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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

(a) Measured reflection coefficients compared with the simulated results. (b) Measured transmission coefficients compared with the simulated results.
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f8: (a) Measured reflection coefficients compared with the simulated results. (b) Measured transmission coefficients compared with the simulated results.

Mentions: In experimental demonstrations, the proposed structure was fabricated, as shown in Fig. 1(b). All materials in the experiment are the same as those in the simulation. The spectrum responses in Fig. 8(a,b) present a desirable consistency between simulated and measured results, except for a slight deviation in the second passband, which is resulted from the fabrication error and matching error. Meanwhile a larger transmission loss is observed in the experiment, which is mainly due to the ignorance of dielectric loss and metal loss in the simulations. From the measured results, it can be seen that the reflection coefficient is less than −10 dB and the transmission loss is around 3 dB in the passband; while the reflection coefficient is −2 dB and the transmission coefficient is less than −30 dB in the stopband. The good performance suggests that the capacitive coupling to bring about stopband completes the mission successfully.


Capacitive-coupled Series Spoof Surface Plasmon Polaritons.

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

(a) Measured reflection coefficients compared with the simulated results. (b) Measured transmission coefficients compared with the simulated results.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f8: (a) Measured reflection coefficients compared with the simulated results. (b) Measured transmission coefficients compared with the simulated results.
Mentions: In experimental demonstrations, the proposed structure was fabricated, as shown in Fig. 1(b). All materials in the experiment are the same as those in the simulation. The spectrum responses in Fig. 8(a,b) present a desirable consistency between simulated and measured results, except for a slight deviation in the second passband, which is resulted from the fabrication error and matching error. Meanwhile a larger transmission loss is observed in the experiment, which is mainly due to the ignorance of dielectric loss and metal loss in the simulations. From the measured results, it can be seen that the reflection coefficient is less than −10 dB and the transmission loss is around 3 dB in the passband; while the reflection coefficient is −2 dB and the transmission coefficient is less than −30 dB in the stopband. The good performance suggests that the capacitive coupling to bring about stopband completes the mission successfully.

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