scholarly journals A pseudo anapole based electromagnetic cloaking scheme using Split Ring Resonators

2021 ◽  
Author(s):  
Sarin VP ◽  
Vinesh PV ◽  
Manoj M ◽  
Mohanan P ◽  
Vasudevan K
Keyword(s):  
Scattering Theory ◽  
Dipole Moments ◽  
Simulation Software ◽  
Ring Resonators ◽  
Experimental Demonstration ◽  
Split Ring ◽  
Electric Dipole Moments ◽  
Split Ring Resonators ◽  
Full Wave ◽  
Metallic Target

Abstract This paper proposes the first experimental demonstration of a pseudo-anapole-based cylindrical electromagnetic cloaking scheme. The pseudo-anapole state is excited by arranging split-ring resonators around a cylindrical metallic target. We used the multipole scattering theory to identify the actual reason behind the cloaking operation. Pseudo anapole condition is characterized by the scattering minima from toroidal and electric dipole moments, and hence the metallic target is undetectable from backscattering measurements. The results are verified using full-wave simulation software and subsequently validated with backscattering measurements inside an anechoic chamber.

scholarly journals An Electromagnetic Cloaking Scheme Using Magnetic Dipole Based Scattering Cancellation

2021 ◽  
Author(s):  
Sarin VP ◽  
Vinesh PV ◽  
Manoj M ◽  
Mohanan P ◽  
Vasudevan K
Keyword(s):  
Magnetic Dipole ◽  
Dipole Moments ◽  
Simulation Software ◽  
Ring Resonators ◽  
Split Ring ◽  
Magnetic Dipoles ◽  
Scattered Power ◽  
Dipole Excitation ◽  
Full Wave ◽  
Cylindrical Metal

Abstract This paper explores the possibility of creating a cylindrical electromagnetic cloaking scheme using resonant magnetic dipole excitation. Split-ring resonators are arranged around the cylindrical metal target to generate strong subwavelength resonant magnetic dipole moments to cancel far-field scattered power from the target. We used the multipole scattering theory to identify the actual reason behind scattering cancellation. The scattering from resonant circulating magnetic dipoles interferes destructively with that from the non-resonant electric dipole moments of the target resulting in a significant reduction in the Scattering Cross Section. The results are verified using full-wave simulation software and subsequently validated with backscattering measurements inside an anechoic chamber.

scholarly journals Microstrip antenna with DGS based on CSRR array for WiMAX applications

2019 ◽  
Vol 9 (1) ◽  
pp. 157
Author(s):  
Ajay V. G. ◽  
Parvathy A. R. ◽  
Thomaskutty Mathew
Keyword(s):  
Resonant Frequency ◽  
Microstrip Antenna ◽  
Patch Size ◽  
Return Loss ◽  
Ground Plane ◽  
Simulation Software ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Novel Method

<span lang="EN-US">This paper reports a novel method for designing a miniaturized microstrip antenna with DGS based on CSRR array which operates in the frequency of 2.6GHz for low band WiMAX application. The proposed antenna is designed using ANSYS HFSS simulation software. The antenna with optimized parameters is fabricated using FR-4 substrate of thickness 1.6 mm. The simulated and measured performances of the antenna in terms of return loss, directivity and radiation patterns are presented in this work. When Complimentary Split Ring Resonators (CSRRs) array are placed on the ground plane, the resonant frequency is shifted  to a lower value and patch size is reduced .The measurements were taken and compared with the simulated results. The performance characteristics obtained from the measurements show that the proposed antenna is suited for WiMAX application at 2.6GHz.</span>

scholarly journals Polarization-Independent and Angle-Insensitive Metamaterial Absorber Using 90-Degree-Rotated Split-Ring Resonators

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Jia-Qi Feng ◽  
Wei-Dong Hu ◽  
Qing-Le Zhang ◽  
Hua Zong ◽  
Hui Huang ◽  
...  
Keyword(s):  
Incident Angle ◽  
Metamaterial Absorber ◽  
Ring Resonators ◽  
Naval Research ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Full Wave ◽  
X Band ◽  
Polarization Insensitive ◽  
Polarization Independent

We present the design, simulation, and measurement of a polarization-independent and angle-insensitive metamaterial absorber (MA) in X-band. Since the unit cell of the MA consists of four subwavelength split-ring resonators with 4-fold symmetric rotation, the MA is insensitive to the variation of both polarization and incident angle of the planar electromagnetic wave. The electromagnetic performances of the MA are studied by full-wave simulations based on finite-element method and the Naval Research Laboratory arch experimental measurements. The electric field distributions are numerically investigated, which confirm the polarization-insensitive property of the MA, as expected from the symmetric nature of the structure. When the incident angles vary from 0 to 45 degrees, the MA remains at full width at half maximum of 0.4 GHz (0.5 GHz) with peak absorptions of 99.9% (95.2%) at 10.27 GHz (10.3 GHz) by simulations (measurements).

scholarly journals Design of a SIW Bandpass Filter Using Defected Ground Structure with CSRRs

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Weiping Li ◽  
Zongxi Tang ◽  
Xin Cao
Keyword(s):  
Bandpass Filter ◽  
Simulation Software ◽  
Ring Resonators ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Resonant Modes ◽  
Measurement Results ◽  
Good Agreement

In this paper, a substrate integrated waveguide (SIW) bandpass filter using defected ground structure (DGS) with complementary split ring resonators (CSRRs) is proposed. By using the unique resonant properties of CSRRs and DGSs, two passbands with a transmission zero in the middle have been achieved. The resonant modes of the two passbands are different and the bandwidth of the second passband is much wider than that of the first one. In order to increase out-of-band rejection, a pair of dumbbell DGSs has been added on each side of the CSRRs. The structure is analyzed using equivalent circuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured. The measurement results are in good agreement with the simulated ones.

Compact Triple-Band Waveguide Bandpass Filter Using Concentric Multiple Complementary Split Ring Resonators

2017 ◽  
Vol 26 (06) ◽  
pp. 1750096 ◽  
Author(s):  
Amit Bage ◽  
Sushrut Das
Keyword(s):  
High Frequency ◽  
Bandpass Filter ◽  
Simulation Software ◽  
Transverse Plane ◽  
Ring Resonators ◽  
Light Weight ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Good Agreement ◽  
Triple Band

This paper presents a compact tri-band waveguide bandpass filter using concentric multiple complementary split ring resonators (CSRRs). Two symmetrical concentric multiple CSRRs are placed on the transverse plane of a standard WR-90 rectangular waveguide at 8.41[Formula: see text]mm distance to achieve dual-pole, tri-band response. The proposed filter has been simulated using Ansoft High Frequency Simulation Software (version 14). Based on the simulated result the filter has been fabricated and tested. The measured result shows a dual-pole, tri-band, bandpass response with passbands at 8.04–8.2675[Formula: see text]GHz, 9.45–9.84925[Formula: see text]GHz and 11.35–12.005[Formula: see text]GHz, which is in good agreement with the simulated responses. The total length of the filter is 10[Formula: see text]mm, which makes it compact and light weight. An approximate equivalent circuit of the filter also has been provided.

Design and implementation of compact tri- and quad-band SIW power divider using modified circular complementary split-ring resonators

2022 ◽  
pp. 1-9
Author(s):  
Tharani Duraisamy ◽  
Selvajyothi Kamakshy ◽  
Karthikeyan Sholampettai Subramanian ◽  
Rusan Kumar Barik ◽  
Qingsha S. Cheng
Keyword(s):  
Ring Resonators ◽  
Power Divider ◽  
Operating Frequency ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Full Wave ◽  
Different Types ◽  
Working Principle ◽  
Minimum Amplitude ◽  
Equal Power

Abstract This paper presents a miniaturized tri- and quad-band power divider (PD)based on substrate integrated waveguide (SIW). By adopting different types of modified circular complementary split-ring resonators on the top surface of SIW, multiple passbands are generated propagating below the SIW cut-off frequency. The working principle is based on evanescent mode propagation that decreases the operating frequency of the PD and helps in the miniaturization of the proposed structure. The operating frequency of the proposed PD can be individually controlled by changing the dimensions of the resonator. To verify the proposed concept, a tri-band and a quad-band PD exhibiting 3 dB equal power division at 2.41/3.46/4.65 GHz and 2.42/3.78/4.74/5.8 GHz are designed using the full-wave simulator, validated through circuit model, fabricated and experimentally verified. The measured results agree well with the simulations. The proposed PDs have good performance in terms of reasonable insertion loss, isolation, minimum amplitude and phase imbalance, smaller footprint, easy fabrication and integration. The size of the fabricated prototype is 18.3 mm × 8.4 mm, which corresponds to 0.205λ g × 0.094λ g , λ g being the guided wavelength at the first operating frequency.

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