power and phase noise properties. [Reference numerals] (301) Spin torque type element for high output power; (302) Spin torque type element for low noise; (303) Second power unit; (304) First power unit; (309) Current control injection oscillator; (310) Current control oscillator; (AA) Second oscillation signal; (BB) First oscillation signal
Abstract:
The present invention relates to a vertical embedded Yagi-Uda antenna applied with an image theory, which includes: a dielectric in which a plurality of via holes are formed vertically; a radiator with a length of λ/4 of a feeding signal wavelength in which one of the via holes is filled with a metal; at lease one waveguide which has a shorter length than the radiator, and has a via hole arranged in one side of the radiator and filled with a metal; a reflector which has a longer length than the radiator, and has a via hole arranged in the other side of the radiator and filled with a metal; and a ground plane formed on the upper part of the dielectric. The vertical embedded Yagi-Uda antenna applied with the image theory according to the present invention can reduce the antenna size and can reduce manufacturing costs through process simplification, and can minimize loss by connecting a transceiver integrated chip and the vertical embedded Yagi-Uda antenna applied with the image theory without an additional configuration.
Abstract:
PURPOSE: A phase locked loop (PLL) suitable for a spin transfer torque oscillator is provided to improve the phase noise property of the oscillator advantageous to high speed communication. CONSTITUTION: A phase locked loop (PLL) suitable for a spin transfer torque oscillator includes an oscillating part (1) and a frequency locking part (2). The oscillating part has the oscillators (11,12) of which the oscillating frequencies are inversely proportional to an input current. The oscillators are arranged into n x m matrices in the oscillating part. Two oscillators are mutually integrated into a pair of the oscillators in a row, and then are finally pre-scaled into one output in a column direction. The frequency locking part outputs the first row of the oscillating part into an operating frequency, and compares the output frequency of the last row with a referential frequency in order to lock the operating frequency.
Abstract:
PURPOSE: An OFDM(Orthogonal Frequency Division Multiplexing) circuit based on RF technology and a signal processing apparatus using the same are provided to the super high speed wireless transmission of more than 1Gbps in 1024 OFDMby performing the transmission of more than 1-10Mbps in one carrier wave. CONSTITUTION: A digital signal source(100) of the number of d×b generates carrier waves of the number of d×b by successively receiving a frequency locking signal having a signal value of the number of d×b. The digital signal source generates a digital modulation signal of the number of d×b by using the carrier waves of the number of d×b. The digital signal source comprises a spin digitally controlled oscillator(110) and a spin modulator(120) generating the digital modulation signal. A digital modulation controller(300) generates a modulated control signal of the number of d×b to control a digital spin modulation operation of the spin modulator. An amplifier(400) is located in an output terminal of an RF base OFDM circuit.
Abstract:
PURPOSE: A phase shifter is provided to implement small insertion loss through a phase delay of a signal by controlling an effect dielectric constant of a substrate with an air gap. CONSTITUTION: A GCPW(Ground Co-Planar Wave Guide) phase shifter is composed of a transfer substrate(100), a first metal layer(102), a signal line(104), a second metal layer(106), and an air gap(108). The transfer substrate is formed by using a plurality of ceramic substrates. The first metal layer is grounded in a lower part of the transfer substrate. A signal line is formed in the constant area of the upper part of the transfer substrate. The second metal layer is grounded in an upper part of the transfer substrate. The air gap is formed inside the transfer substrate between the first metal layer and the signal line.