Design of Large-Band Highly Directive Antenna in the Millimeter Waves Range at 80 GHz

摘要

This paper presents the design of a broadband highly directive antenna developed for point-to-point communications systems in the millimeter-wave band around 80 GHz (E-band domain). High directivity (about 38 dBi) and very few degrees opening angle are required for this application from 81 to 86 GHz. A Fabry-Perot cavity excited by primary source array (N×N standard WR12 waveguides) is coupled to a metamaterial dual-layer partially reflective surfaces (PRS). The designed PRS is used as a transmitting window and optimized in order to achieve a positive gradient phase (PGP) of the reflection coefficient over the entire considered bandwidth (≈5GHz). The goal is to compensate, even partially, the delay due to multiple interference paths in order to maintain the cavity resonance condition. The dimensions of the planar antenna are 100×100 mm~2. The full wave numerical results show a positive linear gradient phase (PGP) of about 13 ° and a quasi-unchanged directivity with a peak value of about 38 dBi. The designed antenna is highly directive, ultra-compact and low profile with good performances over the entire E-band 81-86 GHz.