KMW Inc | Date: 2014-05-14
A Radio Frequency (RF) filter configured by combining a hybrid coupler with a general filter, for having different characteristics from original characteristics of a general filter is provided, in which a coupler receives an input signal through a first port, divides the input signal, outputs the divided signals through second and third ports, combines signals received through the second and third ports according to phases of the signals, and outputs the combined signal through the first port or as an output signal of the RF filter through a fourth port, and a first filter unit has a first port connected to the second port of the coupler and a second port connected to the third port of the coupler, for having a predetermined frequency filtering characteristic.
KMW Inc | Date: 2015-02-05
The present invention is an apparatus for dissipating heat through a heat sink, the apparatus comprising: a heat transfer member having one end with a contact surface contacting a heating element arranged on a substrate and the other end with a contact surface contacting the heat sink, the heat transfer member transferring the heat generated from the heating element to the heat sink; an elastic member for providing elastic force for pushing the heat transfer member toward the heating element; a guide member arranged in the heat sink to form a contact surface contacting the heat transfer member, the guide member mechanically guiding the heat transfer member such that the heat transfer member may slide and move toward the heating element; and a spacing member inserted between the substrate and the heat sink so as to maintain a preset spacing when the substrate and the heat sink are fixed and attached with each other.
KMW Inc | Date: 2014-02-04
The present invention relates to a radio frequency filter employing a notch structure, wherein the notch structure is a dual notch structure which comprises: a C notch structure formed in a predetermined region at a partition between two cavities to be cross-coupled; and an L notch structure formed together with the C notch structure in a predetermined region at a partition between two cavities.
KMW Inc | Date: 2014-02-27
A spherical lamp with easy heat dissipation comprises: a lower substrate and an upper substrate, in each of which a plurality of LEDs are embedded; a substrate support portion having a plate shape, to which the lower and upper substrates are coupled and fixed to lower and upper portions thereof, respectively; lower and upper covers, which are fixed to lower and upper portions of the substrate support portion, respectively, and each of which has a semi-spherical shape; a support portion, which is connected to an upper center portion of the substrate support portion and is exposed to the exterior through a center portion of the upper cover; and a heat dissipation plate which is formed on a rear surface of the heat dissipation plate and provided with a coupling portion into which an end of the support portion is inserted and fixed.
KMW Inc | Date: 2014-04-04
The present invention relates to a lighting method for an LED lighting apparatus, in which e.g. an LED for illuminating an edge of a light distribution pattern far away from a street lamp has a relatively larger illumination angle and a smaller radiation angle, and an LED for illuminating the center of a light distribution pattern near the street lamp and an edge of a light distribution pattern adjacent to the street lamp has a relatively smaller illumination angle and a smaller radiation angle. Thus, each LED illuminates different areas of the road, thereby ensuring the uniformity of illumination of an overall light distribution pattern.