Abstract: Disclosed is a DPDT RF switch. The DPDT RF switch includes: first to fourth transmission lines for forming first to fourth ports, respectively; and first to fourth slot line pattern sections. The first slot line pattern section includes: a first slot line; and a first switching device for blocking signal transfer by short-circuiting a gap of a slot line. The third slot line pattern section includes: a third slot line; and a third switching device for blocking signal transfer by short-circuiting a gap of a slot line. The second slot line pattern section includes: a first loop-shaped slot line; a second slot line; and a second switching device for blocking signal transfer by short-circuiting a gap of a slot line. The fourth slot line pattern section includes: a second loop-shaped slot line; a fourth slot line; and a fourth switching device for blocking signal transfer by short-circuiting a gap of a slot line.

Abstract: A wireless communication base station shares one antenna between a main system and a subsystem. A signal combiner/divider is connected to each of the transmission/reception signal lines of a main and a subsystem duplexer and combines signals according to their phases and divides other signals. A filter is provided in the signal paths between the combiners/dividers.

Abstract: Various multi-mode resonant filters including a housing having a cavity, are provided. The multi-mode resonant filters include a Dielectric Resonant (DR) element received in the cavity of the housing, and a plurality of transmission lines for connecting a point on one of a first axis, a second axis, and a third axis with a point on another axis. The first axis, the second axis, and the third axis are orthogonal to each other with respect to a center of the DR element.

Abstract: An RF switch includes first, second and third transmission lines for forming ports, respectively, and first, second and third slot line pattern portions connected to one another, for transferring signals to the first, second and third transmission lines, respectively. The first slot line pattern portion has a slot line pattern for transferring a signal received from the first transmission line to a connection point with the other slot line pattern portions, and a switching circuit for shorting the gap of a corresponding slot line and thus blocking the signal transfer. The second slot line pattern portion includes a loop slot line formed by a first and a second half loop slot line, a second sub-slot line for transferring a signal received from the connection point to the second transmission line through the loop slot line, and a switching circuit for shorting the gap of a corresponding slot line.

Abstract: A repeater installed in a moving object is provided, in which a link antenna module has a plurality of link antennas steered to predetermined directions, for wirelessly communicating with a Base Transceiver Station (BTS), a link antenna path setting module selects at least one of the plurality of link antennas of the link antenna module and connects a path between the selected link antenna and a rear end, a service antenna module has at least one service antenna installed within the moving object, for wirelessly communicating with Mobile Stations (MSs) within the moving object, a relay signal processing module is connected to the link antenna module through the link antenna path setting module and processes transmission and reception relay signals between the link antenna module and the service antenna module, a movement information module measures current movement information about the moving object and provides the current movement information, a received signal measuring module measures a received signal o

Abstract: A variable radio frequency band filter capable of varying the resonance frequency band comprises a housing having a support; a number of resonator rods arranged along the longitudinal direction of the housing; at least one tuning rod positioned on top of the resonator rods; a tuning support extending through the respective tuning rods along the longitudinal direction of the housing and adapted to slide on top of the respective resonator rods to vary the position of the tuning rods; and a frequency variation unit positioned on a lateral surface of the housing. The frequency variation unit being coupled to an end of the tuning support and adapted to vary the position of the tuning rods, as the tuning support is slid, according to the frequency band.

Abstract: An antenna device for a mobile communication system is provided, in which a post has a selected external appearance. An antenna end is formed at an upper portion of the post for installing antenna parts, and a support end is formed at a lower portion of the post for fixing the antenna device to the ground. At least part of an external body of the antenna end is formed of a material that transmits transmission and received radio signals and a ground support member is formed under the support end to make an external body of the support end stand erect on the ground. The external appearance of the antenna device may take the form of a conventional utility, lamp, or sign post or pole.

Abstract: An array antenna system in a BS, in which a horizontal-beam-radiation-pattern-forming module has a horizontal-beam-radiation-pattern-former to form a horizontal beam radiation pattern for transmission/reception signals, dividing signals received from input/output ports at one end, shifting the phases of the divided signals complementarily, combining the phase-shifted signals from the different input/output ports at the one end, outputting the combined signals to input/output ports at the other end, and outputting signals received from the input/output ports at the other end by a reverse operation to the input/output ports at the one end, receives/outputs a plurality of transmission/reception signals from/to a BTS via the input/output ports at the one end of the horizontal-beam-radiation-pattern-former, and receives/outputs a plurality of transmission/reception signals from/to a plurality of antennas via the input/output ports at the other end of the horizontal-beam-radiation-pattern-former, and a plurality of

Abstract: Disclosed is a method for operating sectors of a base station in a mobile telecommunication system. For this, the method includes the steps of: outputting, at a prescribed time period equal to T1, data, including alpha sector data, beta sector data, and gamma sector data, which is to be transmitted to a mobile station, in sequence and by sectors; dividing a frequency in a scheme of time division at a time period which equals either t?, t? or t? and which corresponds to the data length by the sector of data which is output in the outputting data, and carrying out a frequency assignment in sequence and by the sector. Accordingly, only relevant data is transmitted to a sector assigned the frequency, and a traffic variation of each sector can be met.

Abstract: A radio frequency filter comprising: housing body having input/output connectors and containing space which is divided into spaces by means of diaphragm; at least one resonator rod arranged in the housing; housing cover coupled to the housing body; wherein the housing body and the housing cover are coupled to each other by laser welding. The radio frequency filter according to the present invention can reduce PIMD due to reduce Contact Nonlinearity, and inhibit to erode away because the laser welding method dissolve different metallic materials each other and take a convalent bond, and reduce its manufacturing process time and cost because it is unnecessary drilling a hole and fastening a screw to fasten the housing and the housing cover each other and can simplify its manufacturing process and raise productivity because only irradiate laser beam on irradiated area of the housing cover.

Abstract: A switchable combiner/divider with multiple inputs/outputs is provided. The switchable combiner/divider with multiple inputs/outputs includes multiple input ports for receiving multiple incoming signals, multiple output ports, a switching part for alternately connecting the multiple input ports to output ports as a circulating configuration, and a controller for providing switching control signals to the switching part.

Abstract: Disclosed is a radio frequency (RF) switch including: a circulator having first to third nodes, which are connected to first to third ports, respectively; and a slot line pattern unit installed in a connection line between the third node of the circulator and the third port so as to carry out signal transmission or interception, wherein the slot line pattern unit includes a switching circuit, which is installed at a predetermined location so as to transmit or intercept a signal by maintaining or short-circuiting a gap of a slot line corresponding to the installed location according to an external switching control signal.

Abstract: Disclosed is a DPDT RF switch. The DPDT RF switch includes: first to fourth transmission lines for forming first to fourth ports, respectively; and first to fourth slot line pattern sections. The first slot line pattern section includes: a first slot line; and a first switching device for blocking signal transfer by short-circuiting a gap of a slot line. The third slot line pattern section includes: a third slot line; and a third switching device for blocking signal transfer by short-circuiting a gap of a slot line. The second slot line pattern section includes: a first loop-shaped slot line; a second slot line; and a second switching device for blocking signal transfer by short-circuiting a gap of a slot line. The fourth slot line pattern section includes: a second loop-shaped slot line; a fourth slot line; and a fourth switching device for blocking signal transfer by short-circuiting a gap of a slot line.

Abstract: Disclosed is a dual-band dual-polarized antenna for a mobile communication base station, which includes: a reflection plate; a first radiation device module for transmitting and receiving two linear orthogonal polarizations for a first frequency band, the first radiation device module generally having a square shape, the first radiation device module including a plurality of dipoles arranged to form the square shape, each of the dipoles substantially having a transverse side and a vertical side; and a second radiation device module for a second frequency band which is arranged within the square shape of the first radiation device module, and includes a plurality of dipoles generally arranged to form a cross-shape.

Abstract: An RF switch is provided. In the RF switch, a slot line is divided into a first slot line and a second slot line and an open-end circuit is provided at each end portion of the first and second slot lines. A first transmission line delivers signals from and to the first slot line, and a second transmission line delivers signals from and to the second slot line. A third transmission line delivers signals from and to the portion of the slot line that separates the first slot line from the second slot line. A variable sub open-end circuit portion includes at least one open-end circuit which is selectively switched to the first or second slot line according to an external switching control signal.

Abstract: An RF switch includes first, second and third transmission lines for forming ports, respectively, and first, second and third slot line pattern portions connected to one another, for transferring signals to the first, second and third transmission lines, respectively. The first slot line pattern portion has a slot line pattern for transferring a signal received from the first transmission line to a connection point with the other slot line pattern portions, and a switching circuit for shorting the gap of a corresponding slot line and thus blocking the signal transfer. The second slot line pattern portion includes a loop slot line formed by a first and a second half loop slot line, a second sub-slot line for transferring a signal received from the connection point to the second transmission line through the loop slot line, and a switching circuit for shorting the gap of a corresponding slot line.