Characteristics of built-in bent folded dipole antenna for handsets

A folded dipole antenna for handsets has already been introduced and analyzed as one of unbalanced feed antennas for handsets, which is very effective to mitigate the antenna performance degradation due to the body effect. To achieve lower profile of folded loop antenna, built-in folded dipole antenna, which has a structure folded loop elements sideway so that the antenna can be placed on the ground plane, has been proposed. In this paper, the parameters related to the feed structure are optimized in order to obtain a wider bandwidth for the built-in bent folded dipole antenna for handsets (BBFDA), and the fundamental performances are analyzed both theoretically and experimentally.