for Successful Material Measurements
Permittivity, permeability, and conductivity measurements in the microwave and millimeter-wave ranges require appropriate methods depending on the application. EM labs develop, manufacture, and sell measurement fixtures and systems based on the methods listed below, and also offer contract measurement services.
Solution for Permittivity and Permeability Measurement
We offer two main types of measurement systems, each based on a different method. Each system is optimized for specific types of materials, allowing for accurate and appropriate measurements depending on the material.
S parameter method
The S-parameter method (free-space method) is used to acquire S-parameters, from which permittivity and permeability can be calculated. It is well-suited for measuring materials with relatively high loss (typically tanδ > 0.01). Since it provides continuous data across a frequency band, it is effective for evaluating frequency-dependent characteristics.
In addition to permittivity and permeability, it also enables evaluation of transmission, reflection, and absorption. With the free-space setup, measurements such as oblique reflection characteristics of absorbers are also possible. The S-parameter method is highly suitable for assessing the transmission properties of materials.
| Products | Frequencies [GHz] | Material shape |
|---|---|---|
 Free-Space | 18~330 | Board, Liquid |
 Sample Holder (APC7) | 0.5~18 | Donut-shape, Powder |
 Sample Holder (Wave guide) | 8,2~40 | Cuboid |
Resonator method
Permittivity measurement using resonator methods offers high accuracy and is especially well-suited for evaluating low-loss materials (typically with tanδ < 0.01). Measurements are performed at the resonant frequency. Cavity resonators and split-cylinder resonators allow measurement at a single frequency per resonator. In contrast, the Fabry–Perot resonator can generate resonances at intervals of 2.5 GHz, enabling measurements at multiple frequencies with a single device and allowing for evaluation of frequency characteristics.
Note: Resonator methods are not suitable for measuring permeability, transmission, reflection, or absorption.
| Products | Frequencies [GHz] | Material shape |
|---|---|---|
 Cavity resonator | 1, 2, 2.45, 3, 5, 5.8, 10 | Rod-shaped, Strip-shaped film, Powder, Liquid |
 Split cylinder resonator | 10, 20, 24, 28, 35, 40, 50, 60, 80 | Film, Multilayer, Liquid |
 Fabry-Perot resonator | 25~330 *1 point per 2.5GHz step | Film, Multilayer, Liquid |
Solution for Conductivity Measurement
By applying and optimizing the technologies of split-cylinder and Fabry–Perot resonators originally used for permittivity measurement, we have made it possible to evaluate the conductivity of copper foil.
| Products | Frequencies [GHz] | Material shape |
|---|---|---|
 Split-cylinder resonator (conductivity) | 10, 20, 28, 40 | Copper foil, Metal plate |
 Fabry-Perot resonator (conductivity) | 23~170 *1 point per 2.5GHz step | Copper foil, Metal plate, Copper foil with resin |
Purchasing Our Fixtures?
EM labs is a proud authorized solution partner of Keysight Technologies. Our fixture solutions are available for purchase and support through Keysight’s global sales channels. If you do not have an existing Keysight sales contact, please visit this link and provide the following information.
