One-Sided Directional Slot Unit and its Array Antenna with AMC Reflector for 5G N257 Band Applications

In this paper, a slot antenna unit and a 1×2 compact slot array antenna with Artificial Magnetic Conductor (AMC) reflector, working for 5G N257 band (26.5-29.6GHz), are proposed. For the slot antenna unit, there is a floating metal print on the bottom of the substrate, which is playing a role as a matching network to help enlarge the bandwidth. In addition, an AMC reflector that resonated at 26 GHz is used to decrease the backward radiation and enhance the realized gain, simultaneously. In array antenna design, another slot antenna unit of the same size with a distance of 0.5λ, is presented to obtain sharper radiation and higher gain. The antenna unit serves in bandwidth from 26.17GHz to exceed 30GHz, one side (+z direction) radiation pattern is obtained with a gain range from 3.84dBi to 7.11 dBi in 5G N257 operations. The 1×2 array antenna keeps the same bands with the unit, from 26.54GHz to 29.91GHz with a peak gain, 10.1dBi. The results provide a competitive strategy of antenna unit and compact array design for one-side directional 5G mm-wave antennas.