Abstract
The high temperature superconductor (HTS) dual-band bandpass filter (DB-BPF) has been developed for microwave intermediate frequency (IF) signals (8-12 GHz) of a multi-frequency millimeter-wave atmospheric spectrometer. The HTS DB-BPF consists of 6-pole and 12-pole BPFs with an 8.348 GHz center frequency and 0.27 GHz band width and an 11.156 GHz center frequency and 1.46 GHz band width, respectively. The HTS DB-BPF was fabricated using YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><sub>y</sub></i> thin films on R-Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> substrate. Fabricated DB-BPF is evaluated by experiment and simulation with good agreement. We started the long-term monitoring of atmospheric molecular species using DB-BPF at Syowa station in Antarctica.
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