Ceramic resonators substrates and filters

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.