A Sensing Demonstration of a Sub THZ Radio Link Incorporating a Lens Antenna

Abstract

We demonstrate that the future sixth generation (6G) radio links can be utilized for sub-THz frequency imaging using narrow beamwidth, high gain, lens antennas. Two different lenses, a bullet or hemispherical shape, were used in radio link setup (220-380 GHz) for an imaging application. Lenses performed with the gain of 28 dBi, 25 dBi, and the narrow beamwidths of 1 • and 2.5 • . Plants were used as imaging objects, and their impacts on radio beams were studied. For assessment, the radio link path loss parameter was −48.5 dB, −53.2 dB, and −57.1 dB with the frequency 220 GHz, 300 GHz, and 330 GHz, respectively. Also, the impact of the radio link distance on the imaging was studied by 50 cm and 2 m link distances. In addition, the 3D image was acquired using the phase component of the image, and it showed the leaf surface roughness and the thickness, which was similar to the measured value.

Porous Low‐Loss Silica–PMMA Dielectric Nanocomposite for High‐Frequency Bullet Lens Applications

“…Of the latter, we may distinguish heterogeneous and homogeneous lenses depending on whether the refraction of the waves occurs within the bulk or on the surface of the dielectric lens. [ 8,9 ] Regardless of the type of the lens, the material it is made of is expected to have low loss (tan δ ) to avoid signal attenuation. [ 10 ] Lens materials of high permittivity ( ε r ) allow for relatively thin lens designs with small surface curvatures but necessitate the use of gradient structures in the proximity of the surface to minimize reflection losses.…”

Lens antenna adjustment for telecommunication and imaging modes in a sub‐THz radio system

“…[16][17][18][19][20][21][22][23] Imaging at 300 GHz was presented in the short (50 cm) and long (2 m) range using fixed lens positions. 24 In telecommunication, lenses are typically fixed to have maximum gain 25 between transmitter and receiver. This means that the object between transmitter and receiver is not in focus.…”