May 8, 2025

Smart Polygons: Advanced PCB Design Just Got Easier

Advanced complex PCB boards using Flux's Smart Polygons

We're excited to unveil our Smart Polygon system in Flux! This powerful capability builds on top of our automatic copper fills to transform how you create and manage custom copper areas in your PCB designs.

Smart Polygons in Flux behave intuitively like traces, making them straightforward to learn and use—start directly from any pad with automatic net association, simply click to place and adjust points, and watch as copper intelligently reflows in real-time. Let’s dive in!

What Are Polygons and Why Do They Matter?

In PCB design, polygons are customizable copper shapes directly tied to a specific net. They’re crucial because they significantly influence the electrical performance and reliability of your PCB. Polygons allow you to optimize your board layout for specific electrical properties, including improved grounding, controlled impedance, and efficient heat distribution.

Specifically, polygons are indispensable for:

  • Ground and Power Planes: Ensure stable and reliable power distribution, reducing electrical noise and voltage fluctuations.
  • High Current Management: Create wide copper paths to efficiently carry higher currents, reducing resistance and heat.
  • RF and Antenna Design: Precisely shape copper areas to meet specific RF performance criteria, critical in high-frequency applications.
  • Thermal Management: Improve heat dissipation by strategically placing copper to draw heat away from sensitive components.
  • Signal Integrity: Minimize electromagnetic interference (EMI) and cross-talk by carefully shaping and placing copper planes.

View Projects with Polygons

Unlike zones—which define areas where copper cannot exist—polygons actively conduct electricity and shape your board's electrical performance, making them fundamental for advanced PCB designs.

Flux's Approach: Polygons Made Easy

At Flux, we prioritize intuitive, user-friendly workflows. Automatic copper fills were the first step. Now with polygons, we've continued this approach:

  • Easy Start: Begin directly from any pad—Flux automatically associates the polygon with the correct net.
  • Simple Drawing: Just click to place points and easily adjust your shapes afterward. No complicated setup required.
  • Automatic Copper Flow: Flux intelligently reflows copper in real-time, automatically handling object avoidance, ensuring clearances, and connectivity.

Polygons in Flux behave intuitively like traces, making them straightforward to learn and use, right from the start.

Powerful Capabilities, Accessible to Everyone

Polygons in Flux pack powerful functionality without complexity:

  • Multi-layer Polygons: Easily extend your copper shapes across multiple layers with automatic via stitching, simplifying complex designs.
  • Smart Editing: Quickly edit polygons—drag points to reshape, double-click to add or remove points—keeping your workflow smooth and fast.
  • Automatic Island Removal: Flux automatically removes disconnected copper "islands," ensuring your polygon remains clean and electrically connected.

Use Cases (With Examples)

Polygons unlock new possibilities in your PCB designs. Here are a few practical ways you'll benefit:

Smart Espresso Brewer: Optimize thermal and power management in consumer electronics with custom polygon shapes, ensuring reliability and consistent performance.
RF Antenna Filter: For RF antenna design, use polygons to minimize impedance mismatches and optimize current flow across transmission lines and radiating structures.
Electronic Speed Controller: For electronic speed controller design, use polygons to create low-impedance power paths that reduce voltage drops and improve current delivery to the motor.
ESP32 4 Ways Power Meter: When switching 220V loads with a 5V control signal using relays, use polygons to create wide, low-resistance traces that safely handle high current loads on the relay’s switched side.
RPi Pico Stepper Motor Driver: For stepper motor driver circuits, use polygons to improve thermal dissipation from the driver ICs and MOSFETs, enhancing reliability and performance under load.
12V to 5V Buck Converter: Use polygons to efficiently handle higher current paths, improving power distribution and thermal management.

Polygons for Designers of All Levels

Whether you're just dipping your toes into PCB design or you’re a veteran engineer tackling complex layouts, polygons in Flux offer the ideal balance of simplicity and capability:

  • Beginner-Friendly: Instantly intuitive—just click and draw. See immediate results as copper pours automatically.
  • Professional-Grade Control: Create sophisticated split planes, RF elements, and high-current copper shapes effortlessly, without losing precision or capability.

Try Polygons Today

Polygons are available now in Flux, ready to enhance your PCB design capabilities. Explore this powerful feature today and experience firsthand how advanced design can truly be this easy.

Dive in now and check out our detailed polygon documentation or jump straight into Flux to try it yourself. We can't wait to hear what you think!

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Nico Tzovanis

Nico is a professional electronics and PCB design engineer at Flux. Find him on Flux @nico

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Design PCBs with AI
Introducing a new way to work: Give Flux a job and it plans, explains, and executes workflows inside a full browser-based eCAD you can edit anytime.
Screenshot of the Flux app showing a PCB in 3D mode with collaborative cursors, a comment thread pinned on the canvas, and live pricing and availability for a part on the board.
Design PCBs with AI
Introducing a new way to work: Give Flux a job and it plans, explains, and executes workflows inside a full browser-based eCAD you can edit anytime.
Screenshot of the Flux app showing a PCB in 3D mode with collaborative cursors, a comment thread pinned on the canvas, and live pricing and availability for a part on the board.

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