Enhanced efficiency in terahertz SIW array antennas

In this paper, a terahertz slotted waveguide array antenna based on a substrate integrated waveguide (SIW) is proposed. The terahertz waves are fed from the rectangular waveguide (RWG) at the bottom of the antenna, coupled to slotted waveguide array through RWG-SIW transition. The proposed RWG-SIW transition realizes the vertical transfer from RWG to SIW and feeds the slotted waveguide array. The proposed slotted waveguide array antenna demonstrates a -10d B impedance bandwidth ranging from 236.5 to 248.8 GHz, achieving a peak gain of 13.2 dBi and a maximum radiation efficiency of 87%. The terahertz slotted waveguide array antenna can be used in terahertz communication, terahertz imaging, and other fields.