Examination of Impedance Response of Capsule- Integrated Antennas Through Gastrointestinal Tract

Cil, Erdem; Dumanlı, Sema; Nikolayev, Denys

doi:10.23919/eucap53622.2022.9768918

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…Our analysis strategy is based on three common types of antennas [see Fig. 2(a)-(c)]: the meandered dipole and the meandered loop antenna, which are presented in [45], and the patch antenna comprising of two identical low-impedance radiating elements connected with a high-impedance meandered microstrip line, which is reported in [46]. The antennas are designed on a 100-µm-thick Rogers CLTE-MW substrate (ε r = 2.97) [47] and conform to the inner surface of 32 mm × 12 mm biocompatible polylactic-acid capsules (PLA, ε r = 2.7, tan δ = 0.003) having a shell thickness t, as seen in Fig.…”

Section: Antenna Models and Measurement Setup A Antenna Models And Nu...mentioning

confidence: 99%

“…This approach provides further insights into finding the trade-off between the sensitivity of the antenna to surrounding tissues and its radiation performance. The optimized values for this study of the parameterized dimensions of the antennas (with the parametrization provided in [45] and [46]) are tabulated in Table II. The feed gap of all dipole antennas and the loop antenna for t = 0.2 mm equals 0.25 mm, whereas it is 1 mm for the loop antenna for t = 0.4 mm and t = 0.6 mm.…”

Section: Antenna Models and Measurement Setup A Antenna Models And Nu...mentioning

confidence: 99%

“…ε r = 63, σ = 1.02 S/m at 434 MHz). The detailed fabrication procedure of this phantom can be found in [45]. The dimensions of the phantom and the capsule are the same as in Fig.…”

Section: Gain and Radiation Efficiency Analysismentioning

confidence: 99%

“…The derivation of the theoretical bounds is performed using the methodology given in [44] with the parameters L = 20 mm, R c = 6 mm, T = 0.2 mm, and R p = 50 mm, replicating the models implemented in this work. The phantom has the time-averaged EM properties of the GI tract that are calculated for the frequency interval [300-2500] MHz using the approach explained in [45] and the values in [39] and [51]. The theoretical bounds established for these source dimensions in the given standard phantom are compared with the obtained η values of the antennas.…”

Section: B Different Operating Frequenciesmentioning

confidence: 99%

“…Additionally, the paper compares the η results with the theoretical maximum achievable radiation efficiency [44]. Compared to the previous work [41], [43], [45], this paper is the first to examine the performance of different types of ingestible antennas in terms of their operational parameters for multiplexed gastrointestinal (GI) sensing and communication. The results presented provide essential guidelines for engineers designing multiplexed biosensing antennas for in-body applications.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On the Use of Impedance Detuning for Gastrointestinal Segment Tracking of Ingestible Capsules

Cil

Soares

Renaudeau

et al. 2023

IEEE Trans. Antennas Propagat.

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Ingestible sensor devices, which are increasingly used for internal health monitoring, rely on antennas to perform sensing functions and simultaneously to communicate with external devices. Despite the development of various ingestible antennas, there has been no comprehensive comparison of their performance as biosensors. This paper addresses this gap by examining and comparing the suitability of three common types of ingestible antennas-dipole, patch, and loop-as biosensors for distinguishing gastrointestinal tissues (stomach, small intestine, and large intestine) based on their electromagnetic properties. The antennas studied in this work conform to the inner surface of biocompatible polylactic acid capsules with varying shell thicknesses and operate in the 433 MHz Industrial, Scientific, and Medical band. The comparison is performed in gastrointestinal tissues using several antenna parameters: 1) Sensing Capability: Changes in the phase of the reflection coefficient in the tissues are selected as the sensing parameter. 2) Robustness: The frequency interval (∆ f i ) in which the antennas are matched (|S 11 | < -10 dB) in all the tissues and the maximum change in the center frequency ( f c ) in different tissues are examined. 3) Radiation Performance:The gain and radiation efficiency of the antennas are examined. The effect of shell thickness on gain and radiation efficiency at 434 MHz is presented. Additionally, the radiation efficiency at various frequencies allocated for medical communications is compared with the theoretical maximum achievable efficiencies. These comprehensive data provide valuable information for making engineering decisions when designing multiplexed biosensor antennas for ingestible applications.

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Section: Antenna Models and Measurement Setup A Antenna Models And Nu...mentioning

confidence: 99%

Section: Antenna Models and Measurement Setup A Antenna Models And Nu...mentioning

confidence: 99%

“…ε r = 63, σ = 1.02 S/m at 434 MHz). The detailed fabrication procedure of this phantom can be found in [45]. The dimensions of the phantom and the capsule are the same as in Fig.…”

Section: Gain and Radiation Efficiency Analysismentioning

confidence: 99%

Section: B Different Operating Frequenciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the Use of Impedance Detuning for Gastrointestinal Segment Tracking of Ingestible Capsules

Cil

Soares

Renaudeau

et al. 2023

IEEE Trans. Antennas Propagat.

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A sub 1 GHz ultra miniaturized folded dipole patch antenna for biomedical applications

Chishti

Aziz

Aljaloud

et al. 2023

Sci Rep

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A miniaturized folded dipole patch antenna (FDPA) design for biomedical applications operating at sub 1 GHz (434 MHz) band is presented. Antenna is fabricated on FR-4 substrate material having dimensions of 16.40 mm $$\times$$ × 8.60 mm $$\times$$ × 1.52 mm (0.023$$\lambda$$ λ $$\times$$ × 0.012$$\lambda$$ λ $$\times$$ × 0.002$$\lambda$$ λ ). Indirect feed coupling is applied through two parallel strips at bottom layer of the substrate. The antenna size is reduced by 83% through lumped inductor placed at the center path of the radiating FDPA, suitable for biomedical (implantable) applications and hyperthermia. Moreover, Impedance matching is achieved without using any Balun transformer or any other complex matching network. The proposed antenna provides an impedance bandwidth of 6 MHz (431–437 MHz) below − 10 dB and a gain of − 31 dB at 434 MHz. The designed antenna is also placed on a human body model to evaluate its performance for hyperthermia through Specific Absorption Rate (SAR), Effective Field Size (EFS), and penetration depth (PD).

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Ultra-Miniaturized Camera Integrated Antenna for Wireless Capsule Endoscopy

Qamar

Kapusuz

Ejaz

et al. 2023

2023 17th European Conference on Antennas and Propagation (EuCAP)

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Examination of Impedance Response of Capsule- Integrated Antennas Through Gastrointestinal Tract

Cited by 6 publications

References 15 publications

On the Use of Impedance Detuning for Gastrointestinal Segment Tracking of Ingestible Capsules

On the Use of Impedance Detuning for Gastrointestinal Segment Tracking of Ingestible Capsules

A sub 1 GHz ultra miniaturized folded dipole patch antenna for biomedical applications

Ultra-Miniaturized Camera Integrated Antenna for Wireless Capsule Endoscopy

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