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IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

High-T c Superconducting Josephson Mixers from X- to Sub-THz Band

He Zhu, Ting Zhang, Jia Du

Published Jul 1, 2026• 0 citations
Publisher
DOI
10.1109/imws-amp68843.2026.11684323

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High temperature superconducting (HTS) Josephson junction (JJ) mixers are attractive candidates in receivers for terahertz (THz) communication due to their high sensitivity, wide bandwidth, low local oscillator (LO) power requirement and high harmonic numbers. The required LO frequencies and the cost can be greatly reduced when harmonic signals can be detected at high orders (more than 100). In this paper, up to 114thharmonic mixings is presented in a HTS bicrystal YBa2Cu3O7-δ(YBCO) JJ harmonic mixer coupled with a bowtie loaded meander antenna at 0.21 THz. HTS JJs will be promising high-order harmonic mixers for THz practical applications on reception or detection at THz bands.
We present results of a systematic work towards components for an integrated high-T/sub c/ receiver. As a local oscillator, which is necessary for heterodyne detection, the array type of the multi junction superconducting loop (MSL) was investigated. We observed the phase locking of all junctions by means of dc-measurements. At the same time the radiation of the array was detected using a detector junction coupled to the array. Phase locking of all junctions was achieved up to nearly 1 THz. Furthermore, the results of heterodyne mixing experiments in the W-band using single high-T/sub c/ grain boundary junctions are presented. The possible integration of Josephson oscillator and mixer into a single circuit is discussed.
Abstract This paper presents a wideband terahertz (THz) mixer based on a thin-film antenna-coupled high-temperature superconducting (HTS) YBa 2 Cu 3 O 7−x (YBCO) step-edge Josephson junction. The HTS mixer enables the flexible harmonic mixing operation at multiple THz bands with the same microwave local oscillator (LO) source, and features very wide intermediate-frequency or instantaneous bandwidth. In order to optimize the frequency down-conversion performance of the mixer, systematic electromagnetic design and analysis have been carried out to improve the power coupling of THz radiation as well as wideband transmission of microwave signals. Experimental characterization of a fabricated device prototype has demonstrated that the mixer exhibits good performance at both the 200 GHz and 600 GHz bands. Detailed measurement results including the DC characteristics, LO pumping requirement, frequency response, mixing linearity and conversion gain are presented in this paper.