Simultaneous Gain and Bandwidths Enhance- Ment of a Single-feed Circularly Polarized Microstrip Patch Antenna Using a Metama- Terial Reflective Surface

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 SFCPMPA. 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. Corresponding author: S. Chaimool ([email protected]). 24 Chaimool, Chung, and Akkaraekthalin