Chlorinated solvents are a class of interrelated chemicals that have gone through major regulatory scrutiny in recent years. A number of chlorinated solvents are used in the electronics industry in printed circuit board (PCB) fabrication and assembly; semiconductor wafer fabrication and assembly; and critical cleaning applications. The growth in the electronics industry in the last few decades ...

Original scientific paper The micro-resistance measuring principle with specific forms of current distribution in the plated through-hole of printed circuit board (PCB) is analyzed in this paper. Special attention is paid to the following factors that influence the micro-resistance measuring: the hole diameter, the type of the measuring probe and the PCB thickness, and their two and three-facto...

In this letter, a design for broadband circularly slotted patch antenna fabricated on a singlelayered printed circuit board (PCB) with unidirectional radiation is described. It is fed by a simple center-fed feeding scheme. Unlike conventional slotted patch antennas, the proposed antenna is loaded with four short pins such that both matching and axial-ratio (AR) bandwidths are improved. In addit...

Ball Grid Array packages in which I/O pins are arranged in a grid array pattern realize a number of connections between chips and a printed circuit board, but it takes much time in manual routing. We propose a fast routing method for 2-layer Ball Grid Array packages to support designers. Our method obtains a via assignment which distributes wires evenly on top layer and has high completion rati...

A new algorithm for a component placement machine is proposed in this study. The new algorithm is compared with former approaches on synthetically generated benchmark instances. It outperforms the former approaches by 3.28% on printed circuit board with 100 components to be placed. We prove that this new approach works better in a typical PCB mounted in the industry, so can be applicable to the...

The enormous advancement in science and technology has led to increase in the requirements for high speed data transmission. The increase in the speed of the digital circuits as well as the density of printed circuit board will often result in more challenging signal integrity issues. One of the most important signal integrity issues is radiated emission. We analyzed the radiation in different ...

A thermal via has been used to enhance the heat transfer through the printed circuit board (PCB). Because the thermal conductivity of a dielectric material is very low, the array of metal vias is placed to make thermal paths in the PCB. This paper describes the numerical analysis of the PCB having metal vias and focuses on the heat transfer characteristics under the nonisothermal boundary condi...

These three quantities can be derived from expressions in antenna theory textbooks [1, 2]. Note that the radiation resistance increases as the fourth power of the ratio of the loop dimension (e.g., radius) to the wavelength, which is the same as the fourth power of the loop dimension times frequency. The loss resistance, arising from the skin effect, only increases as the square root of the fre...

The current practice in the assembly of electronic components on printed circuit boards (PCBs) is serial production. a process characterized by very long set-up times. However, with the advent of efficient on-line process information .. new production control methods are now possible. This paper proposes a different production method, called the group set-up (GSU) method, which can significantl...

This paper discusses the design of a hierarchically structured process planning system for a printed circuit board assembly hne. BasIcally. the assembly system consists of a series of mdependently operatmg placement modules, connected by a carrlerless conveyor system. Both the modules and the conveyor system are fully automated, while the complete system 1s also under centrahzed computer contro...