摘要:
Disclosed herein is a printed circuit board including a landless via and a method of manufacturing the printed circuit board. The printed circuit board includes a landless via having no upper land. The via includes a circuit pattern having a line width smaller than the minimum diameter of the via. The via does not have an upper land on an end surface thereof having the minimum diameter, and thus a circuit pattern connected to the via is finely formed, resulting in the high-density circuit pattern. Thus, a compact printed circuit board having a reduced number of layers is realized.
摘要:
According to an embodiment of the present invention, an electromagnetic bandgap structure can include: at least three conductive plates; a first stitching via, configured to electrically connect any one of the conductive plates to another conductive plate; and a second stitching via, configured to electrically connect the one conductive plate to yet another conductive plate. In the electromagnetic bandgap structure of the present invetion, the first stitching via can electrically connect the one conductive plate to another conductive plate by allowing a part of the first stitching via to be connected through a planar surface above the one conductive plate, and the second stitching via can electrically connect the one conductive plate to yet another conductive plate by allowing a part of the second stitching via to be connected through a planar surface below the one conductive plate.
摘要:
According to the present invention, the board can include a dielectric layer; a plurality of conductive plates; and a stitching via, to electrically connect two of the conductive plates to each other. Here, the stitching via can include a first via and a second via, respectively, passing through the dielectric layer and having one end part being placed on a same planar surface as each of the two conductive plates; a connection pattern, having each end part being connected to the other end part of the first via and the second via, respectively; and a first extension pattern, placed on the same planar surface as one of the conductive plates and having one end part being connected to the one end part of the first via and the end part being connected to one of the conductive plates.
摘要:
A cavity capacitor fabrication method and a printed circuit board having an embedded cavity capacitor are disclosed. In accordance with an embodiment of the present invention, the printed circuit board having the embedded cavity capacitor includes two conductive layers to be used as a power layer and a ground layer, respectively; and a first dielectric layer, placed between the two conductive layers, wherein the cavity capacitor is placed between the two conductive layers, the cavity capacitor being formed to allow a second dielectric layer to have a lower stepped portion than the first dielectric layer, and the second dielectric layer using the two conductive layers as a first electrode and a second electrode, respectively, and placed between the first electrode and the second electrode.
摘要:
An electromagnetic bandgap structure and a printed circuit board that intercepts to transfer a signal having a predetermined frequency band are disclosed. In particularly, the electromagnetic bandgap structure includes a first metal layer and a second metal layer; a metal plate, placed between the first metal layer and a second metal layer; a multi-via, penetrating the first metal layer, passing through the same planar surface as an outer metal layer and turning toward the first metal layer to connect the metal plate and the first metal layer; and a dielectric layer, stacked in between the first metal layer and the metal plate, between the metal plate and the second metal layer and between the first metal layer and the outer metal layer. With the present invention, a bandgap frequency can be decreased without increasing the size of the metal plate.
摘要:
A control system providing more stable operation of an electric vehicle. From when the ignition switch is turned on to when the power ratchet period is completed, because the reset signal in the state of active “low” is supplied only once, communications between the MCU and apparatuses connected to the MCU can be stable. In addition, because the reset signal in the state of active “low” is not generated even though the ignition switch is turned on during the power ratchet period after the ignition switch is turned off, unnecessary booting does not occur. Therefore, a malfunction between the MCU and a battery management system can be prevented.
摘要:
A method for in-situ polycrystalline thin film growth is provided. A catalyst enhanced chemical vapor deposition (CECVD) apparatus is used to grow the polycrystalline silicon thin film. No subsequent annealing or dehydrogenating process is needed. The method comprises exhausting a chamber to form a vacuum chamber, and then purging vacuum chamber and introducing a catalyst. A substrate is then placed in the vacuum chamber and reaction gas is injected into the chamber. The reaction gas reacts with the catalyst in the chamber to grow a polycrystalline thin film on the substrate. The inventive method reduces processing time and production cost and can be used to fabricate larger devices due to the elimination of bulky annealing equipment.
摘要:
A high frequency signal transmission line having reduced noise. Particularly, a signal transmission line of the current invention has reduced radiation noise and reflection noise, because a conventional ground guard fence line disposed between signal lines is separated into a plurality of ground line blocks that are spaced apart from each other to shield against noise.
摘要:
Disclosed herein is a via structure that minimizes high frequency loss. A PCB or an IC package of the present invention includes an insulation layer, a plurality of circuit layers, and one or more vias obliquely formed with respect to the circuit layers and constructed to have obtuse angles with respect to the directions of signal and power transmission.
摘要:
The present invention relates to an apparatus for manufacturing a diamond film having a large area which is used for a field emission display (FED) and a manufacturing method thereof.The apparatus for manufacturing a diamond film having a large area according to the present invention comprises a pulse laser generating system for generating a pulse laser beam, a laser beam scanner for scanning said pulse laser beam, and a vacuum chamber which includes a target and a substrate holder, wherein said laser beam having passed said laser beam scanner is irradiated on said target, and wherein a substrate on which a diamond film is to be formed by a plume produced from said target is set up to said substrate holder. The diamond film according to the present invention has a uniform electrical and mechanical properties and can be obtained in a short time period and with a uniform width and a large area. The diamond film manufactured according to the present invention can be also used for manufacturing emitters for FED having a large area and can increase the efficiency of the target because of the possibility of using the overall area thereof.