Abstract: A liquid crystal-based microstrip patch antenna for widening a frequency tuning range and miniaturizing a radiating unit are provided. The microstrip patch antenna includes at least one feeding unit, at least one radiating unit, a plurality of dielectric substrates including the feeding unit and the radiating unit and formed in a stack structure, a liquid crystal cavity interposed between the plurality of dielectric substrates stacked on each other, and at least one DC bias line to receive power from a power supply and to apply an electric field to the liquid crystal cavity through the radiating unit.

Abstract: A method for measuring a high-accuracy and real-time heart rate based on a continuous-wave radar is provided. The method includes receiving an in-phase (I) signal and a quadrature (Q) signal for a receive signal received through the continuous-wave radar, selecting any one signal by comparing magnitudes of the received I signal and the received Q signal, performing frequency transform of each of bases respectively having predetermined phases with respect to the any one selected signal, and determining a heart rate based on a magnitude response of each of the bases by the frequency transform.

Abstract: A method for measuring a high-accuracy and real-time heart rate based on a continuous-wave radar is provided. The method includes receiving an in-phase (I) signal and a quadrature (Q) signal for a receive signal received through the continuous-wave radar, selecting any one signal by comparing magnitudes of the received I signal and the received Q signal, performing frequency transform of each of bases respectively having predetermined phases with respect to the any one selected signal, and determining a heart rate based on a magnitude response of each of the bases by the frequency transform.

Abstract: An unmanned aerial vehicle (UAV) detection method and a system therefor are provided. The UAV detection method includes receiving a radio signal from air, detecting a global positioning system (GPS) leakage signal of a predetermined frequency from the received radio signal, and determining that a UAV is detected when the GPS leakage signal is detected.

Abstract: A biosignal detecting apparatus and a method therefor are provided. The biosignal detecting apparatus includes a signal generator configured to generate a predetermined specific frequency signal, at least two transmit helix antennas configured to transmit circular polarizations according to the specific frequency signal to a subject, a receive helix antenna configured to receive a circular polarization including a biosignal reflected from the subject, a mixer configured to generate an intermediate frequency (IF) signal by mixing the received circular polarization with the specific frequency signal and a detecting unit configured to detect the biosignal of the subject from the IF signal.

Abstract: An unmanned aerial vehicle (UAV) detection method and a system therefor are provided. The UAV detection method includes receiving a radio signal from air, detecting a global positioning system (GPS) leakage signal of a predetermined frequency from the received radio signal, and determining that a UAV is detected when the GPS leakage signal is detected.

Abstract: A K-band frequency modulated continuous wave (FMCW) weather radar system is provided for measuring precipitation in the atmosphere. The apparatus includes a RF transmitter which modulates the input signal of the first baseband unit, this transmitted baseband signal is scattered by the target. A RF receiver receives the signal and demodulates that signal. Further, this demodulated signal goes to mixer and is mixed with local oscillator to generate beat frequency. An IF (intermediate frequency) signal of K-band FMCW radar can be treated as time and frequency domain signals due to a unique property of linear frequency modulation (LFM). Frequency synthesizer generates a reference signal for coherent operation of overall FMCW radar system. The second baseband unit down-converts the beat signal and generates I/Q signal. Finally the signal is converted into digital form utilizing analog-to-digital converter.

Abstract: Provided are an apparatus and method for measuring a dielectric constant. The apparatus includes a cavity resonator including a cavity therein, an insertion hole penetrating through the cavity vertically and in which a sample is inserted, and grooves symmetrically formed with respect to the cavity in the insertion hole, a network analyzer configured to generate an electromagnetic signal supplied to the cavity resonator, receive an electromagnetic signal passed through the cavity resonator, and calculate a scattering parameter, a transmission means configured to supply the generated electromagnetic signal to the cavity resonator, a reception means configured to supply the electromagnetic signal passed through the cavity resonator to the network analyzer, and a calculation processor configured to receive the scattering parameter from the network analyzer and calculate a dielectric constant of the sample.

Abstract: A method and a system for a multiband, dual polarization, and switch mode beamforming antenna for a small cell base station are disclosed.

Abstract: Provided are an apparatus and method for measuring a dielectric constant. The apparatus includes a cavity resonator including a cavity therein, an insertion hole penetrating through the cavity vertically and in which a sample is inserted, and grooves symmetrically formed with respect to the cavity in the insertion hole, a network analyzer configured to generate an electromagnetic signal supplied to the cavity resonator, receive an electromagnetic signal passed through the cavity resonator, and calculate a scattering parameter, a transmission means configured to supply the generated electromagnetic signal to the cavity resonator, a reception means configured to supply the electromagnetic signal passed through the cavity resonator to the network analyzer, and a calculation processor configured to receive the scattering parameter from the network analyzer and calculate a dielectric constant of the sample.

Abstract: An antenna apparatus that may be adapted to various environments. The antenna apparatus includes a radiation unit to transmit and receive in a 360° radius including a plurality of radiators, each radiator configured to radiate a main emission pattern in different direction; and a switch unit configured to selectively operate each of the plurality of radiators.

Abstract: An antenna apparatus that may be adapted to various environments. The antenna apparatus includes a radiation unit to transmit and receive in a 360° radius including a plurality of radiators, each radiator configured to radiate a main emission pattern in different direction; and a switch unit configured to selectively operate each of the plurality of radiators.

Abstract: Disclosed herein is a dielectric chip antenna structure using a metal conductor formed at the lateral side of the antenna along the longitudinal direction of the antenna. The dielectric chip antenna structure forms the metal conductor at the long side of the antenna to induce antenna resonance through coupling effect between the antenna and the ground. Furthermore, the dielectric chip antenna structure minimizes the space occupied by the antenna and modifies the theoretical feeding structures of the reverse F type antenna and monopole antenna to meet user's various demands.

Abstract: The present invention provides an multi-layered multi-band antenna used for a communication apparatus for a mobile communication service, comprising: a PCB having power supply and ground portions; an upper plane antenna separated from an upper plane of the PCB, the upper plane antenna consisting of a metal conductor having a predetermined pattern formed with a U-shaped slot; an intermediate plane antenna interposed between the upper plane antenna and the PCB in parallel with the upper plane antenna, the intermediate plane antenna consisting of a metal conductor having a predetermined pattern formed with a U-shaped slot; a power supply metal conductor having the one side connected to a power supply portion of the PCB and the other side connected to one side of the intermediate plane antenna; a ground metal conductor having the one side connected to a ground portion of the PCB and the other side connected to one side of the intermediate plane antenna; and a plurality of short-circuiting metal conductors interpo

Abstract: An internal antenna for use in a mobile handset is formed of a single conductive plate. The internal antenna includes a first meander-shaped portion having one or more slots, including a first bent portion bent downward at a side edge of the first meander-shaped portion; a second meander-shaped portion having one or more slots, including a second bent portion bent downward at an end of the second meander-shaped portion; and a common portion physically connected to the first and the second meander-shaped portion. The first meander-shaped portion together with the common portion forms a first radiating element and the second meander-shaped portion together with the common portion forms a second radiating element, the first radiating element having a first resonant frequency and the second radiating element having a second resonant frequency.

Abstract: The present invention is directed to an internal multi-band antenna with multiple layers and which comprises a main radiation patch for forming an upper side of the antenna, one side of the main radiation patch connected to a feeder, the main radiation patch including a plurality of strips in the same plane and formed by a folded slit patch of maze type; and at least one auxiliary radiation patch bent downwardly at one side of an edge of the main radiation patch and formed in parallel to the main radiation patch between the main radiation patch and a feeder ground plane.

Abstract: The present invention is directed to a multi-band cable antenna.

Abstract: The present invention provides an multi-layered multi-band antenna used for a communication apparatus for a mobile communication service, comprising: a PCB having power supply and ground portions; an upper plane antenna separated from an upper plane of the PCB, the upper plane antenna consisting of a metal conductor having a predetermined pattern formed with a U-shaped slot; an intermediate plane antenna interposed between the upper plane antenna and the PCB in parallel with the upper plane antenna, the intermediate plane antenna consisting of a metal conductor having a predetermined pattern formed with a U-shaped slot; a power supply metal conductor having the one side connected to a power supply portion of the PCB and the other side connected to one side of the intermediate plane antenna; a ground metal conductor having the one side connected to a ground portion of the PCB and the other side connected to one side of the intermediate plane antenna; and a plurality of short-circuiting metal conductors interpo

Abstract: Disclosed is a wireless heart rate sensing system which comprises: an oscillator for generating signals of a specific frequency; a power divider for dividing power of the signals generated by the oscillator; a transmit antenna for radiating a first signal output by the power divider to a patient's chest; a receive antenna for receiving a signal, the frequency of which is transited by a motion of the patient's chest and which is reflected and returned; a mixer for combining frequency components of an RF signal received through the receive antenna and a second signal output by the power divider; and a baseband unit for filtering the signal combined by the mixer, converting it into a digital signal, and outputting the digital signal.

Abstract: An internal antenna for use in a mobile handset is formed of a single conductive plate. The internal antenna includes a first meander-shaped portion having one or more slots, including a first bent portion bent downward at a side edge of the first meander-shaped portion; a second meander-shaped portion having one or more slots, including a second bent portion bent downward at an end of the second meander-shaped portion; and a common portion physically connected to the first and the second meander-shaped portion. The first meander-shaped portion together with the common portion forms a first radiating element and the second meander-shaped portion together with the common portion forms a second radiating element, the first radiating element having a first resonant frequency and the second radiating element having a second resonant frequency.