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Commensurate with the push toward next-generation (6G) wireless communications and sensing, branches of terahertz research have begun shifting from material, device, and simulation studies to more system-level, real-world demonstrations. Commercial mm-wave and terahertz instruments are beginning to reach a point where measurements can be made with realistic waveforms for validating channel models, signal processing schemes, and the performance of devices such as intelligent reflecting surfaces or beam manipulators, all of which are critically involved in communications, sensing, or their joint combination. Nevertheless, it remains challenging to implement functional systems that support broad bandwidths and terahertz carrier frequencies, simultaneously. Using a combination of commercial-off-the-shelf components, we present an integrated platform for studying terahertz applications, such as 6G communications and remote sensing, enabling up to 25 GHz of instantaneous bandwidth with any carrier frequency in the range of 75-500 GHz. The platform can generate arbitrary waveforms to accommodate a variety of applications and further contains a diverse suite of amplifiers, lenses, reflectors, and antennas to enable studies of long-distance terahertz communication, terahertz beam steering and shaping devices, and channel phenomenology. For two examples, we first present a demonstration of 20 Gbit/second wireless communication at 130 GHz between 50-180 m. Second, we present a demonstration of broadband terahertz communications at 300 GHz with up to 19 Gbit/second data rate to validate an artificial-dielectric-based beam scanning device.
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