Broadband Tunable Phase Shifter For Microwaves

• URL: http://arxiv.org/abs/2003.01356v1
• Date: Tue, 3 Mar 2020 06:42:09 GMT
• Title: Broadband Tunable Phase Shifter For Microwaves
• Authors: Jinli Zhang, Tianyi Li, Roope Kokkoniemi, Chengyu Yan, Wei Liu, Matti Partanen, Kuan Yen Tan, Ming He, Lu Ji, Leif Gr\"onberg, and Mikko M\"ott\"onen
• Abstract summary: We implement a broadly tunable phase shifter for microwaves based on superconducting quantum interference devices (SQUIDs) At different frequencies, a unit transmission coefficient, $|S_21|=1$, can be theoretically achieved along a curve where the phase shift is controllable by magnetic flux.
• Score: 9.428205632703465
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We implement a broadly tunable phase shifter for microwaves based on superconducting quantum interference devices (SQUIDs) and study it both experimentally and theoretically. At different frequencies, a unit transmission coefficient, $|S_{21}|=1$, can be theoretically achieved along a curve where the phase shift is controllable by magnetic flux. The fabricated device consists of three equidistant SQUIDs interrupting a transmission line. We model each SQUID embedded at different positions along the transmission line with two parameters, capacitance and inductance, the values of which we extract from the experiments. In our experiments, the tunability of the phase shift varies from from $0.07\times\pi$ to $0.14\times\pi$ radians along the full-transmission curve with the input frequency ranging from 6.00 to 6.28~GHz. The reported measurements are in good agreement with simulations, which is promising for future design work of phase shifters for different applications.

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