Fast, Easy, and Accurate Conductivity Measurement from 10 to 40 GHz
- Ideal for detailed evaluation of copper foil for high-frequency substrates: relative conductivity above 0.8 can be measured with high repeatability.
- No transmission line fabrication is required. Conductivity can be measured using copper foil alone.
- Automated measurement enables simple and fast operation.
The conductivity of copper foil is an important factor in transmission loss for high-frequency substrates. In the microwave and millimeter-wave ranges, the effective conductivity of copper foil can vary significantly depending on surface roughness, making direct measurement essential.
Until now, practical evaluation of copper foil alone has been difficult because suitable measurement instruments were limited. Engineers often had to fabricate transmission lines on substrates and evaluate the total loss, including dielectric loss, which required considerable time and effort.
EM labs has optimized the split-cylinder resonator for conductivity measurement, enabling evaluation of copper foil conductivity. This approach helps improve the efficiency of low-loss substrate development.
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Watch and Learn: Split-Cylinder Resonator
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Technical documents are available here, including details on the measurement principle and application examples.
Measurement Examples
Conductivity Measurement of Copper Foil (10 - 170 GHz)
Comparison of copper foils with different surface roughness using split-cylinder and Fabry-Perot resonators.
Conductivity Comparison of Smooth Metals (10 - 110 GHz)
Conductivity measurement of non-roughened metals using split-cylinder and Fabry-Perot resonators.
Sample Size
Recommended sample size (Square, mm)
| Resonator | Lower limit | Recommended | Upper limit |
|---|---|---|---|
| 10 GHz | 60 | 80 | 94 |
| 20, 28, 40 GHz | 45 | 50 | 55 |
For measurement services: Samples that can be cut with a utility knife can also be cut by EM labs. Please send the material in a larger size, such as A4.
Recommended sample thickness
The maximum thickness for copper foil and metal plates is 2 mm. There is no strict minimum thickness, but we recommend a thickness at least three times the skin depth at the measurement frequency.
Example System Configuration
- Keysight PNA Millimeter-Wave Test System N5290A (110 GHz)
- Split-Cylinder Resonator for Conductivity 28 GHz: CR-CND-028
- Conductivity measurement software: CR-CND-MA
- 2.92 mm connection cables
- Windows PC
Products
| Product No. | Product Name | Connection Connector |
|---|---|---|
| CR-CND-010 | Split-Cylinder Resonator for Conductivity 10 GHz | 2.92 mm (f) |
| CR-CND-020 | Split-Cylinder Resonator for Conductivity 20 GHz | 2.92 mm (f) |
| CR-CND-028 | Split-Cylinder Resonator for Conductivity 28 GHz | 2.92 mm (f) |
| CR-CND-040 | Split-Cylinder Resonator for Conductivity 40 GHz | 2.92 mm (f) |
Documents
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You are welcome to contact us even if your application or measurement conditions are not yet finalized. We can help with product selection, system configuration, and contract measurement services.