A Waveguide Antenna Array Module with Controlled Element Pitch < 1λ for Sub-THz Communications

For sub-THz communication applications, we developed an antenna array module with element pitch less than 1 wavelength (1λ) at 300 GHz. The 1 × 4 waveguide-based antenna array module showed an antenna gain of 10 dBi and a beam steering angle of ±10° with reduced grating lobes. In addition, we developed a hybrid-interposer structure (lower side: heat dissipation/upper side: transmission layers) for the heterogeneous integration of an antenna array with power amplifiers. As a result, low-loss sub-THz transmission and high-efficient thermal dissipation were achieved simultaneously.