A Superconducting Dual-Band Bandpass Filter for IF Signals of Multi-Frequency Millimeter-Wave Atmospheric Spectrometer

Sakuma, Kei; Rachi, Sota; Mizoguchi, G.; Nakajima, Taku; Mizuno, Akiko; Sekiya, N.

doi:10.1109/tasc.2023.3254482

IEEE Trans. Appl. Supercond.

2023

DOI: 10.1109/tasc.2023.3254482

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A Superconducting Dual-Band Bandpass Filter for IF Signals of Multi-Frequency Millimeter-Wave Atmospheric Spectrometer

Kei Sakuma

Sota Rachi

G. Mizoguchi

et al.

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2024

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Cited by 2 publications

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K-band dual-band superconducting bandpass filter using uneven coupled SIRs and stub-loaded combining network

Chen,

Ren,

Yang

2024

Supercond. Sci. Technol.

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A K-band millimeter dual-band superconducting filter with uneven coupled step-impedance resonators (SIRs) and stub-loaded combining network is proposed in this paper. The novel uneven internally coupled SIR introduces a notch to the classical internally coupled SIR, enhancing the Q-factor for narrow-band filter design. The performance of the uneven coupled SIR is theoreticallyanalyzed, and two single-passband superconducting filters based on the proposed resonator are designed and demonstrated its high Q-factor. A novel stub-loaded combining network is then investigated theoretically to integrate the two single passband filters into a dual-band filter. To validate the design concept, a dual-band superconducting filter is designed on a magnesium oxide (MgO) substrateusing the yttrium barium copper oxide (YBCO) superconducting film. The measured results reveal insertion losses of 0.91-1.2 dB of the first passband at 24.21-24.41 GHz with the bandwidth of 0.82% and 0.43-1.3 dB of the second passband at 24.67-25.2 GHz with the bandwidth of 2.12%, respectively. Both passbands exhibit return loss levels exceeding 8 dB, a maximum out-of-band suppression of approximately 65 dB, and a rejection level of about 35 dB between the two passbands.

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K-band dual-band superconducting bandpass filter using uneven coupled SIRs and stub-loaded combining network

Chen,

Ren,

Yang

2024

Supercond. Sci. Technol.

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Superconducting isolators based on time-modulated coupled-resonator systems

Zhuang,

Gaikwad,

Kowsari

et al. 2024

Phys. Rev. Applied

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A Superconducting Dual-Band Bandpass Filter for IF Signals of Multi-Frequency Millimeter-Wave Atmospheric Spectrometer

Cited by 2 publications

References 6 publications

K-band dual-band superconducting bandpass filter using uneven coupled SIRs and stub-loaded combining network

K-band dual-band superconducting bandpass filter using uneven coupled SIRs and stub-loaded combining network

Superconducting isolators based on time-modulated coupled-resonator systems

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