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Thin-film microstrip lines and a grounded coplanar waveguide using a cyclic-olefin copolymer as low-loss thin film have been fabricated and characterised up to 220 GHz. Attenuation as low as 0.6 dB/mm around 220 GHz has been measured on a grounded coplanar waveguide with a 22 µm-thick cyclic-olefin copolymer thin film.
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Peytavit et al. (2011) studied this question.
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