Dielectric holds more patents than any other antenna manufacturer in the world—some from as far back as 1942, others so new, they’re still in John’s “active” file.
Dielectric, insulating material or a very poor conductor of electric current. When dielectrics are placed in an electric field, practically no current flows in them because, unlike metals, they have no loosely bound, or free, electrons that may drift through the material.
When a dielectric is placed between charged plates, the polarization of the medium produces an electric field opposing the field of the charges on the plate. The dielectric constant k is defined to reflect the amount of reduction of effective electric field as shown below.
In a dielectric, the charges are valence electrons that are stuck inside atoms of a crystal or polymer, and so current doesn’t flow at all. The electric field, however, still exerts a force on the charges.
Such substances are called dielectrics, and they actually provide an effect similar to what is seen in conductors, though it is not extreme enough to completely cancel the field. Start with a slab of neutrally-charged dielectric located between two neutrally-charged conductor plates.
A dielectric is a type of insulating material that allows very little or almost no electric current to flow through it. When a dielectric is placed in an electric field, it does not permit the movement of free electrons like metals do, because it lacks loosely bound electrons.
In general, a dielectric is an electrical insulator with high permittivity, which means with high polarizability. Dielectrics have many applications, but the most significant use is in capacitors. In many capacitors, there is an insulating material such as paper or plastic between the plates.
A dielectric material is defined as an electrical insulator that can be polarized by an applied electric field.