A Frequency Independent Framework for Synthesis of Programmable Non-reciprocal Networks

Lu, Ruochen; Krol, Jack; Gao, Liuqing; Gong, Songbin

doi:10.1038/s41598-018-32898-x

Cited by 20 publications

(9 citation statements)

References 25 publications

(30 reference statements)

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“…Imposing that, from (18), all the Γ ′ are negative imaginary, the directionality of the unit cell is obtained as…”

Section: Calculation Of Directionalitymentioning

confidence: 99%

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Low-Loss and Wideband Acoustic Delay Lines

Manzaneque

Yang

et al. 2019

IEEE Trans. Microwave Theory Techn.

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This paper demonstrates low-loss acoustic delay lines based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss acoustic delay lines based on unidirectional transducers. The high acoustic reflections and large transducer uni-directionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great trade-off between delay line insertion loss and bandwidth. The directionality for two different types of uni-directional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3 dB bandwidth of 16 MHz centered at 160 MHz (FBW=10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.

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“…Imposing that, from (18), all the Γ ′ are negative imaginary, the directionality of the unit cell is obtained as…”

Section: Calculation Of Directionalitymentioning

confidence: 99%

“…By evaluating (18) into (22), it can be proven that the directionality of each unit cell in a multi-cell configuration has the same value…”

Section: Calculation Of Directionalitymentioning

confidence: 99%

Low-Loss and Wideband Acoustic Delay Lines

Manzaneque

Yang

et al. 2019

IEEE Trans. Microwave Theory Techn.

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“…A prototype was made to verify the broadband isolation reconfigurable properties of the STI, as shown in Figure 9, which is also inspired by the previous work [14]. In this design, the GQSS in the DBG were made of a 1.6-mm FR-4 printed circuit broad (PCB) and four Minicircuits' single-pole double-throw (SPDT) switches.…”

Section: The Experiments Of the Stimentioning

confidence: 99%

Magnetic-Free Isolators Based on Time-Varying Transmission Lines

Zheng

Fang

et al. 2019

Electronics

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Two magnetic-free reconfigurable isolators based on a doubly balanced gyrator (DBG) are designed in this paper. One of the isolators is a single-ended transmission isolator (STI), which uses two matching resistors to absorb the signal transmitted in the reverse direction. In theory, it has infinite isolation bandwidth, which is verified by simulation and an experiment. The other isolator is a differential transmission isolator (DTI) to improve the anti-interference performance, which consists of four Wilkinson power splitters (combiners) and two reciprocal transmission line segments. The DTI uses two pairs of differential signals to prevent the reverse signal. Compared to the STI, the DTI has higher power capacity. Furthermore, when the phases of the control signals acting on the switches are changed, the isolation directions of the two isolators will be changed, to obtain the reconfigurable property.

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“…To address this optimization problem, we propose the superconducting implementation of a recent concept for broadband circulation based on active modulation and delay [10][11][12][13][14]. The approach requires that the delay be commensurate with the modulation frequency, but imposes no constraints on the frequency of the input signal.…”

Section: Introductionmentioning

confidence: 99%

Design of an On-Chip Superconducting Microwave Circulator with Octave Bandwidth

2019

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We present a design for a superconducting, on-chip circulator composed of dynamically modulated transfer switches and delays. Design goals are set for the multiplexed readout of superconducting qubits. Simulations of the device show that it allows for low-loss circulation (insertion loss < 0.35 dB and isolation > 20 dB) over an instantaneous bandwidth of 2.3 GHz. As the device is estimated to be linear for input powers up to −65 dBm, this design improves on the bandwidth and powerhandling of previous superconducting circulators [1][2][3] by over a factor of 50, making it ideal for integration with broadband quantum limited amplifiers [4][5][6].

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A Frequency Independent Framework for Synthesis of Programmable Non-reciprocal Networks

Cited by 20 publications

References 25 publications

Low-Loss and Wideband Acoustic Delay Lines

Low-Loss and Wideband Acoustic Delay Lines

Magnetic-Free Isolators Based on Time-Varying Transmission Lines

Design of an On-Chip Superconducting Microwave Circulator with Octave Bandwidth

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