Common
thermoplastics, namely, polycarbonate (PC), poly (methyl methacrylate) (PMMA),
and acrylonitrile butadiene styrene (ABS) are low-cost materials with potential
applications in emerging 6G communications systems, ranging from
microelectronics packaging to metasurfaces for reflectors and filters. In addition,
low-loss materials are also needed for more pedestrian applications, such as
packaging for entire handheld devices, subassemblies, and high-frequency
windows where low-cost is key and long lifetime might not be a requirement. In
this work, we utilize terahertz time-domain spectroscopy from 500 GHz to 2 THz
to characterize the dielectric properties and loss tangent for each
thermoplastic above. The plastics investigated have refractive index (∼ 1.6–1.7) in the 6G band with low
dispersion. The absorption, however, increases at high frequencies as is common
in disordered materials, highlighting a key challenge for 6G. Nonetheless, in
absolute terms, all the thermoplastics studied present low-loss performance
compared with (higher–index) common glasses and ceramics within the entire
frequency range, suggesting that they are promising candidates for selected
applications for future 6G systems.
… The transmission measurements in this work were performed
using a commercial pulsed broadband THz time-domain spectroscopy (TDS) system (TPS Spectra 3000 from TeraView Ltd, UK). Compared to vector network analyzers (VNA),
another …
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