FOAM FILLED DIELECTRIC ROD ANTENNA

摘要

An antenna combination (200) includes a feed-through (3') having an input side including a connector (115) for coupling to a transmission line connector (2) and an output side including an inner cavity (9) attaching to an aperture (51) in a top surface or a nozzle of a tank (40). A foam filled dielectric rod antenna (5) is coupled to the output side of the feed-through having a nose portion (5a) including a sub-portion within the inner cavity and a rod-shaped portion (5b) from beyond the inner cavity to an antenna launch end. The rod-shaped portion includes an outer solid dielectric material (5b1) including a thickness transition region, wherein a thickness of the solid dielectric material decreases toward the antenna launch end to a constant minimum thickness shell region that extends to the antenna launch end. The outer solid dielectric material defines an inner hollow region (5b2). A dielectric foam fill material fills the inner hollow region.