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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

Experimental design of the HTS CRLH filter (a) Geometry and dimensions of the HTS CRLH device: L1 = 5.8, L2 = 1.1, L3 = 10, L4 = 4.1, L5 = 3.3, W1 = 3.95, W2 = 0.1, W3 = 5.9 (unit: mm).The element is patterned with 50-Ω feed lines. (b) Experimental configuration for transmission measurements through a fabricated device. The black curves show the measured waveforms of the incident and transmitted signal pulses. The fabricated HTS circuit is connected with SMA connectors. (c) Diagram of the substrate and depletion region near split gap. (d) Photograph of the fabricated HTS CRLH device. It is composed of SMA connector, metal shield box and HTS circuit. Its overall size is 15 mm × 16.9 mm. Scale bar has a length of 3 mm. (Substrate information: dielectric constant is 9.78, height is 0.5 mm, loss tangent is 2 × 10−5 at Tc = 77 K).
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f1: Experimental design of the HTS CRLH filter (a) Geometry and dimensions of the HTS CRLH device: L1 = 5.8, L2 = 1.1, L3 = 10, L4 = 4.1, L5 = 3.3, W1 = 3.95, W2 = 0.1, W3 = 5.9 (unit: mm).The element is patterned with 50-Ω feed lines. (b) Experimental configuration for transmission measurements through a fabricated device. The black curves show the measured waveforms of the incident and transmitted signal pulses. The fabricated HTS circuit is connected with SMA connectors. (c) Diagram of the substrate and depletion region near split gap. (d) Photograph of the fabricated HTS CRLH device. It is composed of SMA connector, metal shield box and HTS circuit. Its overall size is 15 mm × 16.9 mm. Scale bar has a length of 3 mm. (Substrate information: dielectric constant is 9.78, height is 0.5 mm, loss tangent is 2 × 10−5 at Tc = 77 K).

Mentions: Geometry and dimensions of the HTS CRLH filter are shown in Fig. 1a. From this figure, the proposed CRLH filter consists of two symmetrically interdigital structures (indicated by L4 and L5) and two capacitive patches (indicated by L1, 2W1, L3 and W3) connected by a narrow microstrip line (indicated by L2 and W2). This CRLH filter is fed by a pair of 50-Ω transmission lines. The patterns indicated by yellow color are covered by superconducting thin-film materials.


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)

Experimental design of the HTS CRLH filter (a) Geometry and dimensions of the HTS CRLH device: L1 = 5.8, L2 = 1.1, L3 = 10, L4 = 4.1, L5 = 3.3, W1 = 3.95, W2 = 0.1, W3 = 5.9 (unit: mm).The element is patterned with 50-Ω feed lines. (b) Experimental configuration for transmission measurements through a fabricated device. The black curves show the measured waveforms of the incident and transmitted signal pulses. The fabricated HTS circuit is connected with SMA connectors. (c) Diagram of the substrate and depletion region near split gap. (d) Photograph of the fabricated HTS CRLH device. It is composed of SMA connector, metal shield box and HTS circuit. Its overall size is 15 mm × 16.9 mm. Scale bar has a length of 3 mm. (Substrate information: dielectric constant is 9.78, height is 0.5 mm, loss tangent is 2 × 10−5 at Tc = 77 K).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Experimental design of the HTS CRLH filter (a) Geometry and dimensions of the HTS CRLH device: L1 = 5.8, L2 = 1.1, L3 = 10, L4 = 4.1, L5 = 3.3, W1 = 3.95, W2 = 0.1, W3 = 5.9 (unit: mm).The element is patterned with 50-Ω feed lines. (b) Experimental configuration for transmission measurements through a fabricated device. The black curves show the measured waveforms of the incident and transmitted signal pulses. The fabricated HTS circuit is connected with SMA connectors. (c) Diagram of the substrate and depletion region near split gap. (d) Photograph of the fabricated HTS CRLH device. It is composed of SMA connector, metal shield box and HTS circuit. Its overall size is 15 mm × 16.9 mm. Scale bar has a length of 3 mm. (Substrate information: dielectric constant is 9.78, height is 0.5 mm, loss tangent is 2 × 10−5 at Tc = 77 K).
Mentions: Geometry and dimensions of the HTS CRLH filter are shown in Fig. 1a. From this figure, the proposed CRLH filter consists of two symmetrically interdigital structures (indicated by L4 and L5) and two capacitive patches (indicated by L1, 2W1, L3 and W3) connected by a narrow microstrip line (indicated by L2 and W2). This CRLH filter is fed by a pair of 50-Ω transmission lines. The patterns indicated by yellow color are covered by superconducting thin-film materials.

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