A quasi-Yagi antenna is developed to operate at 2.4GHz (ISMband) presenting a low profile and off-axis radiation when packaged\nover ametal ground plane.Theoff-axis radiation is realized by incorporating a Jerusalem cross frequency selective surface (JC-FSS)\nas the ground plane for the antenna. A JC-FSS is preferred because of its frequency stability in the operating band for a large angular\nspectrum (?70?) of TE- and TM-polarized incident waves. In this research, the substrate of the antenna flush-mounted on top of\nthe FSS is added to the JC-FSS model and allows for a smaller cell grid. The prepared quasi-Yagi antenna over the JC-FSS offered\n260MHz of functional bandwidth and 54? of beam tilt towards the end-fire direction. To the best of the authors� knowledge this\nis the first instance that these two structures are combined for off-axis radiation. Additionally, to support the preferred use of the\nJC-FSS, the quasi-Yagi is backed by a square patch (SP) FSS for comparison purposes.
Loading....