High-Precision Conductivity Measurement for Copper Foil up to 170 GHz
- consistently measure high-conductivity foils (σ > 0.8) with outstanding repeatability
- Evaluate both standalone copper and foil attached resin
- Obtain frequency characteristics across the band with fully automated measurements
The conductivity of copper foil is a critical factor in determining transmission loss in circuit boards. This becomes especially significant in the millimeter-wave range, where surface roughness can greatly affect conductivity, making direct measurement essential.
However, due to the lack of sufficiently capable measurement systems, it has traditionally been difficult to accurately evaluate the conductivity of copper foil on its own. As a result, engineers have had to fabricate transmission lines on actual substrates — a time-consuming process — in order to estimate losses, including dielectric loss and manufacturing variations such as etching errors.
EM labs have optimized the Fabry-Perot resonator specifically for conductivity measurements, making it possible to directly and reliably evaluate copper foil conductivity. This innovative solution dramatically improves the efficiency of developing low-loss, high-frequency circuit materials.
Watch and Learn: Conductivity Fabry-Perot Resonator
Simple to Use, Powerful in Performance — See It in Action!
Measurement Examples
Sample size
Recommended sample size (Square) [mm]
| resonator | Lower limit | Recommended | Upper limit |
|---|---|---|---|
| D band | 45 | 50 | 55 |
| BroadBand | 60 | 70 | 94 |
Recommended thickness
The maximum thickness for copper foil and metal plates is 2 mm. We recommend a thickness of at least three times the skin depth at the measurement frequency.
For copper foil with a dielectric layer, the dielectric thickness should be no more than 300 µm.
Example System Configuration
- Network analyzer: N5290A (Keysight Technologies)
- Conductivity Fabry Perot Resonator broadband 23- 110 GHz FP-CND-BB
- Software for Conductivity Fabry Perot Resonator FP-CND-MA
- Cables (1 mm)
- Windows PC
Products
| Product number | Product name | Connection |
|---|---|---|
| FP-CND-BB | Conductivity Fabry Perot Resonator broadband 23- 110 GHz | 1mm(f) |
| FP-CND-D | Conductivity Fabry Perot Resonator D-band 110 - 170 GHz | WR6.5 |