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 E-20 E-11 E-80 E-38 E-10 E-9
 Products   Cylinders
Substrates
Coaxial, Cylinders
Substrates
Coaxial
Cylinders
Coaxial
Cylinders
Coaxial
Cylinders
Special parts
(Alumina 99)
Substrates
(Alumina 96)
 Permittivity εr 37 1 20 1 11.5 1 82 2 38 1 9.5 0.5 8.5 1
 Unloaded Q-factor Q0 (at 10 GHz, *3 GHz) 4 500 4 500 5 000 * 2 500 4 800 7 000 * 2 000
 Temperature
 coefficient
TCF (ppm K-1) +2 1 +2 2 -40 5 +4 2 +2 2 na na
 Density ρ (g cm-3) 5.1 3.7 3.5 5.7 5 3.8 3.7
 Insulation resistivity r (Ω cm) 1013 1013 1013 1012 1013 1014 1014
 Thermal expansion TCL (ppm K-1) 7.5 8 8.5 8.5 7.5 8 8
 Thermal conductivity λ (W m-1 K-1) 2.5 7 3 3 2.5 25 20
 Color   greygreen beige ivory brown honey white white


Temperature coefficient can be changed for E-37 and E-11 on a special request.