Ceramics Constant K

The range of ks for common ceramic dielectrics is shown in table 15.

Ceramics constant k.

While the data in these charts is in most cases typical of what you will find from ceramic component suppliers it is only intended to be a general point of reference and should not be used for material selection or specification. Beryllium oxide is widely used in aerospace nuclear power metallurgical engineering electronics industry rocket manufacturing and so on. 6 cheap shielded cables are often made with this stuff but these are only suitable for audio frequencies or low rate data communications. The dielectric constant k and loss factor tan d can be measured using a standard impedance bridge or an impedance analyzer both of which provide a direct reading.

The more resin the lower the k. We have collected a number of charts detailing applications and properties for some of the most commonly used ceramic materials. The loss factor represents the ratio of resistance to reactance of a parallel equivalent circuit of the ceramic element figure 3. 5 varies somewhat by exact resin content.

Measurements are generally carried out at 1 khz. The relative dielectric constant k is the ratio of the amount of charge that an element constructed from the ceramic material can store relative to the absolute dielectric constant 0 the charge that can be stored by the same electrodes when separated by a vacuum at equal voltage 0 8 85 x 10 12 farad meter. Usually they are metal oxides that is compounds of metallic elements and oxygen but many ceramics.