scholarly journals An Aligned-Gap and Centered-Gap Rectangular Multiple Split Ring Resonator for Dielectric Sensing Applications

Sensors ◽  
2014 ◽  
Vol 14 (7) ◽  
pp. 13134-13148 ◽  
Author(s):  
Izyani Rusni ◽  
Alyani Ismail ◽  
Adam Alhawari ◽  
Mohd Hamidon ◽  
Nor Yusof
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Sensing Applications

scholarly journals Coupling Schemes in Terahertz Planar Metamaterials

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Dibakar Roy Chowdhury ◽  
Ranjan Singh ◽  
Antoinette J. Taylor ◽  
Hou-Tong Chen ◽  
Weili Zhang ◽  
...  
Keyword(s):  
Resonance Line ◽  
Ring Resonator ◽  
Near Field ◽  
Split Ring Resonator ◽  
Higher Order ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Sensing Applications ◽  
Lattice Mode

We present a review of the different coupling schemes in a planar array of terahertz metamaterials. The gap-to-gap near-field capacitive coupling between split-ring resonators in a unit cell leads to either blue shift or red shift of the fundamental inductive-capacitive (LC) resonance, depending on the position of the split gap. The inductive coupling is enhanced by decreasing the inter resonator distance resulting in strong blue shifts of theLCresonance. We observe theLCresonance tuning only when the split-ring resonators are in close proximity of each other; otherwise, they appear to be uncoupled. Conversely, the higher-order resonances are sensitive to the smallest change in the inter particle distance or split-ring resonator orientation and undergo tremendous resonance line reshaping giving rise to a sharp subradiant resonance mode which produces hot spots useful for sensing applications. Most of the coupling schemes in a metamaterial are based on a near-field effect, though there also exists a mechanism to couple the resonators through the excitation of lowest-order lattice mode which facilitates the long-range radiative or diffractive coupling in the split-ring resonator plane leading to resonance line narrowing of the fundamental as well as the higher order resonance modes.

scholarly journals A Compact Ultrawideband Antenna Based on Hexagonal Split-Ring Resonator for pH Sensor Application

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2959 ◽  
Author(s):  
Mohammad Islam ◽  
Farhad Ashraf ◽  
Touhidul Alam ◽  
Norbahiah Misran ◽  
Kamarulzaman Mat
Keyword(s):  
Ring Resonator ◽  
Coupling Effect ◽  
Ph Sensor ◽  
Split Ring Resonator ◽  
Strip Line ◽  
Ph Sensing ◽  
Uwb Antenna ◽  
Split Ring ◽  
Electrical Length ◽  
Sensing Applications

A compact ultrawideband (UWB) antenna based on a hexagonal split-ring resonator (HSRR) is presented in this paper for sensing the pH factor. The modified HSRR is a new concept regarding the conventional square split-ring resonator (SSRR). Two HSRRs are interconnected with a strip line and a split in one HSRR is introduced to increase the electrical length and coupling effect. The presented UWB antenna consists of three unit cells on top of the radiating patch element. This combination of UWB antenna and HSRR gives double-negative characteristics which increase the sensitivity of the UWB antenna for the pH sensor. The proposed ultrawideband antenna metamaterial sensor was designed and fabricated on FR-4 substrate. The electrical length of the proposed metamaterial antenna sensor is 0.238 × 0.194 × 0.016 λ, where λ is the lowest frequency of 3 GHz. The fractional bandwidth and bandwidth dimension ratio were achieved with the metamaterial-inspired antenna as 146.91% and 3183.05, respectively. The operating frequency of this antenna sensor covers the bandwidth of 17 GHz, starting from 3 to 20 GHz with a realized gain of 3.88 dB. The proposed HSRR-based ultrawideband antenna sensor is found to reach high gain and bandwidth while maintaining the smallest electrical size, a highly desired property for pH-sensing applications.

scholarly journals Low-Cost and Lightweight 3D-Printed Split-Ring Resonator for Chemical Sensing Applications

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3049 ◽  
Author(s):  
Ahmed Salim ◽  
Saptarshi Ghosh ◽  
Sungjoon Lim
Keyword(s):  
Chemical Sensing ◽  
Ring Resonator ◽  
Low Cost ◽  
Three Dimensional ◽  
External Cavity ◽  
Cavity Resonator ◽  
Split Ring Resonator ◽  
Microwave Cavity ◽  
Split Ring ◽  
Sensing Applications

In this paper, a microwave cavity resonator is presented for chemical sensing applications. The proposed resonator is comprised of a three dimensional (3D) split-ring resonator (SRR) residing in an external cavity and capacitively coupled by a pair of coaxial probes. 3D-printing technology with polylactic acid (PLA) filament is used to build the 3D SRR and cavity. Then, the surfaces of the SRR and the inside walls of cavity are silver-coated. The novelty of our proposed structure is its light weight and inexpensive design, owing to the utilization of low density and low-cost PLA. A Teflon tube is passed through the split-gap of the SRR so that it is parallel to the applied electric field. With an empty tube, the resonance frequency of the structure is measured at 2.56 GHz with an insertion loss of 13.6 dB and quality factor (Q) of 75. A frequency shift of 205 MHz with respect to the empty channel was measured when deionized water (DIW) was injected into the tube. Using volume occupied by the structure, the weight of the proposed microwave resonator is estimated as 22.8 g which is significantly lighter than any metallic structure of comparable size.

Split-Ring Resonator-based sensor for thin-film sensing applications

2016 ◽  
Author(s):  
Gabriel Galindo-Romera ◽  
Francisco Javier Herraiz-Martinez ◽  
Marta Gil ◽  
Jose Juan Martinez-Martinez ◽  
Daniel Segovia-Vargas
Keyword(s):  
Thin Film ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Sensing Applications

scholarly journals A Submersible Printed Sensor Based on a Monopole-Coupled Split Ring Resonator for Permittivity Characterization

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1936 ◽  
Author(s):  
Erick Reyes-Vera ◽  
G. Acevedo-Osorio ◽  
Mauricio Arias-Correa ◽  
David E. Senior
Keyword(s):  
Ring Resonator ◽  
Surrounding Medium ◽  
Split Ring Resonator ◽  
Q Factor ◽  
Split Ring ◽  
Dielectric Characterization ◽  
Non Invasive ◽  
Sensing Applications ◽  
Compact Size ◽  
The One

This work presents a non-invasive, reusable and submersible permittivity sensor that uses a microwave technique for the dielectric characterization of liquid materials. The proposed device consists of a compact split ring resonator excited by two integrated monopole antennas. The sensing principle is based on the notch introduced by the resonators in the transmission coefficient, which is affected due to the introduction of the sensor in a new liquid material. Then, a frequency shift of the notch and the Q-factor of the proposed sensor are related with the changes in the surrounding medium. By means of a particular experimental procedure, commercial liquids are employed to obtain the calibration curve. Thus, a mathematical equation is obtained to extract the dielectric permittivity of liquid materials with unknown dielectric properties. A good match between simulated and experimental results is obtained, as well as a high Q-factor, compact size, good sensitivity and high repeatability for use in sensing applications. Sensors like the one here presented could lead to promising solutions for characterizing materials, particularly in determining material properties and quality in the food industry, bio-sensing and other applications.

scholarly journals Multiband transparency effect induced by toroidal excitation in a strongly coupled planar terahertz metamaterial

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Angana Bhattacharya ◽  
Rakesh Sarkar ◽  
Naval K. Sharma ◽  
Bhairov K. Bhowmik ◽  
Amir Ahmad ◽  
...  
Keyword(s):  
Coupled Oscillators ◽  
Ring Resonator ◽  
Near Field ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Strongly Coupled ◽  
Future Studies ◽  
High Q ◽  
Field Coupling ◽  
Sensing Applications

AbstractThe multiband transparency effect in terahertz (THz) domain has intrigued the scientific community due to its significance in developing THz multiband devices. In this article, we have proposed a planar metamaterial geometry comprised of a toroidal split ring resonator (TSRR) flanked by two asymmetric C resonators. The proposed geometry results in multi-band transparency windows in the THz region via strong near field coupling of the toroidal excitation with the dipolar C-resonators of the meta molecule. The geometry displays dominant toroidal excitation as demonstrated by a multipolar analysis of scattered radiation. High Q factor resonances of the metamaterial configuration is reported which can find significance in sensing applications. We report the frequency modulation of transparency windows by changing the separation between TSRR and the C resonators. The numerically simulated findings have been interpreted and validated using an equivalent theoretical model based upon three coupled oscillators system. Such modeling of toroidal resonances may be utilized in future studies on toroidal excitation based EIT responses in metamaterials. Our study has the potential to impact the development of terahertz photonic components useful in building next generation devices.

Split ring resonator inspired microstrip filtenna for Ku-band application

2017 ◽  
Vol 50 (4-6) ◽  
pp. 391-403 ◽  
Author(s):  
Soumya RANJAN MISHRA ◽  
K. L. SHEEJA ◽  
Nagendra P. PATHAK
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Ku Band
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