Limits...
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

Analogical permittivity (ε) and permeability (μ) of the proposed HTS CRLH filter.Circuit parameters are as follows: LR = 4.66 nH, LL = 1.55 nH, CR = 5.475 pF, CL = 1.9 pF, CG = 12 pF, Rs = 0.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4595847&req=5

f5: Analogical permittivity (ε) and permeability (μ) of the proposed HTS CRLH filter.Circuit parameters are as follows: LR = 4.66 nH, LL = 1.55 nH, CR = 5.475 pF, CL = 1.9 pF, CG = 12 pF, Rs = 0.

Mentions: It is well known that the properties of materials in nature can be described by defining the macroscopic parameters permittivity ε and permeability μ. This allows for media to be grouped into four categories: (1) right hand material (ε > 0, μ > 0); (2) epsilon-negative material (ε < 0, μ > 0); (3) left hand material (ε < 0, μ < 0), and (4) mu-negative medium (ε > 0, μ < 0). Figure 5 shows the analogical permittivity (ε = Y/(jω)) and analogical permeability (μ = 2Z/(jω)) with varied frequencies. From Fig. 5, it can be found that ε < 0 and μ < 0 in the frequency range of 1.42–1.69 GHz (left-hand property). In this range, the analogical Poynting vector S and the vector k are in the opposite direction2. ε > 0 and μ > 0 in the frequency range of 1.69–2.16 GHz (right-hand property). In this range, the analogical Poynting vector S and the vector k are in the same direction2.


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)

Analogical permittivity (ε) and permeability (μ) of the proposed HTS CRLH filter.Circuit parameters are as follows: LR = 4.66 nH, LL = 1.55 nH, CR = 5.475 pF, CL = 1.9 pF, CG = 12 pF, Rs = 0.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Analogical permittivity (ε) and permeability (μ) of the proposed HTS CRLH filter.Circuit parameters are as follows: LR = 4.66 nH, LL = 1.55 nH, CR = 5.475 pF, CL = 1.9 pF, CG = 12 pF, Rs = 0.
Mentions: It is well known that the properties of materials in nature can be described by defining the macroscopic parameters permittivity ε and permeability μ. This allows for media to be grouped into four categories: (1) right hand material (ε > 0, μ > 0); (2) epsilon-negative material (ε < 0, μ > 0); (3) left hand material (ε < 0, μ < 0), and (4) mu-negative medium (ε > 0, μ < 0). Figure 5 shows the analogical permittivity (ε = Y/(jω)) and analogical permeability (μ = 2Z/(jω)) with varied frequencies. From Fig. 5, it can be found that ε < 0 and μ < 0 in the frequency range of 1.42–1.69 GHz (left-hand property). In this range, the analogical Poynting vector S and the vector k are in the opposite direction2. ε > 0 and μ > 0 in the frequency range of 1.69–2.16 GHz (right-hand property). In this range, the analogical Poynting vector S and the vector k are in the same direction2.

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