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Observation of tunable nonlinear effects in an analogue of superconducting composite right/left hand filter.

Liu H, Lei J, Jiang H, Guan X, Ji L, Ma Z - Sci Rep (2015)

Bottom Line: Artificial structures with negative permittivity or permeability have attracted significant attention in the science community because they provide a pathway for obtaining exotic electromagnetic properties not found in natural materials.However, any future effort in creating tunable structures would require knowledge of nonlinear properties.Its nonlinear effects on temperature and power are studied by theoretical analysis and experiments.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Engineering, East China Jiaotong University, Nanchang, 330013, China.

ABSTRACT
Artificial structures with negative permittivity or permeability have attracted significant attention in the science community because they provide a pathway for obtaining exotic electromagnetic properties not found in natural materials. At the moment, the great challenge of these artificial structures in microwave frequency exhibits a relatively large loss. It is well-known that superconducting thin films have extremely low surface resistance. Hence, it is a good candidate to resolve this constraint. Besides, the reported artificial structures with negative permittivity or permeability are mainly focusing on linear regime of wave propagation. However, any future effort in creating tunable structures would require knowledge of nonlinear properties. In this work, a tunable superconducting filter with composite right/left-hand transmission property is proposed and fabricated. Its nonlinear effects on temperature and power are studied by theoretical analysis and experiments.

No MeSH data available.


Related in: MedlinePlus

Circuit model of the proposed HTS CRLH filter.Values of the lumped-elements in the circuit model are correlated with the relevant dimensions of HTS circuit in Fig. 1a. p is the length of CRLH filter. Z is impedance and Y is admittance.
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f3: Circuit model of the proposed HTS CRLH filter.Values of the lumped-elements in the circuit model are correlated with the relevant dimensions of HTS circuit in Fig. 1a. p is the length of CRLH filter. Z is impedance and Y is admittance.

Mentions: In order to interpret behaviors of the proposed HTS CRLH device, a circuit model is built up and shown in Fig. 3. CL and LR represent the coupling capacitance and parasitic inductance of interdigital structure (indicated by L4 and L5), respectively. LL is the distributed inductances of narrow microstrip lines (indicated by L2 and W2). CR and CG are the distributed capacitances of wide microstrip lines (indicated by (L1, W1) and (L3, W3), respectively). Rs is the surface resistance of high-temperature superconductor thin film. Rs is set to zero when operating temperature is less than Tc. The values of RLC lumped-elements in this circuit model are correlated with the relevant dimensions of HTS circuit in Fig. 1a. Relative calculation formulas for extracting the circuit parameters are given in Methods.


Observation of tunable nonlinear effects in an analogue of superconducting composite right/left hand filter.

Liu H, Lei J, Jiang H, Guan X, Ji L, Ma Z - Sci Rep (2015)

Circuit model of the proposed HTS CRLH filter.Values of the lumped-elements in the circuit model are correlated with the relevant dimensions of HTS circuit in Fig. 1a. p is the length of CRLH filter. Z is impedance and Y is admittance.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4595847&req=5

f3: Circuit model of the proposed HTS CRLH filter.Values of the lumped-elements in the circuit model are correlated with the relevant dimensions of HTS circuit in Fig. 1a. p is the length of CRLH filter. Z is impedance and Y is admittance.
Mentions: In order to interpret behaviors of the proposed HTS CRLH device, a circuit model is built up and shown in Fig. 3. CL and LR represent the coupling capacitance and parasitic inductance of interdigital structure (indicated by L4 and L5), respectively. LL is the distributed inductances of narrow microstrip lines (indicated by L2 and W2). CR and CG are the distributed capacitances of wide microstrip lines (indicated by (L1, W1) and (L3, W3), respectively). Rs is the surface resistance of high-temperature superconductor thin film. Rs is set to zero when operating temperature is less than Tc. The values of RLC lumped-elements in this circuit model are correlated with the relevant dimensions of HTS circuit in Fig. 1a. Relative calculation formulas for extracting the circuit parameters are given in Methods.

Bottom Line: Artificial structures with negative permittivity or permeability have attracted significant attention in the science community because they provide a pathway for obtaining exotic electromagnetic properties not found in natural materials.However, any future effort in creating tunable structures would require knowledge of nonlinear properties.Its nonlinear effects on temperature and power are studied by theoretical analysis and experiments.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Engineering, East China Jiaotong University, Nanchang, 330013, China.

ABSTRACT
Artificial structures with negative permittivity or permeability have attracted significant attention in the science community because they provide a pathway for obtaining exotic electromagnetic properties not found in natural materials. At the moment, the great challenge of these artificial structures in microwave frequency exhibits a relatively large loss. It is well-known that superconducting thin films have extremely low surface resistance. Hence, it is a good candidate to resolve this constraint. Besides, the reported artificial structures with negative permittivity or permeability are mainly focusing on linear regime of wave propagation. However, any future effort in creating tunable structures would require knowledge of nonlinear properties. In this work, a tunable superconducting filter with composite right/left-hand transmission property is proposed and fabricated. Its nonlinear effects on temperature and power are studied by theoretical analysis and experiments.

No MeSH data available.


Related in: MedlinePlus