Broadband microstrip patch antenna array using stacked structure

A stacked microstrip antenna with aperture coupling feeding as the individual radiator of the wide band antenna array is proposed. With adjusted parameters, it exhibits a broad impedance bandwidth (VSWR ≤ 2) of about 27% (8.8 GHz-11.6 GHz). Comprised by the proposed stacked antenna elements, a broad band 8 × 8 stacked microstrip antenna array is designed and fabricated. For improving the efficiency of the array, ingenious efforts have been made to achieve a simple feeding structure. The results show that the proposed antenna array has a broad impedance bandwidth of about 18%. Along with the broad impedance bandwidth, the gain of the antenna array is investigated and discussed.