Abstract
AbstractThis article presents a concept of a dual‐mode operated sub‐THz frequency radio system by adjusting the lens‐antenna distance for either telecommunication or imaging modes. The signal transmittance and imaging capabilities are demonstrated using a continuous wave operated transceiver with operation frequency 220 to 330 GHz where the 6G wireless radio system could be allocated. A high‐gain bullet‐shape lens antenna was investigated for imaging the natural object (Bergenia leaf) in the short‐range line‐of‐sight radio link. The bullet lens performed with the gain of 28 dB and the 1° beamwidth over the frequency band. For the demonstration of dual‐mode operation, the leaf was placed into the middle of the radio link path and then its image was synthesized at three lenses to the antenna‐distances by utilizing the inverse synthetic‐aperture radar technique. For image synthesizing, the movement pattern area (100 mm × 100 mm) is defined with 5 mm steps to sweep the object area. Three 100 mm × 100 mm images by 5 mm steps from different lens positions in focal axis distances (4, 15, and 30 mm were synthesized. The comparison shows that 15 mm distance has the highest gain and 30 mm distance has the higher image quality. Therefore, there is the possibility to switch from the high gain low‐resolution mode to the low gain high‐resolution mode by changing the lens position in terms of the feed. The imaging feasibility can be applied at 6G radio systems if adjustable lens systems are used revealing the new potential features in future radios.
Highlights
There has been wide research activity in the field of sub-THz telecommunication and imaging fields presenting different sort of applications for security screening and spectroscopy areas
Been proposed for the candidate of the 6G communication systems that allowing as a high speed as terabit per second
To reach the narrow beamwidth and high gain the elliptical geometry was applied for lens[1,31] and the bullet-shaped lens antenna was designed by CST microwave Studio[32] at a center frequency of 300 GHz
Summary
There has been wide research activity in the field of sub-THz telecommunication and imaging fields presenting different sort of applications for security screening and spectroscopy areas. Experimental research has been carried out on the long-range radio link with frequency 300 GHz, the parabolic lens antenna around 55 dB was implemented to provide high bit rate communication for two long distances (500 m and 1 km).[7] Lens antenna with a narrow beam and high directivity has been earlier presented to synthesize image[8] and accurate localization[9] already. A concept of a dual mode operated sub-THz frequency radio system by adjusting the lens-antenna distance for either telecommunication or imaging modes is presented.
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