[22a-A306-1~9] 11.4 Analog applications and their related technologies

[22a-A306-9] Transmission Measurement of Superconducting Rectangular Waveguide using Niobium in the 100-GHz Band

〇Taku Nakajima¹, Suzuki Kazuji¹, Kojima Takafumi², Uzawa Yoshinori², Ishino Masayuki³, Watanabe Issei⁴ (1.Nagoya Univ., 2.NAOJ, 3.KMCO, 4.NICT)

Keywords:Superconducting Waveguide, Millimeter/sub-millimeter Wave, Radio Telescope

We have developed a superconducting Niobium rectangular waveguide and measured its propagation loss in the 100 GHz band for confirmation of effectiveness to reduce the transmission attenuation. The transmission characteristics of Niobium, Aluminum alloy, and tellurium copper resonator waveguides were measured in cryogenic temperature, and the electrical conductivities were estimated based on the obtained Q-factors with resonator method. As a result, we found that the attenuation of the Niobium waveguide is 1/20-1/30 lower than that of normal metals.