Optically Transparent Broadband Microwave Absorption Metamaterial By Standing-Up Closed-Ring Resonators

In this paper characterization of dielectric materials in liquid and powder phase using concentric closed and split ring resonators of length λ, λ/2, and λ/4 is reported. Experimental results have been validated by simulations and theoretically modeling. Sensitivity of the resonator with closed rings was maximum. Experimentally extracted values of dielectric constant of ferrite ranged from 14.05 to 15.1 with closed ring resonators and from 13.6 to 14.02 with split ring resonator, respectively. For spirulina platensis the dielectric constant was lying in the range 1.78–1.93 and 1.74–2.04 with closed ring and split ring resonators, respectively. The values extracted experimentally are in good agreement with simulation and theoretically found values. However, the values obtained from closed ring resonator were in agreement with the dielectric constant values of ferrite and spirulina platensis.

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Switchable square ring bandpass to bandstop filter for ultra-wideband applications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078715001373 ◽

2015 ◽

Vol 9 (1) ◽

pp. 51-60

Author(s):

Mushtaq Alqaisy ◽

Chandan K. Chakrabraty ◽

Jawad K. Ali ◽

Adam Reda Alhawari ◽

Tale Saeidi

Keyword(s):

Computer Simulation ◽

Radio Frequency ◽

Ultra Wideband ◽

Ring Resonators ◽

Microstrip Filter ◽

Filter Structure ◽

Closed Ring ◽

Effective Cost ◽

Bandstop Filter ◽

Good Agreement

In this manuscript, serial-shunt of square ring resonators with step-impedance open circuited stub resonators to produce a new on-off switchable bandpass to bandstop response in the same ultra-wideband microstrip filter structure is proposed. The closed ring of series-shunt square ring resonators with a combine stubs are introduced to excite the bandpass response while bandstop characteristic excited when gaps are embedded in the corners of the square ring resonators. The main advantage of this microstrip filter is its capability to switch from bandpass-to-bandstop operation using open-short gap, respectively. A microwave simulator is utilized to show the switchable case by replacing Skyworks radio frequency diodes (RF-PIN) instead of those gaps. The entire filter models have been simulated using the computer simulation technology (CST) Microwave Studio. The computed results for the proposed filters were compared with the measured results of the both prototype structures (bandpass- and bandstop-filter). The codes also showed good agreement between them. Other advantages include being small in size, and low in effective cost.

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An Asymmetric Meandered Line Based Dual-Band ENG-TL Antenna Loaded with Complementary Closed Ring Resonators for Gain Enhancement

IETE Journal of Research ◽

10.1080/03772063.2021.1914202 ◽

2021 ◽

pp. 1-11

Author(s):

Raghvenda Kumar Singh ◽

Ashish Gupta

Keyword(s):

Ring Resonators ◽

Dual Band ◽

Gain Enhancement ◽

Closed Ring

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A reconfigurable bandpass-bandstop filter based on varactor-loaded closed-ring resonators [Technical Committee]

IEEE Microwave Magazine ◽

10.1109/mmm.2008.930742 ◽

2009 ◽

Vol 10 (1) ◽

pp. 138-140 ◽

Cited By ~ 26

Author(s):

Yi-Ming Chen ◽

Sheng-Fuh Chang ◽

Cheng-Yu Chou ◽

Kun-Hsing Liu

Keyword(s):

Technical Committee ◽

Ring Resonators ◽

Closed Ring ◽

Bandstop Filter

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Extraordinary terahertz transmission through a double-layer metal array with closed ring resonators

Optics Communications ◽

10.1016/j.optcom.2016.03.024 ◽

2016 ◽

Vol 370 ◽

pp. 256-262 ◽

Cited By ~ 1

Author(s):

Yadong Guo ◽

Zongheng Yuan ◽

Yuyang Yuan ◽

Sheng Wang ◽

Wentao Zhang

Keyword(s):

Double Layer ◽

Ring Resonators ◽

Closed Ring ◽

Terahertz Transmission

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Miniaturised tri‐band rhombus‐shaped metamaterial‐inspired antenna with gain enhancement using complementary closed ring resonators

IET Microwaves Antennas & Propagation ◽

10.1049/iet-map.2019.0567 ◽

2019 ◽

Vol 14 (2) ◽

pp. 185-193 ◽

Cited By ~ 1

Author(s):

Ashish Gupta ◽

Bajrang Bansal ◽

Vimal Kumar Mishra ◽

Anand Agrawal

Keyword(s):

Ring Resonators ◽

Gain Enhancement ◽

Closed Ring

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Gap-Size-Dependent Effective Phase Transition in Metasurfaces of Closed-Ring Resonators

Crystals ◽

10.3390/cryst11060684 ◽

2021 ◽

Vol 11 (6) ◽

pp. 684

Author(s):

Seojoo Lee ◽

Ji-Hun Kang

Keyword(s):

Lattice Spacing ◽

Effective Permittivity ◽

Ring Resonators ◽

Size Dependent ◽

Closed Ring ◽

Resonant Behavior ◽

Tightly Coupled ◽

Metal To Insulator Transition ◽

Effective Phase ◽

2D Crystals

We theoretically investigate a metal-to-insulator transition in artificial two-dimensional (2D) crystals (i.e., metasurfaces) of tightly coupled closed-ring resonators. Strong interaction between unit resonators in the metasurfaces yields the effective permittivity highly dependent on the lattice spacing of unit resonators. Through our rigorous theory, we provide a closed form of effective permittivity of the metasurface and reveal that the permittivity possesses a Lorentzian-type resonant behavior, implying that the transition of the effective permittivity can arise when the lattice spacing passes a critical value.

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