Versatile CAD formulation for estimation of the resonant frequency and magnetic polarizability of circular split ring resonators

Saha, Chinmoy; Siddiqui, Jawad Y.

doi:10.1002/mmce.20533

Cited by 46 publications

(46 citation statements)

References 13 publications

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“…Estimation through the equivalent circuit model e.g. 33–36 , could be used, as well. However, the full-electromagnetic study was adopted because, in general, is more accurate since takes into account the real shape of the geometry, the total coupling between the antenna parts and the antenna radiation.…”

Section: Resultsmentioning

confidence: 99%

Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting

Assimonis

Fusco

Georgiadis

et al. 2018

Sci Rep

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A new electrically small antenna with size ka = 0.415 is presented, fabricated and measured in this work. This is intrinsically matched to 50 Ω, has omni-directional and linear-polarized radiation pattern in the horizontal plane with maximum directivity of 1.75 dBi and simulated radiation efficiency of 93%. The antenna in combination with a low-complex and co-planar rectifier with one single diode forms a high efficient and sensitive electrically small rectenna with ka = 0.53 at 868 MHz (UHF RFID-band in Europe). The latter has measured efficiency 22.5% for −19 dBm power input and sensitivity of −44 dBm (or equivalently 0.00028 μW/cm2 power density), while at 2.25 μW/cm2 is able to supply continuously, i.e., without a boost converter or use of any energy tank, a small electrical device with 118 μW. In order to increase the dc output voltage and the delivered dc power to the load for lower power density levels, rectenna-array configuration is exploited. Application to batteryless, backscatter wireless sensor node powering is discussed. Specifically, for a power density of 0.1237 μW/cm2 the RF energy harvesting system delivers 172 μW at 2.85 V every 22.5 s.

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Section: Resultsmentioning

confidence: 99%

Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting

Assimonis

Fusco

Georgiadis

et al. 2018

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The equivalent circuit of the proposed SRR is also indicated in Figure , where L TI indicates the total inductance, C GC and C DC are gap capacitance and distributed capacitance, respectively. The distributed capacitance C DC is obtained across the two rectangular halves with respect to the split gaps for the proposed SRR structure . Since there is an external magnetic field along z‐axis of the proposed SRR, it induced an electromotive force, which is present around the SRR.…”

Section: Studies Of the Proposed Designmentioning

confidence: 88%

“…As per the setup port 1 and 2 are present to excite the proposed rectangular SRR. The refractive index ( n r ) and impedance ( z s ) can be determined from these retrieved S‐parameters with the help of the following Equations . Equation provide the effective medium parameter (magnetic permeability μ).

n_{r} = ((), 1 / k_{0} t_{s}) \cos^{- 1} ([], ((), 1 / 2 S_{21}) ({}, false(1 - {(S_{11})}^{2} + {(S_{21})}^{2}))

z_{s} = {[\{{((), 1 + S_{11})}^{2} - {((), {normalS}_{21})}^{2}\} / {{((), 1 - S_{11})}^{2} - {((), {normalS}_{21})}^{2}]}^{1 / 2}

normalμ = n_{r} \times z_{s}

where, k 0 = 2π f / (3 × 10 8 m/s), t s = Width of substrate slab.…”

Section: Studies Of the Proposed Designmentioning

confidence: 99%

A metamaterial hepta‐band antenna for wireless applications with specific absorption rate reduction

Saraswat¹,

Kumar

2019

Int J RF Microw Comput Aided Eng

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Present article embodies the design and analysis of slotted circular shape metamaterial loaded multiband antenna for wireless applications with declination of SAR. The electrical dimension is 0.260 λ × 0.253 λ × 0.0059 λ (35 × 34 × 0.8 mm3) of proposed design, at lower frequency of 2.23 GHz. The antenna consists of circular shape rectangular slot as the radiation element loaded with metamaterial split ring resonator (SRR) and two parallel rectangular stubs, etched rectangular single complementary split‐ring resonator (CSRR) and reclined T‐shaped slot as ground plane. Antenna achieves hepta bands for wireless standards WLAN (2.4/5.0/5.8 GHz), WiMAX (3.5 GHz), radio frequency identification (RFID) services (3.0 GHz), Upper X band (11.8 GHz—for space communication) and Lower KU band (13.1 GHz—for satellite communication systems operating band). Stable radiation patterns are observed for the operating bands with low cross polarization. The SRR is responsible for creating an additional resonating mode for wireless application as well as provide the declination in SAR about 13.3%. Experimental characteristic of antenna shows close agreement with those obtained by simulation of the proposed antenna.

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“…In the former, the resonator is mainly composed of waveguides but usually suffer in large size and cumbersome experimental preparation process. In the later, the resonant techniques based on the planar microstrip line are preferable because of their low cost, lightweight, and ease in fabrication, and it has been the subject of an intensive research activity in the last years …”

Section: Introductionmentioning

confidence: 99%

Improved approach using symmetric microstrip sensor for accurate measurement of complex permittivity

Sun

Tang

2018

Int J RF Microw Comput Aided Eng

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A novel symmetrical planar sensor based on splitter/combiner microstrip sections with a pair of interdigital capacitors (IDCs) and 2 complementary split ring resonators (CSRRs) structure is presented. A high sensitivity area to the dielectric property of surrounding materials has been established by locating IDC unit on the top‐plane while a rectangular CSRR structure etched out on the ground plane. The symmetrical circuit makes the sensitivity further improved to the introduction of sample to be tested because of the destruction of the symmetry. The complex permittivity of the dielectric samples has been evaluated from the actual experimental scattering parameters by using back propagation neural network techniques. The proposed methodology is validated by fabricating the sensor on Rogers5880 substrate and testing various standard dielectric samples viz. PVC, Glass epoxy, FR4, and Glass in C‐band. The measured complex permittivity of the test specimens is found to be in close agreement with their values available in literature with maximum error of <5%.

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Versatile CAD formulation for estimation of the resonant frequency and magnetic polarizability of circular split ring resonators

Cited by 46 publications

References 13 publications

Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting

Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting

A metamaterial hepta‐band antenna for wireless applications with specific absorption rate reduction

Improved approach using symmetric microstrip sensor for accurate measurement of complex permittivity

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