The “dielectric layer” in a coaxial cable is an insulating material that separates the inner conductor from the outer conductor (shield) of the cable. It plays a crucial role in maintaining the electrical integrity of the cable by preventing electrical contact and short-circuits between the two conductors. The dielectric layer also helps maintain the characteristic impedance of the cable, which is essential for proper signal transmission and reducing signal loss. Different types of dielectric materials can be used in coaxial cables, including foam, solid polyethylene, and other insulating materials. The choice of dielectric material can impact the cable’s performance in terms of signal quality, bandwidth, and attenuation.