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Capacitive-coupled Series Spoof Surface Plasmon Polaritons.

Yin JY, Ren J, Zhang HC, Zhang Q, Cui TJ - Sci Rep (2016)

Bottom Line: Two conventional H-shaped unit cells are proposed to construct a new unit cell, and every two new unit cells are separated by a gap with certain distance, which is designed to implement capacitive coupling.It is shown that the proposed structure exhibits a stopband in 9-9.5 GHz while the band-pass feature maintains in 5-9 GHz and 9.5-11 GHz.The compact size, easy fabrication and good band-pass and band-stop features make the proposed structure a promising plasmonic device in SPP communication systems.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.

ABSTRACT
A novel method to realize stopband within the operating frequency of spoof surface plasmon polaritons (SPPs) is presented. The stopband is introduced by a new kind of capacitive-coupled series spoof SPPs. Two conventional H-shaped unit cells are proposed to construct a new unit cell, and every two new unit cells are separated by a gap with certain distance, which is designed to implement capacitive coupling. The original surface impedance matching is disturbed by the capacitive coupling, leading to the stopband during the transmission of SPPs. The proposed method is verified by both numerical simulations and experiments, and the simulated and measured results have good agreements. It is shown that the proposed structure exhibits a stopband in 9-9.5 GHz while the band-pass feature maintains in 5-9 GHz and 9.5-11 GHz. In the passband, the reflection coefficient is less than -10 dB, and the transmission loss is around 3 dB; in the stopband, the reflection coefficient is -2 dB, and the transmission coefficient is less than -30 dB. The compact size, easy fabrication and good band-pass and band-stop features make the proposed structure a promising plasmonic device in SPP communication systems.

No MeSH data available.


Related in: MedlinePlus

Simulated reflection coefficients of different kinds of new unit cell.Type A is the initial design in this paper. Three traditional unit cells compose the unit cell of Type B, while four traditional unit cells compose the unit cell of Type C. The letters with subscript signify the stopband of relevant type.
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f7: Simulated reflection coefficients of different kinds of new unit cell.Type A is the initial design in this paper. Three traditional unit cells compose the unit cell of Type B, while four traditional unit cells compose the unit cell of Type C. The letters with subscript signify the stopband of relevant type.

Mentions: After the value of the gap is determined, another parameter should be studied for further understanding. In order to find the effect of the location of the gap, different kinds of new unit cells are used to make simulation. The initial unit cell of this paper is composed of two conventional unit cells. This kind of design is called Type A here for simplification. For comparison, if three conventional unit cells compose of a new unit cell, it is called Type B. And Type C is for the unit cell composed of four conventional unit cells. The simulated reflection coefficients of these three kinds of design are given in Fig. 7. A1 indicates the only stopband of Type A, while B1 and B2 are the two stopbands of Type B. Similarly, C1, C2 and C3 are the three stopbands of Type C. From the simulated results, it can be observed that the number of the stopbands is related to the number of the conventional unit cells. The appearance of each stopband can be predicted in a similar way through the analysis above.


Capacitive-coupled Series Spoof Surface Plasmon Polaritons.

Yin JY, Ren J, Zhang HC, Zhang Q, Cui TJ - Sci Rep (2016)

Simulated reflection coefficients of different kinds of new unit cell.Type A is the initial design in this paper. Three traditional unit cells compose the unit cell of Type B, while four traditional unit cells compose the unit cell of Type C. The letters with subscript signify the stopband of relevant type.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835726&req=5

f7: Simulated reflection coefficients of different kinds of new unit cell.Type A is the initial design in this paper. Three traditional unit cells compose the unit cell of Type B, while four traditional unit cells compose the unit cell of Type C. The letters with subscript signify the stopband of relevant type.
Mentions: After the value of the gap is determined, another parameter should be studied for further understanding. In order to find the effect of the location of the gap, different kinds of new unit cells are used to make simulation. The initial unit cell of this paper is composed of two conventional unit cells. This kind of design is called Type A here for simplification. For comparison, if three conventional unit cells compose of a new unit cell, it is called Type B. And Type C is for the unit cell composed of four conventional unit cells. The simulated reflection coefficients of these three kinds of design are given in Fig. 7. A1 indicates the only stopband of Type A, while B1 and B2 are the two stopbands of Type B. Similarly, C1, C2 and C3 are the three stopbands of Type C. From the simulated results, it can be observed that the number of the stopbands is related to the number of the conventional unit cells. The appearance of each stopband can be predicted in a similar way through the analysis above.

Bottom Line: Two conventional H-shaped unit cells are proposed to construct a new unit cell, and every two new unit cells are separated by a gap with certain distance, which is designed to implement capacitive coupling.It is shown that the proposed structure exhibits a stopband in 9-9.5 GHz while the band-pass feature maintains in 5-9 GHz and 9.5-11 GHz.The compact size, easy fabrication and good band-pass and band-stop features make the proposed structure a promising plasmonic device in SPP communication systems.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.

ABSTRACT
A novel method to realize stopband within the operating frequency of spoof surface plasmon polaritons (SPPs) is presented. The stopband is introduced by a new kind of capacitive-coupled series spoof SPPs. Two conventional H-shaped unit cells are proposed to construct a new unit cell, and every two new unit cells are separated by a gap with certain distance, which is designed to implement capacitive coupling. The original surface impedance matching is disturbed by the capacitive coupling, leading to the stopband during the transmission of SPPs. The proposed method is verified by both numerical simulations and experiments, and the simulated and measured results have good agreements. It is shown that the proposed structure exhibits a stopband in 9-9.5 GHz while the band-pass feature maintains in 5-9 GHz and 9.5-11 GHz. In the passband, the reflection coefficient is less than -10 dB, and the transmission loss is around 3 dB; in the stopband, the reflection coefficient is -2 dB, and the transmission coefficient is less than -30 dB. The compact size, easy fabrication and good band-pass and band-stop features make the proposed structure a promising plasmonic device in SPP communication systems.

No MeSH data available.


Related in: MedlinePlus