KMW Inc and Sk Telesys Co. | Date: 2016-01-28
Some embodiments of the present disclosure relate to an analog distributed antenna system, and its operating method, provided with an orthogonal frequency division multiplexing (OFDM) high-speed modem for use in transceiving control signals between a main unit and remote units in order to effectively control the remote units connected to the main unit.
KMW Inc | Date: 2017-01-04
A multi-band antenna apparatus according to one of various embodiments of the present invention may comprise: an antenna housing in which an antenna module having two or more frequency bands is mounted; a plurality of repeaters detachably coupled to the antenna housing according to slide movement thereof; connector parts which protrude from the antenna housing and are connected to the plurality of repeaters, respectively; and a bracket which fixes the antenna housing to an outer wall and couples the plurality of repeaters to the antenna housing in an individually detachable manner.
KMW Inc | Date: 2017-03-01
The present disclosure in some embodiments provides an antenna line device installed in each antenna apparatus of a multiple antenna system, including a control part for controlling according to control signal from a base station body, and at least two of a DC ping part, RF ping part and domain detection part. The DC ping part is configured to include an electrical element installed in an operating power transfer path to cause a voltage drop, and to detect an operating power level before or after the voltage drop caused by the electrical element under the control of the control part. The RF ping part is configured to check a connection of feeder lines to corresponding antenna arrays by detecting signals inputted through the feeder lines under the control of the control part. The domain detection part includes a switch configured to be installed in a control data transfer path and to be turned on/off for identifying an antenna apparatus that covers each coverage sector.
KMW Inc | Date: 2016-09-14
The present invention relates to a multiband antenna comprising: a reflector providing a ground plane; a first radiation module for a first frequency band, provided on the reflector; and a plurality of second radiation modules for a second frequency band, laminated on the first radiation module, wherein: the first radiation module includes first to fourth radiation elements symmetrically combined in four directions on an entire plane, wherein each of the first to fourth radiation elements includes a radiation arm in a cup shape and a support for supporting and fixing the radiation arm to the reflector, and the second radiation modules are provided to each radiation arm of the first to fourth radiation elements, wherein the lower surface of the cup shape of each radiation arm of the first to fourth radiation elements is designed to have a predetermined area for providing the ground plane to the second radiation modules.
KMW Inc | Date: 2016-03-23
In the present invention, a radio communication antenna having a narrow beam width comprises: a reflecting plate provided in the form of a plate of rectangular shape; and one radiating module disposed on the reflecting plate and generating x-polarized waves. Here: the radiating module comprises four radiating elements of dipole structure; the four radiating elements are respectively disposed at four edge portions of the reflecting plate, and each comprises two radiating arms placed in the direction extending along both sides relative to the edges; and, among the four radiating elements, those radiating elements that face each other diagonally are linked in movement so as to generate one of the x-polarized waves.
KMW Inc | Date: 2016-09-28
Various embodiments of the present invention comprise: an antenna module; and at least one RRH which is arranged to face the outer surface of the antenna module, is coupled by being directly connected to the antenna module and arranged along the longitudinal direction of the antenna module, wherein a plurality of cooling air gaps are provided between the outer surface of the antenna module and the RRH.
KMW Inc | Date: 2016-10-26
The present disclosure in some embodiments provides an antenna control system wherein multiple primaries perform selective communications with antenna line devices (ALDs) and its operation method. Some embodiments provide an antenna control system including a switching unit which is interconnected between at least one functional unit for controlling an antenna of a radio base station and a plurality of control devices for transmitting a control signal to the functional unit so as to control as well as power the functional unit, and is configured to selectively electrically connect any of the plurality of control devices to the functional unit.
KMW Inc | Date: 2016-05-04
The present invention relates to a method for controlling dimming of a streetlamp to reduce power consumption. In the method for controlling the dimming of the streetlamp, the streetlamp comprises a plurality of illumination units, of which dimming can be individually controlled, and at least one illumination unit among the plurality of illumination units has a wattage smaller than that of another illumination unit. According to the present invention, a plurality of LEDs included in a streetlamp are randomly divided according to the direction of progress of a vehicle and dimming of the divided LEDs are controlled with different levels, so that luminance degradation felt by a driver on a road can be minimized. As a result, the present invention can save energy and solve inconvenience to the driver.
KMW Inc | Date: 2016-03-16
The present invention relates to a stand-type LED lighting device comprising: a stand part; a support part fixed to the stand part and extending upwards; and a lighting part which is fixed to the upper part of the support part and emits light, wherein the lighting part comprises: an inclined reflective plate; an upper lighting part positioned above the reflective plate; and a lower lighting part positioned below the reflective plate. In the present invention, the lighting part is divided into the upper lighting part and the lower lighting part, and the reflective plate is provided between the upper lighting part and the lower lighting part so as to enable each or both of the upper lighting part and the lower lighting part to be used according to a users selection, thereby enabling the stand-type LED lighting device to be used as a room lighting lamp or a mood lamp, in accordance with circumstances.
KMW Inc | Date: 2016-01-13
The present invention relates to a radio frequency filter comprising: a first filter unit for filtering a signal in a first frequency band, which is a basic frequency band; a second filter unit for filtering a signal in a second frequency band, which is an additional frequency band in addition to the basic frequency band; and a switching unit having a structure in which at least one resonance terminal among one or more resonance terminals constituting the second filter unit is connected to or blocked from a ground terminal so as to eliminate or maintain the resonance function of the relevant resonance terminal(s).