Simultaneous Gain and Bandwidths Enhancement of a Single-Feed Circularly Polarized Microstrip Patch Antenna Using a Metamaterial Reflective Surface

Abstract

Abstract-This paper proposes a metamaterial reflective surface (MRS) as a superstrate for a single-feed circularly polarized microstrip patch antenna (SFCP-MPA). It illustrates a simultaneous enhancement on antenna gain, impedance bandwidth (ZBW) and axial-ratio bandwidth (ARBW) by adding the MRS atop the SFCP-MPA. The MRS can enhance the ZBW and ARBW by 3.5 and 9.9 times, respectively, compared to the circularly polarized patch source. Moreover, the gain of the CP-MPA with the MRS is 7 dB higher than that of the conventional CP-MPA. The small spacing between the MRS and patch source is another merit in the present design, which is as low as λ • /16, as it results in a low-profile antenna design that well suits modern wireless communications.

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. A major limitation of this method is inability to tune mechanically.…”

Design of Slotted Ground Hexagonal Microstrip Patch Antenna and Gain Improvement With FSS Screen

“…FSS, in contrast to the EBG has low profile and hence is a better candidate for the gain enhancement of antenna [8]. FSS can also be used to improve the bandwidth [9][10][11]. In addition, FSS superstrate is also used as a polarizer to get circular polarization in case of single source excitation [12,13].…”

A Circularly-Polarized Metasurfaced Dipole Antenna With Wide Axial-Ratio Beamwidth and RCS Reduction Functions

“…Based on the design of a metamaterial reflective surface presented in [15], analogous metasurface whose unit cell consists of a rectangular loop with a diagonal microstrip was placed close to a source antenna to convert the linearly polarized signal generated from the source into a circularly polarized one [16,17]. Broadband circular and linear polarization conversion has been reported by using thin birefringent reflective metasurfaces, which are composed of two orthogonal I-shaped structures placed on a substrate with a grounded sheet [18].…”

“…In this paper, we intend to utilize the metasurface proposed in [5], which was in fact the shear deformation of that used in [10,[15][16][17], to design a circularly polarized antenna and mainly focus on the wide AR beamwidth and RCS reduction performances. In order to make the designed antenna work in C-band for satellite communications, the geometrical parameters of the metasurface used in [5] are redesigned.…”