Planar Integrated MMW/THz Antennas Based on Higher-Order Mode Cavity and Printed Circuit Board Technology

In this paper, a planar substrate integrated MMW/THz antenna is presented using a higher-order mode feeding cavity and modified radiation apertures. The antenna is directly fed by a grounded coplanar waveguide (GCPW). The GCPW is separated into two slots at the terminal to respectively excite two parallel TE
201
resonant cavities and realize a 2×2 slot array. The antenna structure is improved using modified radiation apertures for the purpose of modified radiation patterns and higher antenna gain. A 60 GHz band antenna is fabricated and measured. The measured peak gain is 14.6 dBi with a 3-dB gain bandwidth from 53.2 to 65.8 GHz (21.2%). In addition, based on the proposed structure and printed circuit board technology, a THz band antenna is explored and designed with a 3-dB gain bandwidth of 24.4%, from 0.18 to 0.23 THz.