A novel double-layer rectangular microstrip antenna

In this paper, a novel double-layer rectangular microstrip antenna (DL-RMSA) is presented. It is fed by a microstrip line along the non-radiating edge of a bottom patch. Three or more slots are cut in the parasitic patch, respectively, in order to suppress TM_m0 mode radiation and cross polarization. The simulated and measured results indicate that the novel antenna presents the advantages of wider frequency bandwidth as compared to the classic DL-RMSA. Furthermore, this design simplifies feeding network and increases radiation efficiency in array applications. A small array of 8×8 elements is fabricated and tested. Excellent results are observed, including low crosspolarization and high radiation efficiency.