Design, modelling and simulation of a monolithic high-<i>T</i> <sub>c</sub> superconducting terahertz mixer

Gao, Xiang; Zhang, Ting; Du, Jia; Guo, Y. Jay

doi:10.1088/1361-6668/aade5b

Cited by 16 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The basic properties of single-junction HTS mixers, such as those made recently by CSIRO [80,81,[95][96][97][98][99][100][101][102][103][104][105][106][107] can be modelled with JSIM or WRspice. [108] figure 28 shows a basic circuit for mixer simulation.…”

Section: Single-junction Mixersmentioning

confidence: 99%

Modelling high- Tc electronics

Pegrum

2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

This Review examines methods to model Josephson devices such as arrays of superconducting quantum interference devices (SQUIDs) and rows within two-dimensional superconducting quantum interference filters or SQIFs. The emphasis is on high temperature superconducting (HTS) devices, though the techniques apply for any operating temperature. The methods use freely-available and proven software to first extract all self and mutual inductances of the thin-film device, and then to incorporate these data, plus junction models and thermal noise sources into an equivalent circuit for Josephson simulation. The inductance extraction stage also estimates the effective areas of each loop in a structure and also the variation of inductance as temperature changes, due to the varying penetration depth. The final post-processing stage can yield current–voltage, voltage-field and field spectral density responses. The Review also touches briefly on the simulation of a simple model for a terahertz single-junction HTS mixer and also looks at the behaviour of typical hysteretic and non-hysteric HTS RF SQUIDs.

show abstract

Section: Single-junction Mixersmentioning

confidence: 99%

Modelling high- Tc electronics

Pegrum

2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Considering the impedance matching, many works have reported different types of antennas with low impedances for JJ mixers. Du and Gao et al integrated and studied the slot antenna for YBCO step-edge JJ mixers [9][10][11][12][13]. Experiments show that the largest harmonic number for YBCO step-edge JJ mixers up to now is 31 at 600 GHz detection.…”

Section: Introductionmentioning

confidence: 99%

Multi-source excited travelling-wave bowtie antenna based on a meander series of YBCO bicrystal Josephson junctions

Yu,

Wang,

Wang

et al. 2023

Front. Phys.

View full text Add to dashboard Cite

Series superconducting Josephson junctions (JJs), as terahertz (THz) mixers, have attracted increasing attentions due to their advantages in solving the saturation problem of superconducting mixers, achieving higher mixing harmonics and higher sensitivity in THz band. However, the normal-state resistances of the series JJs are so low that there exists an impedance mismatch between the coupled antenna and the JJs. In this paper, a meander embedding travelling-wave bowtie antenna is proposed for a series of bicrystal JJs. With this antenna, not only the problem of impedance mismatch can be solved, but also more series JJs can be inserted into the antenna. Five and even seven series JJs in the meander match the proposed antenna well. Furthermore, combined current distribution, far-field radiation patterns and parameter study are investigated in the numerical simulation to analyze this antenna.

show abstract

“…Thus, the maximum harmonic number cannot be improved in the mixing because of the impedance mismatch. Recently, many works have been reported to enhance the mixing performance of YBCO JJ mixers, including the harmonic number in the mixing [9][10][11]. It shows that the maximum harmonic number from YBCO step-edge JJ is around 30, a bit higher than that with a semiconducting THz mixer.…”

Section: Introductionmentioning

confidence: 99%

High-Tc Superconducting Josephson Junction Harmonic Mixers with Stub Tuners on Integrated Bowtie Antennas

Chun

Gao

et al. 2022

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Ordinary mixers can hardly meet the requirements in terahertz (THz) communications due to the low-power and expensive THz sources. Sensitive harmonic mixers have been widely studied to avoid this problem, owing to the fact that the higher the number of harmonics, the lower the local oscillator (LO) frequency, and the lower the cost. High-Tc superconducting (HTS) Josephson junction (JJ) mixers are performing candidates for THz receiver frontends because of the advantages of excellent sensitivity, wide bandwidth, high harmonic number and low LO power requirement. However, the normal-state resistance of HTS JJ is so low that traditional antennas are difficult to match it. In other words, it is quite a challenge to match the input impedance to a low input impedance for traditional antennas, especially for antennas fed by coplanar striplines (CPSs). In this work, based on the structure of bowtie, two types of stub tuners were integrated to decrease the impedance of the bowtie antenna so as to improve the coupling efficiency between the traditional bowtie antenna and the JJ. Furthermore, HTS YBa2Cu3O7-δ (YBCO) JJ harmonic mixers coupled with the proposed structures and fed by CPSs are fabricated and measured. The measurements show that the JJ mixer coupled with a pair of open-end stubs of the bowtie antenna achieves up to 88 harmonics, with a conversion efficiency of −69.6 dB. In contrast, the JJ mixer coupled with a pair of lumped-element stubs of the bowtie antenna only attains to 30 harmonics, with a conversion efficiency of −73.4 dB. Additional numerical simulations indicate that the coupling efficiency is enhanced when the complex impedance of the antenna is explicitly considered. Compared with other coupled traditional antennas, the JJ mixer with bowtie antenna has the largest harmonic number. This work paves the way for the future application of low-frequency and low-cost LO for THz communications.

show abstract

Design, modelling and simulation of a monolithic high-T _c superconducting terahertz mixer

Cited by 16 publications

References 17 publications

Modelling high- Tc electronics

Modelling high- Tc electronics

Multi-source excited travelling-wave bowtie antenna based on a meander series of YBCO bicrystal Josephson junctions

High-Tc Superconducting Josephson Junction Harmonic Mixers with Stub Tuners on Integrated Bowtie Antennas

Contact Info

Product

Resources

About

Design, modelling and simulation of a monolithic high-T c superconducting terahertz mixer

Cited by 16 publications

References 17 publications

Modelling high- Tc electronics

Modelling high- Tc electronics

Multi-source excited travelling-wave bowtie antenna based on a meander series of YBCO bicrystal Josephson junctions

High-Tc Superconducting Josephson Junction Harmonic Mixers with Stub Tuners on Integrated Bowtie Antennas

Contact Info

Product

Resources

About

Design, modelling and simulation of a monolithic high-T _c superconducting terahertz mixer