Millimeter-Wave Ultrawideband and Gain Enhancement Planar End-fire Antenna

A novel millimeter-wave ultrawideband and gain enhancement planar end-fire magneto-electric (ME) dipole antenna is presented in this paper. The antenna consists of an arched open cavity composed of substrate integrated waveguide (SIW) and an L-shaped turning patch. Impedance matching can be better achieved by adjusting the length of the L-shaped patch. The antenna has the characteristics with wideband of 56.3% (37.6-67.04 GHz) and gain of an average value of 5.1 dBi stable radiation patterns throughout the operating bandwidth with a peak gain of 5.9 dBi at 67.04 GHz. The proposed gain enhancement antenna structure has a smaller size relative to other end-fire antennas.