Design of low-profiled broadband multi-frequency double-layer patch antenna

A novel low-profiled broadband multi-frequency double-layer patch antenna is proposed in this paper, which operates in GSM900, DCS1800 and Wifi. Considering the broadband, directivity, and low-profile of the antenna, seven patches with different resonant frequencies are placed together on one plane. These patches are arranged to have line polarization and are perpendicular to each other. By forming two patch antennas which have different resonant frequencies to the array, miniaturization and broadband can be realized. This structure not only avoids coupling but also takes full advantage of space. Simulation results show that good radiation performances and high gain are obtained owing to this novel design.