-
- News
- Books
Featured Books
- smt007 Magazine
Latest Issues
Current IssueSupply Chain Strategies
A successful brand is built on strong customer relationships—anchored by a well-orchestrated supply chain at its core. This month, we look at how managing your supply chain directly influences customer perception.
What's Your Sweet Spot?
Are you in a niche that’s growing or shrinking? Is it time to reassess and refocus? We spotlight companies thriving by redefining or reinforcing their niche. What are their insights?
Moving Forward With Confidence
In this issue, we focus on sales and quoting, workforce training, new IPC leadership in the U.S. and Canada, the effects of tariffs, CFX standards, and much more—all designed to provide perspective as you move through the cloud bank of today's shifting economic market.
- Articles
- Columns
- Links
- Media kit
||| MENU - smt007 Magazine
Does Copper Pour on a Signal Layer Decrease Signal-To-Signal Isolation?
April 7, 2022 | Steve Hageman, Analog HomeEstimated reading time: 1 minute

Does putting a ground pour on PCB signal layers make the isolation better or worse? It can go either way, but with the proper knowledge and application, this technique will improve your designs.
In this article, I’ll discuss how to simulate trace-to-trace isolation with true electromagnetic simulation software. We’ll also cover a variety of rules of thumb that can help you stay away from trouble.
Fact or Fiction?
Recently an acquaintance told me, “I have heard that putting a copper pour on a signal layer between traces actually makes the isolation between the traces worse.” I grabbed one of my RF boards and said, “If that is so, then how do all these RF boards that I have done with co-planar waveguide over ground manage to function? They all have copper pours on the signal layer, and they work to very high frequencies.”
Since co-planar waveguide over ground (CPWG), which is essentially “pouring copper on a signal layer,” is used for a lot of RF work, and is proven to work for very high-performance RF circuits, how did this contradictory opinion catch on in the industry?
To investigate this, I used a one-inch section of 50-ohm microstrip consisting of an aggressor trace from ports 1 to 2 and a victim trace running in parallel from ports 3 to 4. I used typical values for the dimensions as might be on a real PCB. The trace width is 20 mils, with a spacing of 60 mils from center to center, over an FR-4 substrate, 9.5 mils thick, with a modeled Er of 4.4.
To read this entire article, which appeared in the March 2022 issue of Design007 Magazine, click here.
Testimonial
"In a year when every marketing dollar mattered, I chose to keep I-Connect007 in our 2025 plan. Their commitment to high-quality, insightful content aligns with Koh Young’s values and helps readers navigate a changing industry. "
Brent Fischthal - Koh YoungSuggested Items
How Good Design Enables Sustainable PCBs
08/21/2025 | Gerry Partida, Summit InterconnectSustainability has become a key focus for PCB companies seeking to reduce waste, conserve energy, and optimize resources. While many discussions on sustainability center around materials or energy-efficient processes, PCB design is an often overlooked factor that lies at the heart of manufacturing. Good design practices, especially those based on established IPC standards, play a central role in enabling sustainable PCB production. By ensuring designs are manufacturable and reliable, engineers can significantly reduce the environmental impact of their products.
50% Copper Tariffs, 100% Chip Uncertainty, and a Truce
08/19/2025 | Andy Shaughnessy, I-Connect007If you’re like me, tariffs were not on your radar screen until a few months ago, but now political rhetoric has turned to presidential action. Tariffs are front-page news with major developments coming directly from the Oval Office. These are not typical times. President Donald Trump campaigned on tariff reform, and he’s now busy revamping America’s tariff policy.
Global PCB Connections: Understanding the General Fabrication Process—A Designer’s Hidden Advantage
08/14/2025 | Markus Voeltz -- Column: Global PCB ConnectionsDesigners don’t need to become fabricators, but understanding the basics of PCB fabrication can save you time, money, and frustration. The more you understand what’s happening on the shop floor, the better you’ll be able to prevent downstream issues. As you move into more advanced designs like HDI, flex circuits, stacked vias, and embedded components, this foundational knowledge becomes even more critical. Remember: the fabricator is your partner.
MKS’ Atotech to Participate in IPCA Electronics Expo 2025
08/11/2025 | AtotechMKS Inc., a global provider of enabling technologies that transform our world, announced that its strategic brands ESI® (laser systems) and Atotech® (process chemicals, equipment, software, and services) will showcase their latest range of leading manufacturing solutions for printed circuit board (PCB) and package substrate manufacturing at the upcoming 17th IPCA Show to be held at Pragati Maidan, New Delhi from August 21-23, 2025.
MKS Showcases Next-generation PCB Manufacturing Solutions at the Thailand Electronics Circuit Asia 2025
08/06/2025 | MKS Instruments, Inc.MKS Inc, a global provider of enabling technologies that transform our world, today announced its participation in Thailand Electronics Circuit Asia 2025 (THECA 2025), taking place August 20–22 at BITEC in Bangkok.