Circularly polarized metallic EBG antenna

Dual-band metallic FSS-EBG sectoral antenna

“…They have low side lobes and are compatible with the radiation of circular polarization [6]. A highly reflective FSS is used as the substrate for a resonant cavity fed by a patch array to create a dual frequency band.…”

Transmission Phase Characterizations of Metamaterial Covers for Antenna Application

“…Consequently, the second layer (polarizer layer) can be replaced with another metamaterial cover layer, which in turn results in higher directivity. Moreover, in contrast to the previous directive circularly polarized antennas [10][11][12][13], polarization state of the directive antennas using our proposed metamaterial cover can be mechanically changed regardless of the feed mechanism. In this paper a useful guideline has been established as how to use the magnitude and phase of the transmission coefficient to identify the operational frequency band of the directive circularly polarized antennas based on polarization dependent metamaterial covers.…”

“…To obtain directive circularly polarized antenna, various types of metamaterial antenna have been proposed in the literature [10][11][12][13]. It was demonstrated in [10,11] that the directive circularly polarized antenna can be realized by metamaterial antenna with a circular feed.…”

“…In other words, the polarization state of the antenna is only determined by the feed mechanism. Directive circularly polarized antenna can be also realized using either metallic wire polarizer [12] or meander line polarizer [13] stacked on the top of the one-layer metamaterial cover.…”

Closely coupled triple layer hybrid FSS/EBG for increased directivity

“…Recently, EBGs have also been demonstrated as superstrates that enhance antenna gain [1,2]. This letter describes a class of novel electrically thin superstrate for application to microstrip or wire antennas on ground planes that enhance the gain or directivity.…”