Multichannel Transmitting System Based on High-Temperature Superconducting Phase Shifter

Dahan, Y.; Holdengreber, Eldad; Mizrahi, Moshe; Schacham, S. E.; Farber, E.

doi:10.1109/tasc.2020.3028278

Cited by 6 publications

(5 citation statements)

References 19 publications

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“…As a result, the minimal critical current density was 3.23 M A/cm 2 . This result should be compared to a minimal critical current density of −1 M A/cm 2 and a larger non-uniformity of the critical current density with a roughness of 2 nm [ 37 ]. The strips had to be passivated against oxidation.…”

Section: Measurements and Resultsmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

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A new measurement technique of electrical parameters of superconducting thin films at the Very High Frequency (VHF) range is described, based on resonators with microstrip (MS) structures. The design of an optimal resonator was achieved, based on a thorough theoretical analysis, which is required for derivation of the exact configuration of the MS. A theoretical model is presented, from which an expression for the attenuation of a MS line can be derived. Accordingly, simulations were performed, and an optimal resonator for the VHF range was designed and implemented. Production constraints of YBa2Cu3O7 (YBCO) limited the diameter of the sapphire substrate to 3″. Therefore, a meander configuration was formed to fit the long λ/4 MS line on the wafer. By measuring the complex input reflection coefficients of a λ/4 resonator, we extracted the quality factor, which is mainly affected by the dielectric and conductor attenuations. The experimental results are well fitted by the theoretical model. The dielectric attenuation was calculated using the quasi-static analysis of the MS line. An identical copper resonator was produced and measured to compare the properties of the YBCO resonator in reference to the copper one. A quality factor of ~6·105 was calculated for the YBCO resonator, three orders of magnitude larger than that of the copper resonator. The attenuation per unit length of the YBCO layer was smaller by more than five orders of magnitude than that of the copper.

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Section: Measurements and Resultsmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

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“…As a result, the minimal critical current density was 3.23 MA/cm 2 . This result should be compared to a minimal critical current density of ~1 MA/cm 2 and a larger non-uniformity of the critical current density for a roughness of 2 nm [28]. The physical parameters of the filter are summarized in Table 1.…”

Section: Filter Design Simulations Implementation and Packaging Optim...mentioning

confidence: 99%

Very Low-Noise Figure HTSC RF Front-End

et al. 2022

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A very low noise figure radio frequency (RF) front-end for the cellular realm is presented. The front-end is composed of two planar YBCO high critical temperature superconductor (HTSC) bandpass filters (BPFs) and a low temperature, low noise amplifier. Using advanced HTSC growth techniques, 8-pole hairpin BPFs are implemented in a YBCO thin film grown on both sides of a sapphire substrate. The front-end is designed and implemented based on the optimal configuration of the filters derived from advanced electromagnetic simulations. Measured performance at 77 K shows a high-frequency response and very low losses, with an insertion loss of 0.15 dB and a rejection ratio of −93 dBc. The integration of HTSC filters with the low noise amplifier results in a system with superior performance, with a low noise figure of around 0.5 dB. Low insertion loss and the compact dimensions of the filter, along with low total system noise, make the designed superconducting RF front-end highly attractive for radio receivers.

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“…The cryogenic measurement system is illustrated in Figure A4. The system is composed of three main elements: a VNA, a computing system, and a polystyrene liquid nitrogen container [46][47][48]. The S-parameters were measured using the VNA, while the Device Under Test (DUT) was immersed in liquid nitrogen.…”

Section: Appendix Bmentioning

confidence: 99%

High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

et al. 2021

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A high-performance S-band down-conversion microstrip mixer, for operation from 77 K to 300 K, is described. The balanced mixer combines a 90 degree hybrid coupler, two Schottky diodes, a band pass filter, and a low pass filter. The coupler phase shift drastically improves noise rejection. The circuit was implemented according to the configuration obtained from extensive simulation results based on electromagnetic analysis. The experimental results agreed well with the simulation results, showing a maximum measured insertion loss of 0.4 dB at 2 GHz. The microstrip mixer can be easily adjusted to different frequency ranges, up to about 50 GHz, through the proper choice of microstrip configuration. This novel S-band cryogenic mixer, implemented without resorting to special components, shows a very high performance at liquid nitrogen temperatures, making this mixer very suitable for high-temperature superconductive applications, such as front-ends.

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Multichannel Transmitting System Based on High-Temperature Superconducting Phase Shifter

Cited by 6 publications

References 19 publications

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Very Low-Noise Figure HTSC RF Front-End

High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

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