Matches in SemOpenAlex for { <https://semopenalex.org/work/W1183222801> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W1183222801 abstract "Superconductor-Insulator-Superconductor (SIS) tunnel junctions are widely used as the mixing component in mm and sub-mm receivers for radio astronomy and environmental science. SIS mixers offer superior noise performance close to the quantum limit for frequencies up to 1 THz. An important property of an SIS junction is the intrinsic specific capacitance (Cs), which is defined by the geometrical capacitance (Cj) divided by the junction area (A). In order to prevent loss of the RF signal, a tuning circuitry is required to resonate out the Cj. The RF bandwidth of an SIS mixer is determined by the quality factor of the resulted resonator-like tuning circuitry, Q = ωRnCj, where Rn is the normal resistance of the junction and ω is the angular frequency. In order to increase the RF bandwidth of the mixer, junctions with lower specific resistance (RnA) and hence thinner insulator layer are required. For the practical SIS mixers, junctions with RnA < 100 Ω.µm2 (often as low as 20 Ω.µm2) are typically used. In this RnA range, the published data on the Cs vs. RnA are often spread and not consistent between different sources. Therefore, at this limit, the design of an accurate tuning circuitry becomes challenging. Hence, there is a well-recognized demand for accurate measurement of Cs.So far, all the developed characterisation methods measured the specific capacitance effect indirectly, e.g., in a resonant circuit. In this context, the specific capacitance was extracted by fitting the measurement data into a theoretical model. In this thesis, a new method was developed, which directly measures the junction capacitance at microwave frequencies (1 - 7 GHz) with estimated uncertainty varying from ±2% to ±11% depending on the junction area. In this measurement method, an original calibration approach was suggested and implemented.Using this method, the capacitance of 34 junctions with various RnA values ranging from 8 to 68 Ω.µm2 was measured. The observed scatter in the specific capacitance is discussed. We argue that, it is the tunnel barrier (thickness) nonuniformity, which is responsible for the observed spread of the Cs data. The nonlinear capacitance as a result of the Kramers-Kronig transformation of the dc IV characteristic of the SIS junction was shown to be a significant contribution for RnA < 40 Ω.µm2 even at frequencies as low as 1-7 GHz. The extracted specific capacitance from the measurements was corrected for the nonlinear capacitance. The obtained Cs(RnA) data agrees well with the model relation Cs = a/ln(RnA), where a =0.227 for the RnA < 40 Ω.µm2." @default.
- W1183222801 created "2016-06-24" @default.
- W1183222801 creator A5037015879 @default.
- W1183222801 date "2015-01-01" @default.
- W1183222801 modified "2023-09-27" @default.
- W1183222801 title "Characterisation of the Specific Capacitance of Superconducting Tunnel Junctions" @default.
- W1183222801 hasPublicationYear "2015" @default.
- W1183222801 type Work @default.
- W1183222801 sameAs 1183222801 @default.
- W1183222801 citedByCount "0" @default.
- W1183222801 crossrefType "dissertation" @default.
- W1183222801 hasAuthorship W1183222801A5037015879 @default.
- W1183222801 hasConcept C119599485 @default.
- W1183222801 hasConcept C12038964 @default.
- W1183222801 hasConcept C120398109 @default.
- W1183222801 hasConcept C121332964 @default.
- W1183222801 hasConcept C127413603 @default.
- W1183222801 hasConcept C134146338 @default.
- W1183222801 hasConcept C151730666 @default.
- W1183222801 hasConcept C17525397 @default.
- W1183222801 hasConcept C192562407 @default.
- W1183222801 hasConcept C212702 @default.
- W1183222801 hasConcept C26873012 @default.
- W1183222801 hasConcept C2776257435 @default.
- W1183222801 hasConcept C2779343474 @default.
- W1183222801 hasConcept C30066665 @default.
- W1183222801 hasConcept C49040817 @default.
- W1183222801 hasConcept C52660251 @default.
- W1183222801 hasConcept C54101563 @default.
- W1183222801 hasConcept C62520636 @default.
- W1183222801 hasConcept C67337642 @default.
- W1183222801 hasConcept C74064498 @default.
- W1183222801 hasConcept C76155785 @default.
- W1183222801 hasConcept C86803240 @default.
- W1183222801 hasConcept C89631360 @default.
- W1183222801 hasConcept C97126364 @default.
- W1183222801 hasConceptScore W1183222801C119599485 @default.
- W1183222801 hasConceptScore W1183222801C12038964 @default.
- W1183222801 hasConceptScore W1183222801C120398109 @default.
- W1183222801 hasConceptScore W1183222801C121332964 @default.
- W1183222801 hasConceptScore W1183222801C127413603 @default.
- W1183222801 hasConceptScore W1183222801C134146338 @default.
- W1183222801 hasConceptScore W1183222801C151730666 @default.
- W1183222801 hasConceptScore W1183222801C17525397 @default.
- W1183222801 hasConceptScore W1183222801C192562407 @default.
- W1183222801 hasConceptScore W1183222801C212702 @default.
- W1183222801 hasConceptScore W1183222801C26873012 @default.
- W1183222801 hasConceptScore W1183222801C2776257435 @default.
- W1183222801 hasConceptScore W1183222801C2779343474 @default.
- W1183222801 hasConceptScore W1183222801C30066665 @default.
- W1183222801 hasConceptScore W1183222801C49040817 @default.
- W1183222801 hasConceptScore W1183222801C52660251 @default.
- W1183222801 hasConceptScore W1183222801C54101563 @default.
- W1183222801 hasConceptScore W1183222801C62520636 @default.
- W1183222801 hasConceptScore W1183222801C67337642 @default.
- W1183222801 hasConceptScore W1183222801C74064498 @default.
- W1183222801 hasConceptScore W1183222801C76155785 @default.
- W1183222801 hasConceptScore W1183222801C86803240 @default.
- W1183222801 hasConceptScore W1183222801C89631360 @default.
- W1183222801 hasConceptScore W1183222801C97126364 @default.
- W1183222801 hasLocation W11832228011 @default.
- W1183222801 hasOpenAccess W1183222801 @default.
- W1183222801 hasPrimaryLocation W11832228011 @default.
- W1183222801 hasRelatedWork W1504951959 @default.
- W1183222801 hasRelatedWork W1983142126 @default.
- W1183222801 hasRelatedWork W1986247593 @default.
- W1183222801 hasRelatedWork W1994857922 @default.
- W1183222801 hasRelatedWork W2018299860 @default.
- W1183222801 hasRelatedWork W2023894336 @default.
- W1183222801 hasRelatedWork W2053111805 @default.
- W1183222801 hasRelatedWork W2068544484 @default.
- W1183222801 hasRelatedWork W2110376729 @default.
- W1183222801 hasRelatedWork W2117966060 @default.
- W1183222801 hasRelatedWork W2146836487 @default.
- W1183222801 hasRelatedWork W2152157511 @default.
- W1183222801 hasRelatedWork W2175513970 @default.
- W1183222801 hasRelatedWork W2552991106 @default.
- W1183222801 hasRelatedWork W3048176478 @default.
- W1183222801 hasRelatedWork W3203743969 @default.
- W1183222801 hasRelatedWork W51318510 @default.
- W1183222801 hasRelatedWork W73297749 @default.
- W1183222801 hasRelatedWork W2864617230 @default.
- W1183222801 hasRelatedWork W349777060 @default.
- W1183222801 isParatext "false" @default.
- W1183222801 isRetracted "false" @default.
- W1183222801 magId "1183222801" @default.
- W1183222801 workType "dissertation" @default.