Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 11, Issue 3, Pages 269-276Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2021.3059335
Keywords
Absorption; Semiconductor device measurement; Frequency measurement; Atmospheric measurements; Mirrors; Broadband antennas; Silicon; Atmospheric attenuation; impulse radiator; on-chip antenna; SiGe BiCMOS; terahertz (THz) channel characterization; THz communication; water-vapor absorption
Funding
- National Science Foundation Career Award program
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In this study, a silicon-based THz pulse radiator chip was used to characterize a long-path THz communication channel, resulting in a broadband frequency comb and low-loss frequency windows. The experimental results are significant in terms of atmospheric absorption, channel path loss, and THz wireless links.
The terahertz (THz) band has opened up a new frontier for high-speed, wireless communication, high-resolution radars, and highly precise remote sensing. Identifying the low-loss atmospheric windows is vital for these applications. In this study, a long-path THz communication channel is characterized in the frequency range of 0.32-1.1 THz using a custom, silicon-based THz pulse radiator chip. The chip radiates 1.7-ps pulses via an on-chip antenna at a repetition rate of 8 GHz, resulting in a broadband 0.1-1.1 THz frequency comb. It is fabricated in 130-nm SiGe BiCMOS process and consumes 45 mW of dc power. A specular link was created using the impulse radiator, parabolic reflector antennas, a plane mirror, and a downconverter mixer. The THz channel was characterized up to a distance of 110 m. The measurement results demonstrate channel path loss, atmospheric absorption, and low-loss frequency windows suitable for wireless links in the THz range. The results correspond well with the HITRAN database [1].
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