High-temperature superconductor resonators and phase shifters

Guo Chun Liang, Nathan Newman, David F. Hebert, Theodore Van Duzer, Nathan Newman, Brady F. Cole

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

High-Tc resonators and hybrid digital phase shifters have been designed, fabricated, and tested. The YBa2Cu3O7-δ (YBCO) films used were off-axis sputtered onto 0.5-mm-thick [100] LaAlO3 substrates and have surface impedances at 10 GHz as low as 20 μΩ at 4.2 K and 300 μΩ at 77 K. The dielectric constant of the LaAlO3 substrates was measured using straight-line and ring resonator techniques. The superconductor straight-line resonator, which uses silver as its ground plane, has a moderately high Q factor and has an electromagnetic feedthrough level below -65 dB up to 10 GHz. The authors also report the first demonstration of a semiconductor/superconductor microwave digital phase shifter. YBCO film was used to form the circuit, with semiconductor p-i-n diodes serving as switches. A 4-b superconductor phase-shifter design is also presented along with simulation results that indicate maximum total insertion loss (which occurs with all bits forward-biased) at 77 K to be 1.1 dB at 10 GHz. This is about 1.5-2.0-dB less than that of a similar copper phase shifter at room temperature (radiation loss is not taken into consideration in either case). The insertion loss difference will, to some extent, depend on the details of the designed circuit, and it will increase significantly if thinner substrates are used, in which case the microstrip loss is more significant.

Original languageEnglish (US)
Pages (from-to)58-66
Number of pages9
JournalIEEE Transactions on Applied Superconductivity
Volume1
Issue number1
DOIs
StatePublished - Mar 1991
Externally publishedYes

Fingerprint

High temperature superconductors
Phase shifters
high temperature superconductors
Resonators
resonators
Superconducting materials
insertion loss
Q factors
Insertion losses
p-i-n diodes
semiconductor diodes
Substrates
Semiconductor materials
Networks (circuits)
switches
silver
Silver
impedance
permittivity
electromagnetism

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

High-temperature superconductor resonators and phase shifters. / Liang, Guo Chun; Newman, Nathan; Hebert, David F.; Van Duzer, Theodore; Newman, Nathan; Cole, Brady F.

In: IEEE Transactions on Applied Superconductivity, Vol. 1, No. 1, 03.1991, p. 58-66.

Research output: Contribution to journalArticle

Liang, Guo Chun ; Newman, Nathan ; Hebert, David F. ; Van Duzer, Theodore ; Newman, Nathan ; Cole, Brady F. / High-temperature superconductor resonators and phase shifters. In: IEEE Transactions on Applied Superconductivity. 1991 ; Vol. 1, No. 1. pp. 58-66.
@article{5d213ccc86f7420d974d709bedc90ba6,
title = "High-temperature superconductor resonators and phase shifters",
abstract = "High-Tc resonators and hybrid digital phase shifters have been designed, fabricated, and tested. The YBa2Cu3O7-δ (YBCO) films used were off-axis sputtered onto 0.5-mm-thick [100] LaAlO3 substrates and have surface impedances at 10 GHz as low as 20 μΩ at 4.2 K and 300 μΩ at 77 K. The dielectric constant of the LaAlO3 substrates was measured using straight-line and ring resonator techniques. The superconductor straight-line resonator, which uses silver as its ground plane, has a moderately high Q factor and has an electromagnetic feedthrough level below -65 dB up to 10 GHz. The authors also report the first demonstration of a semiconductor/superconductor microwave digital phase shifter. YBCO film was used to form the circuit, with semiconductor p-i-n diodes serving as switches. A 4-b superconductor phase-shifter design is also presented along with simulation results that indicate maximum total insertion loss (which occurs with all bits forward-biased) at 77 K to be 1.1 dB at 10 GHz. This is about 1.5-2.0-dB less than that of a similar copper phase shifter at room temperature (radiation loss is not taken into consideration in either case). The insertion loss difference will, to some extent, depend on the details of the designed circuit, and it will increase significantly if thinner substrates are used, in which case the microstrip loss is more significant.",
author = "Liang, {Guo Chun} and Nathan Newman and Hebert, {David F.} and {Van Duzer}, Theodore and Nathan Newman and Cole, {Brady F.}",
year = "1991",
month = "3",
doi = "10.1109/77.80750",
language = "English (US)",
volume = "1",
pages = "58--66",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "1",

}

TY - JOUR

T1 - High-temperature superconductor resonators and phase shifters

AU - Liang, Guo Chun

AU - Newman, Nathan

AU - Hebert, David F.

AU - Van Duzer, Theodore

AU - Newman, Nathan

AU - Cole, Brady F.

PY - 1991/3

Y1 - 1991/3

N2 - High-Tc resonators and hybrid digital phase shifters have been designed, fabricated, and tested. The YBa2Cu3O7-δ (YBCO) films used were off-axis sputtered onto 0.5-mm-thick [100] LaAlO3 substrates and have surface impedances at 10 GHz as low as 20 μΩ at 4.2 K and 300 μΩ at 77 K. The dielectric constant of the LaAlO3 substrates was measured using straight-line and ring resonator techniques. The superconductor straight-line resonator, which uses silver as its ground plane, has a moderately high Q factor and has an electromagnetic feedthrough level below -65 dB up to 10 GHz. The authors also report the first demonstration of a semiconductor/superconductor microwave digital phase shifter. YBCO film was used to form the circuit, with semiconductor p-i-n diodes serving as switches. A 4-b superconductor phase-shifter design is also presented along with simulation results that indicate maximum total insertion loss (which occurs with all bits forward-biased) at 77 K to be 1.1 dB at 10 GHz. This is about 1.5-2.0-dB less than that of a similar copper phase shifter at room temperature (radiation loss is not taken into consideration in either case). The insertion loss difference will, to some extent, depend on the details of the designed circuit, and it will increase significantly if thinner substrates are used, in which case the microstrip loss is more significant.

AB - High-Tc resonators and hybrid digital phase shifters have been designed, fabricated, and tested. The YBa2Cu3O7-δ (YBCO) films used were off-axis sputtered onto 0.5-mm-thick [100] LaAlO3 substrates and have surface impedances at 10 GHz as low as 20 μΩ at 4.2 K and 300 μΩ at 77 K. The dielectric constant of the LaAlO3 substrates was measured using straight-line and ring resonator techniques. The superconductor straight-line resonator, which uses silver as its ground plane, has a moderately high Q factor and has an electromagnetic feedthrough level below -65 dB up to 10 GHz. The authors also report the first demonstration of a semiconductor/superconductor microwave digital phase shifter. YBCO film was used to form the circuit, with semiconductor p-i-n diodes serving as switches. A 4-b superconductor phase-shifter design is also presented along with simulation results that indicate maximum total insertion loss (which occurs with all bits forward-biased) at 77 K to be 1.1 dB at 10 GHz. This is about 1.5-2.0-dB less than that of a similar copper phase shifter at room temperature (radiation loss is not taken into consideration in either case). The insertion loss difference will, to some extent, depend on the details of the designed circuit, and it will increase significantly if thinner substrates are used, in which case the microstrip loss is more significant.

UR - http://www.scopus.com/inward/record.url?scp=0026120945&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026120945&partnerID=8YFLogxK

U2 - 10.1109/77.80750

DO - 10.1109/77.80750

M3 - Article

AN - SCOPUS:0026120945

VL - 1

SP - 58

EP - 66

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 1

ER -