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2016 ; 6
(ä): 24605
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Capacitive-coupled Series Spoof Surface Plasmon Polaritons
#MMPMID27089949
Yin JY
; Ren J
; Zhang HC
; Zhang Q
; Cui TJ
Sci Rep
2016[Apr]; 6
(ä): 24605
PMID27089949
show ga
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.