The amount of dielectric coating applied, type of dielectric material selected, and method of application is a matter of {HEAD ~ design choice} which depends on {TAIL ~ the level} of D.C. blockage desired and the desired operable RF frequency range 
The amount of dielectric coating applied , type of dielectric material selected , and method of application is a matter of { HEAD ~ design choice } which depends on { TAIL ~ the level } of D.C. blockage desired and the desired operable RF frequency range
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH