Patent ID: 7602350

Claim:
A dielectrically loaded mutifilar helicalantenna for operation at a frequency in excess of 200 MHz comprising: an electrically insulative core having a central axis and made of a solid dielectric material which has a relative dielectric constant greater than 5 and which occupies the major part of the interior volume defined by the core outer surface first and second coextensive generally helical conductors that are in an opposing configuration with respect to each other on a side outer surface portion of the core and, located on an end surface of the core, a pair of feed connection nodes and a connection structure connecting the helical conductors to the feed connection nodes, wherein the connection structure comprises, as a conductive coating of the said core end surface, first and second conductive paths between, respectively, the first helical conductor and one of the feed connection nodes, and the second helical conductor and the other feed connection node, the connection structure further comprising a series reactive link in the first conductive path and a shunt reactive link interconnecting the feed connection nodes, one of the reactive links being inductive and the other being capacitive to form a matching network.