Open AccessSharp-selectivity in-line topology low temperature superconducting bandpass filter for superconducting quantum applications
Author(s) -
Yuxing He,
Shiori Michibayashi,
Naoki Takeuchi,
Nobuyuki Yoshikawa
Publication year - 2020
Publication title -
superconductor science and technology/superconductor science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.033
H-Index - 105
eISSN - 1361-6668
pISSN - 0953-2048
DOI - 10.1088/1361-6668/ab6ec1
Subject(s) - topology (electrical circuits) , resonator , distributed element filter , band pass filter , physics , inductor , filter (signal processing) , lc circuit , transmission line , capacitor , electronic engineering , bandwidth (computing) , prototype filter , optoelectronics , computer science , low pass filter , electrical engineering , voltage , telecommunications , optics , quantum mechanics , engineering , computer vision
This paper presents a new class of sharp-selectivity low-temperature superconducting filter that incorporates lumped element resonant couplings. Dependent on a novel synthesis approach, the proposed filter exhibits great advantages such as: (1) a very simple in-line topology (without any cross coupling), (2) extremely compact size based on lumped inductor-capacitor ( LC ) elements, and (3) multiple transmission zeros (TZs) independently generated and controlled (via each resonant coupling). To facilitate the physical implementation, a group of lumped element circuit models are detailed, where series LC units are adopted for both the resonators and the resonant couplings. Considering an in-line topology here, the entire filter layout is then designed by cascading the lumped models one after another. For verification, a 5th-order bandpass filter centered at 5 GHz, with 500 MHz bandwidth and 3 TZs, is designed, simulated, and tested at cryogenic temperature (4.2 K). Moreover, preliminary simulations of the presented filter in series with an on-chip rapid single-flux-quantum microwave pulse generator are discussed for superconducting quantum applications.