scholarly journals Enhancing Absorption Bandwidth through Vertically Oriented Metamaterials

2019 ◽  
Vol 9 (11) ◽  
pp. 2223 ◽  
Author(s):  
Aaron J. Pung ◽  
Michael D. Goldflam ◽  
D. Bruce Burckel ◽  
Igal Brener ◽  
Michael B. Sinclair ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Ring Resonator ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Split Ring Resonator ◽  
Unit Cell ◽  
Cell Coupling ◽  
Split Ring ◽  
Projection Lithography ◽  
Three Dimensional Space

Metamaterials research has developed perfect absorbers from microwave to optical frequencies, mainly featuring planar metamaterials, also referred to as metasurfaces. In this study, we investigated vertically oriented metamaterials, which make use of the entire three-dimensional space, as a new avenue to widen the spectral absorption band in the infrared regime between 20 and 40 THz. Vertically oriented metamaterials, such as those simulated in this work, can be experimentally realized through membrane projection lithography, which allows a single unit cell to be decorated with multiple resonators by exploiting the vertical dimension. In particular, we analyzed the cases of a unit cell containing a single vertical split-ring resonator (VSRR), a single planar split-ring resonator (PSRR), and both a VSRR and PSRR to explore intra-cell coupling between resonators. We show that the additional degrees of freedom enabled by placing multiple resonators in a unit cell lead to novel ways of achieving omnidirectional super absorption. Our results provide an innovative approach for controlling and designing engineered nanostructures.

Spectroscopic Characteristics of Three Dimensional Split-Ring Resonator Arrays at Terahertz Frequencies

2015 ◽  
Vol 15 (3) ◽  
pp. 2289-2293 ◽  
Author(s):  
David Shawn Wilbert ◽  
Mohammad Parvinnezhad Hokmabadi ◽  
Patrick Kung ◽  
Seongsin Margaret Kim
Keyword(s):  
Ring Resonator ◽  
Three Dimensional ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Spectroscopic Characteristics ◽  
Terahertz Frequencies ◽  
Resonator Arrays

scholarly journals Penta band single negative meta-atom absorber designed on square enclosed star-shaped modified split ring resonator for S-, C-, X- and Ku- bands microwave applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Md. Rashedul Islam ◽  
Mohammad Tariqul Islam ◽  
Md. Moniruzzaman ◽  
Md. Samsuzzaman ◽  
Haslina Arshad
Keyword(s):  
Ring Resonator ◽  
Surface Current ◽  
Good Deal ◽  
Split Ring Resonator ◽  
Unit Cell ◽  
Q Factor ◽  
Split Ring ◽  
Ring Shape ◽  
Microwave Applications ◽  
Meta Atom

AbstractThis paper represents a penta band square enclosed star-shaped modified split ring resonator (SRR) based single negative meta-atom absorber (MAA) for multi-band microwave regime applications. FR-4 low-cost material has been used as a substrate to make the MAA unit cell with 0.101λ0 × 0.101λ0 of electrical size, where λ0 is the wavelength calculated at the lower resonance frequency of 3.80 GHz. There are two outer square split ring and one inner star ring shape resonator of 0.035 mm thickness of copper placed on the one side, and another side of the substrate has full copper to construct the desired unit cell. The MAA unit cell provides five absorption peaks of 97.87%, 93.65%, 92.66%, 99.95%, and 99.86% at the frequencies of 3.80, 5.65, 8.45, 10.82, and 15.92 GHz, respectively, which covers S-, C-, X-, and Ku- bands. The properties of MAA have been investigated and analyzed in the E-, H-fields and surface current. The EMR and highest Q factor of the designed MAA is 9.87 and 30.41, respectively, and it shows a single negative (SNG) property. Different types of parametric analysis have been done to show the better performance of absorption. Advanced Designed System (ADS) software has been used for equivalent circuit to verify the simulated S11 result obtained from the CST-2019 software. Experimental outcomes of the MAA unit cell have a good deal with the simulated result and measured result of the 24 × 20 array of unit cells also shown. Since the unit cell provides superior EMR, excellent Q-factor, and highest absorption so the recommended MAA can be effectively used as a penta band absorber in microwave applications, like notch filtering, sensing, reducing the unintended noise generated with the copper component of the satellite and radar antennas.

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