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Pcb parallel coplanar strip impedance

Jack Browne Aug 22, Circuit designers choose transmission-line technologies based on a number of factors, including expected high-frequency performance and ease of implementation. Although transmission-line choices include some more exotic varieties, such as coplanar-waveguide CPW technology, the decision often boils down to either microstrip or stripline. Recognizing the differences between the two technologies can help nail down the best option. The two high-frequency transmission-line technologies date back to the early s.
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RF PCB design layout and recommendations

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RF PCB design layout and recommendations

Fiber weave effect timing skew is becoming more of an issue as bit rates continue to soar upwards. It was modeled and simulated using Agilent ADS software. So what is fiber weave effect anyways and why should we be concerned about it? Since the dielectric material used in the PCB fabrication process is made up of fiberglass yarns woven into cloth and impregnated with epoxy resin, it becomes non-homogeneous. The higher the Dk , the slower the signal propagates along the transmission line. When one trace happens to line up over a bundle of glass yarns for a portion of its length, as illustrated by the top trace in the figure on the left, the propagation delay is different compared to another trace of the same length which lines up over mostly resin. This is known as timing or phase skew and is due to the delta Dk surrounding the respective traces.
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Optimizing the RF feedline in PCB design

Typically, all connections in a digital circuit board are impedance controlled. This is by virtue of the fact that most layout designers will define, for example, 50 ohms as the default routing model for single ended connections. The significance of defining the transmission line physical parameters prior to layout commencing is that the type of transmission line structure chosen will have a major effect on the component placement in RF circuits, particularly in terms of placement density.
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The present invention relates to methods of transmitting electrical signals through Printed Circuit Board PCB with minimized signal losses. More particularly, the present invention concerns topology of PCB strip-lines or micro- strips to achieve maximum benefit from conductor surface treatment to minimize skin effect losses. Data rate of signals transmitted over PCB in electronic equipment, such as computers, network switches and routers, servers or supercomputers is reaching level at which dissipation in the PCBs could be as big as 10 times over single transmission line.

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