A Highly Miniaturized and Inherently Conjugately Matched Folded Dipole-Based RFID Tag Antenna

Das, Sanghamitro; Saghlatoon, Hossein; Mousavi, Pedram; Iyer, Ashwin K.

doi:10.1109/access.2019.2930956

Cited by 13 publications

(14 citation statements)

References 19 publications

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“…The proposed antenna is very stable in free space and on the following surfaces: human tissue, plastic containers filled with water, metal, etc. A plate with a size of 120 × 120 × 60 mm 3 is included in the simulation model to mimic the background of the tag antenna. A simplified model of a human body and a water-filled container are illustrated in Figure 5.…”

Section: Discussion and Multi-usagementioning

confidence: 99%

“…The thickness of the water-filled plastic container used for measurement is 1 mm, and the total size is 160 × 80 × 80 mm 3 , corresponding to a water thickness is 78 mm. The tag antenna is attached on the center of the container's wide-sided surface.…”

Section: Discussion and Multi-usagementioning

confidence: 99%

“…Many radio frequency identification (RFID) tag antennas for ultra‐high frequency (UHF) band have been designed in the previous work 1‐5 . With these designs, some of the tag antennas can be mounted on metallic surfaces directly, 6,7 other reported designs can work on the human body, organs, blood bag and water‐filled containers 8‐11 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Circular multi‐usage RFID tag antenna with coding ability for chipless application

Tang

Olaimat

Aldhaeebi

et al. 2020

Int J RF Microw Comput Aided Eng

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A circular tag antenna for the ultra-high frequency radio frequency identification band, with an outer radius of 25 mm is proposed. The proposed design consists of a loop radiation element, two symmetrical microstrip feed lines, resonant rings, and resonant arms. Simulation and measurement results show that the proposed antenna can operate steadily in free space, and on the surface of the human body, water-filled container, and metal along with good conjugate impedance matching. The maximum measured reading range of 3.6 to 6.9 m can be achieved depending on the background. Utilizing a matching circuit, parallel combination of an inductor and capacitor at the feeding port, a point frequency working state at any frequency can be realized. Consequently, it can be used as a frequency signature chipless tag with coding capability. K E Y W O R D S chipless, coding, multi-usage, RFID, tag antenna 1 | INTRODUCTION Many radio frequency identification (RFID) tag antennas for ultra-high frequency (UHF) band have been designed in the previous work. 1-5 With these designs, some of the tag antennas can be mounted on metallic surfaces directly, 6,7 other reported designs can work on the human body, organs, blood bag and water-filled

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Section: Discussion and Multi-usagementioning

confidence: 99%

Section: Discussion and Multi-usagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Circular multi‐usage RFID tag antenna with coding ability for chipless application

Tang

Olaimat

Aldhaeebi

et al. 2020

Int J RF Microw Comput Aided Eng

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show abstract

“…In the next phase, parallel-plate capacitors are introduced on the cylindrical driven arm at a distance l/4 from the antenna ends, as shown in Fig. 2(b), following the loading-capacitance locations used in [17] - [19]. The individual parallel plate is circular in shape, with a radius r c and a thickness t c .…”

Section: B Antenna Structurementioning

confidence: 99%

“…Unlike the technique described in [14] - [16], this new technique makes use of the intrinsic first antiresonance of the folded dipole antenna that occurs naturally at a lower frequency than the half-wavelength resonance, and engineers the input impedance around it by applying simple series inductive and series capacitive loading to facilitate matching. It was also shown that this technique could more generally be used to match complex source impedances, and thus is suitable for such narrowband applications as RFID [19]. However, since the miniaturized folded dipole antennas reported in [17] - [18] were not spherical in shape, there remains an opportunity to enhance their bandwidths using such an approach.…”

Section: Introductionmentioning

confidence: 99%

Design of a Highly Miniaturized, Inherently Matched, Spherical Folded Dipole Antenna and Evaluation of its Quality Factor

Iyer¹,

Das²

2021

Preprint

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<div>A highly miniaturized three-dimensional spherical folded dipole antenna has been reported, for which inherent impedance matching is achieved with respect to a practical source impedance by employing a simple series-LC loading combination, thereby engineering its input impedance. In order to maximize its bandwidth, the miniaturized antenna employs a bifilar spherical helix that maximizes use of the volume of the corresponding Chu sphere. Full-wave simulations show that the resulting antenna demonstrates excellent impedance matching and over 95% radiation efficiency even when miniaturized by 85% in comparison to a resonant dipole operating at the same frequency. Furthermore, various quality-factor definitions for the miniaturized spherical folded dipole antenna were estimated. It is observed that, owing to the use of proximate but non-overlapping resonances, two of these definitions fall below the Chu lower bound around the frequency of operation, resulting in a fractional bandwidth larger than that predicted by the Chu limit.</div>

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On the Performance of a Miniaturized Reactive Loaded Monopole Antenna for Ex Vivo Catheter Applications

2023

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In this paper, we propose a miniaturized series L-C loaded monopole antenna for catheter application in microwave ablation systems. Initially, a quarter wavelength long monopole antenna (De-sign1), having length 30 mm (≈ 0.24λ 0 where λ 0 represents the free-space wavelength at 2.4 GHz operating frequency) using series LC loading concept is designed. The initial design is further extended to a miniaturized version (Design2) having length 5 mm (≈ 0.04λ 0 ), showing nearly 83% size reduction compared to its former.Both the antennas are designed and simulated by immersing inside high permittivity egg white phantom (ϵ r = 63.84). Antenna Design 1 and 2 exhibit good impedance matching (S 11 < −12 dB) at and around the operating frequency with uniform monopolar radiation pattern having co-to-cross isolation of nearly 30-35 dB. Further, the in-phantom Specific Absorption Rate (SAR) values for both antennas are evaluated using simulation and verified with the measured SAR values such as 22 W/kg and 19.6 W/kg for Design1 and 2 respectively, using an in-house experimental setup. Moreover, the microwave ablation property of the proposed antennas is studied using simulated transient thermal gradient which translates to ablation zone formation. Here, Design 2 shows the advantage of having a low invasive diameter of 1.5 mm and near unity aspect ratio (AR) for the ablation zone as compared to Design1.

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A Highly Miniaturized and Inherently Conjugately Matched Folded Dipole-Based RFID Tag Antenna

Cited by 13 publications

References 19 publications

Circular multi‐usage RFID tag antenna with coding ability for chipless application

Circular multi‐usage RFID tag antenna with coding ability for chipless application

Design of a Highly Miniaturized, Inherently Matched, Spherical Folded Dipole Antenna and Evaluation of its Quality Factor

On the Performance of a Miniaturized Reactive Loaded Monopole Antenna for Ex Vivo Catheter Applications

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