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Ultra-wideband filtering of spoof surface plasmon polaritons using deep subwavelength planar structures

View Article: PubMed Central - PubMed

ABSTRACT

Novel ultra-wideband filtering of spoof surface plasmon polaritons (SPPs) is proposed in the microwave frequency using deep subwavelength planar structures printed on thin and flexible dielectric substrate. The proposed planar SPPs waveguide is composed of two mirror-oriented metallic corrugated strips, which are further decorated with parallel-arranged slots in the main corrugated strips. This compound structure provides deep subwavelength field confinement as well as flexible parameters when employed as a plasmonic waveguide, which is potential to construct miniaturization. Using momentum and impedance matching technology, we achieve a smooth conversion between the proposed SPPs waveguide and the conventional transmission line. To verify the validity of the design, we fabricate a spoof SPPs filter, and the measured results illustrate excellent performance, in which the reflection coefficient is less than −10 dB within the −3 dB passband from 1.21 GHz to 7.21 GHz with the smallest insertion loss of 1.23 dB at 2.21 GHz, having very good agreements with numerical simulations. The ultra-wideband filter with low insertion loss and high transmission efficiency possesses great potential in modern communication systems.

No MeSH data available.


Simulated scattering parameters of the presented spoof SPPs filter varied with the ground curve shape parameter n at microwave frequencies.(a) S11 parameter and (b) S21 parameter.
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f4: Simulated scattering parameters of the presented spoof SPPs filter varied with the ground curve shape parameter n at microwave frequencies.(a) S11 parameter and (b) S21 parameter.

Mentions: where n is the shape parameter that can control the flaring speed of the exponential curve. As can be seen in Fig. 4, with the variation of n (n ≥ 1), the reflection and transmission characteristics of the filter can be obviously improved, especially at the frequency close to the lower stop band of the S11 curve, which means that the exponential curve shape contributes greatly to the momentum conversion in the pass band of the filter. However, as the parameter n increases to 4, the reflection energy increases again, particularly at the frequency close to the upper stop band of the S11 curve. Therefore, n = 3 is the optimal shape curve parameter for the presented transition section.


Ultra-wideband filtering of spoof surface plasmon polaritons using deep subwavelength planar structures
Simulated scattering parameters of the presented spoof SPPs filter varied with the ground curve shape parameter n at microwave frequencies.(a) S11 parameter and (b) S21 parameter.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5121608&req=5

f4: Simulated scattering parameters of the presented spoof SPPs filter varied with the ground curve shape parameter n at microwave frequencies.(a) S11 parameter and (b) S21 parameter.
Mentions: where n is the shape parameter that can control the flaring speed of the exponential curve. As can be seen in Fig. 4, with the variation of n (n ≥ 1), the reflection and transmission characteristics of the filter can be obviously improved, especially at the frequency close to the lower stop band of the S11 curve, which means that the exponential curve shape contributes greatly to the momentum conversion in the pass band of the filter. However, as the parameter n increases to 4, the reflection energy increases again, particularly at the frequency close to the upper stop band of the S11 curve. Therefore, n = 3 is the optimal shape curve parameter for the presented transition section.

View Article: PubMed Central - PubMed

ABSTRACT

Novel ultra-wideband filtering of spoof surface plasmon polaritons (SPPs) is proposed in the microwave frequency using deep subwavelength planar structures printed on thin and flexible dielectric substrate. The proposed planar SPPs waveguide is composed of two mirror-oriented metallic corrugated strips, which are further decorated with parallel-arranged slots in the main corrugated strips. This compound structure provides deep subwavelength field confinement as well as flexible parameters when employed as a plasmonic waveguide, which is potential to construct miniaturization. Using momentum and impedance matching technology, we achieve a smooth conversion between the proposed SPPs waveguide and the conventional transmission line. To verify the validity of the design, we fabricate a spoof SPPs filter, and the measured results illustrate excellent performance, in which the reflection coefficient is less than −10 dB within the −3 dB passband from 1.21 GHz to 7.21 GHz with the smallest insertion loss of 1.23 dB at 2.21 GHz, having very good agreements with numerical simulations. The ultra-wideband filter with low insertion loss and high transmission efficiency possesses great potential in modern communication systems.

No MeSH data available.