A Semiopen Substrate Integrated Horn Antenna With Dielectric Loading in 300 GHz Band

This study proposes a high-gain, broadband planar horn antenna that can be fabricated using standard printed circuit board technologies. The exponential tapering of the horn structure ensures wide bandwidth, while the semiopen structure and dielectric loading facilitate a smooth transition between the substrate-integrated waveguide and free space. A broadband transition between the substrate-integrated waveguide and the rectangular waveguide is also included for measurement purposes. The fabricated antenna exhibits an impedance bandwidth ranging from 220 to 303.3 GHz. With an end-fire radiation pattern, the antenna achieves a measured peak realized gain of 16.8 dBi, with a 3 dB beamwidth of 11$^\circ$ in the H-plane and 17$^\circ$ in the E-plane. This broadband, high-gain antenna is highly promising for operation within channel 68, as defined by the IEEE 802.15.3 d standard.