Low-Profile Transmitarray Antenna With Single Slot Source and Metasurface in 80-GHz Band

A low-profile transmitarray antenna with height of 29 mm and aperture size of 90 mm×90 mm is presented. It experimentally achieves above 32.4 dBi gain over an operational bandwidth (81–86 GHz). The use of a slot antenna as radiation source reduces the required distance between source and trans-mitarray, and a flat lens made of 6 conducting patterned sheets ensures that the incoming waves are in phase without strong frequency dependence, broadening the bandwidth. The antenna is fabricated through normal fabrication processes, such as milling processes for the chassis and printed circuit board fabrication processes for the transmittarray.