A dielectrically-loaded loop antenna with a cylindrical dielectric core, a feeder
structure passing axially through the core, a sleeve balun encircling one end portion
of the core and helical antenna elements extending from a feed connection with
the feeder structure at the other end of the core to the rim of the balun. The
antenna elements are arranged as a pair of laterally opposed groups of conductive
elongate helical elements each having at least first and second conductive elements
of different electrical lengths to form a plurality of looped conductive paths.
By forming at least one of the conductive elements in each group as a conductive
strip with one or both edges meandered, such that the edges of the strip are non-parallel
and have different electrical lengths, additional modes of resonance arc created,
yielding an improvement in bandwidth.
