( Radio Frequency ): UHF, VHF, Shortwave, Microwave, etc.
Dielectrics Include: A vacume (best
), to varying degrees of dielectric properties: air, glass, ceramics, plastics, oils, etc.
Dielectrics used in communications
industry include: Coaxial cable core, Various teflon and other plastic parts used in coaxial connectors, Dielectric greases, Hollow
or solid; plastic or ceramic waveguides, Potting fill materials used inside various splitters and groundblocks, Snow cover materials
for dishes, Rock camouflage
cover for dishes, etc.
Note on Dielectric Greases:
Often it is stated that using a dielectric
grease on a coaxial or electrical connection will impede electrical throughput. If the dielectric is viscous, it will move
out of the way of the electrical contact surfaces and occupy only space that was once occupied by air : A
Example: Common practice is to put grease ( a dielectric) on car battery terminals. The grease is
extruded away from the electrical contacting surfaces when re-assembling, allowing electrical throughput,
while protecting the terminals from corrosion.
Hope this information answered you questions.