A Wideband Square-Slot Antenna Array With Superstrate and Electromagnetic Bandgap Reflector for 60-GHz Applications

A 1 × 4 antenna array with wideband and high gain is proposed for 60-GHz applications. The operating bandwidth is from 57 to 66 GHz. A superstrate above and an electromagnetic bandgap reflector below the array structure increase peak gain and decrease backward radiation, respectively. This paper elaborates the design guidelines. The slot stubs are designed appropriately to increase the bandwidth of squareslot antenna and maintain the radiation pattern. The simulated and measured impedance bandwidth (|S
₁₁
| ≤ -10 dB) are 28.8% (52.6-69.9 GHz) and 23.2% (52.6-66.5 GHz), respectively. The peak antenna gain ranging from 57 to 66 GHz is simulated to be 14.2-12.4 dBi, while the measured peak gain at 57, 60, 63, and 66 GHz are 13.6, 13.4, 12.6, and 11.3 dBi, respectively. The above results can satisfy requirement of many commercial applications.