Basic material characteristics
Ceramic materials with high permittivity, high Q and very good temperature stability are useful for TEM mode coaxial resonators, TE mode dielectric resonators, RF filters, special capacitors and dielectric substrates for microwave circuits. Frequency range: from 0.3 GHz to 24 GHz.
| Symbol (Unit) | Material | |||||||
|---|---|---|---|---|---|---|---|---|
| E-37 (obsolete) | E-20 | E-11 | E-80 | E-38 | E-10 | E-9 | ||
| Products | Coaxial, Cylinders Substrates |
Coaxial, Cylinders Substrates |
Substrates, Supports | Coaxial, Cylinders | Coaxial, Cylinders | Special parts (Alumina 99) |
Substrates (Alumina 96) |
|
| Permittivity | εr | 37 ± 2 | 20 ± 2 | 11.5 ± 1 | 82 ± 2 | 38 ± 2 | 9 ± 1 | 8 ± 1 |
| Unloaded Q-factor | Q0 (at 10 GHz) | 4 500 | 4 500 | 5 000 | 3 000 | 4 800 | 7 000 | 2 000 |
| Temperature coefficient |
TCF (ppm K-1) | +2 ±1 | +2 ±2 | -40 ±5 | +4 ±1 | +2 ±2 | na | na |
| Density | ρ (g cm-3) | 5.1 | 3.7 | 3.5 | 5.7 | 5 | na | na |
| Insulation resistivity | r (Ω cm) | 1013 | 1013 | 1013 | 1013 | 1013 | 1013 | 1013 |
| Thermal expansion | TCL (ppm K-1) | 7.5 | 8 | 8.5 | 8.7 | 7.5 | na | na |
| Thermal conductivity | λ (W m-1 K-1) | 2.5 | 7 | 3 | 3 | 2.5 | na | na |
| Color | greygreen | beige | creamwhite | brown | honey | white | white | |
Temperature coefficient can be changed for E-37, E-20 and E-11 on a special request.