Characterization of a compact wideband microwave metasurface lens for cryogenic applications

Al-Moathin, Ali and Zhong, Mingyan and Al-Taai, Qusay and Jiang, Yunan and Farage, Michael and Kazim, Jalil ur Rehman and Ali, Muhammad Zulfiqar and Nikbakhtnasrabadi, Fatemeh and Powell, Megan and Khatri, Prince and Stanley, Manoj and Rossi, Alessandro and Heidari, Hadi and Imran, Muhammad Ali and Abbasi, Qammer H. and Ridler, Nick M. and Weides, Martin and Li, Chong; (2023) Characterization of a compact wideband microwave metasurface lens for cryogenic applications. In: 101st ARFTG Microwave Measurement Conference. ARFTG Conference . IEEE, Piscataway, NJ. ISBN 9798350323450 (

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In this paper, we present characterization of a compact flat microwave lens operating between 6 GHz and 14 GHz using a near field scanning system. An X-band horn antenna and open-end rectangular waveguide were used as an illumination source and probe, respectively. |S21| is measured as the probe antenna moves on a plane orthogonal to the optical axis vertically and horizontally. The lens is made of a metasurface layer that is sandwiched by two layers of cross-oriented gratings. The overall dimension of the lens is 10 cm in diameter and 0.57 cm in thickness. The measurement results show that the lens's focal length is 8 cm, and the beamwidth (full width at half maximum (FWHM)) is 3.5 cm, A transmission efficiency of over 90% and a cross-polarization gain of 25 dB were achieved over the entire bandwidth. The measurement results at room temperature are in good agreement with numerical simulations. The proposed lens will be used in a cryogenic environment e.g. dilution refrigerators for quantum computing systems. More results at cryogenic temperature e.g, below 30 K will be shown at the conference.