Analysis of an ultra miniature capsule antenna for gastrointestinal endoscopy

Neebha, T. Mary; Nesasudha, M.

doi:10.1016/j.jestch.2018.06.017

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…One of the important criteria in developing such medical devices which already gaining substantial attention from the researchers is the design of a compact in-body antenna that can work in a complex lossy environment like the human body and at the same time can deal with the human safety. Several ongoing researches on the in-body antenna are proposed in (10,11,14,15,(31)(32)(33)52,53,(58)(59)(60)(61) where the types of antennas that being used are dipole, monopole, helical, conformal, patch, and loop antennas which can be found in Table 3. In the event of implantable antennas, the position and orientation are predetermined, patch designs are most commonly chosen because they are highly flexible in design due to the ability to exhibit directive radiation patterns and have a lot of choices of miniaturization techniques and shapes.…”

Section: B Type Of Antenna Design In the Literaturementioning

confidence: 99%

“…Most ingestible antenna in WCE have limitations in antenna size, narrow bandwidth, low radiation or coupling performance, difficulties to comply with the maximum specific absorption rate (SAR) set by certain regulators, variety of human body tissue, orientation changing along the gastrointestinal tract, and influences from other components making the ingestible antenna design for capsule devices even more difficult than other implantable antennas. In Table 5, the smallest area of 25 mm² was addressed to the monopolar wire patch antenna in (58) while the circularly polarized conformal antenna (10) owned the largest antenna area (535 mm²). Metamaterials being utilized in the monopolar wire patch antenna embedded with a Double C-shaped Resonant Structure (DCRS) which is able to produce a strong electric response over any desired frequency at the desired split with wide bandwidth due to the negative permittivity of metamaterials.…”

Section: Miniaturization Of the Antennamentioning

confidence: 99%

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A review of implantable and ingestible antenna for wireless capsule endoscopy system

Tai,

Zulkefli,

Soh

2023

The 15th Universiti Malaysia Terengganu Annual Symposium 2021 (Umtas 2021)

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Wireless medical devices are utilized to obtain physiological signals from the human body to an external monitoring device. The in-body antenna plays a crucial role in ensuring the transmission of physiological signals for implantable or ingestible wireless medical devices. One of the wireless medical devices that involve implantable and ingestible antennas is capsule endoscopy. The implantable one is to be implanted surgically into the human body while the ingestible one is swallowed like a multi-vitamin to perform a wide variety of diagnostic and therapeutic functions in the gastrointestinal (GI) tract. A review of both antennas and their application is presented. Besides, the design of such in-body antenna in the wireless capsule endoscopy especially in current technologies (e.g Wi-Fi, WLAN, Bluetooth, IoT) is extremely challenging and intriguing owing to it deals with the challenges related to the selection of operating frequency band, type of antenna design, and antenna miniaturization technique. Most of the antenna is facing the issue with bandwidth, transmission rate, the robustness of the communication links, size constraint, components arrangement in capsule, and others that could directly affect the patient safety and performance of capsule endoscopy in the human body. Nevertheless, the application of such implantable and ingestible antenna in wireless capsule endoscopy is incessant and rapid growth along with the evolution of technology, thus eliminating any concerns related to the aforementioned challenges and their invasive nature. In this paper, comparative reviews on the design consideration of the in-body antennas are discussed.

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Section: B Type Of Antenna Design In the Literaturementioning

confidence: 99%

Section: Miniaturization Of the Antennamentioning

confidence: 99%

A review of implantable and ingestible antenna for wireless capsule endoscopy system

Tai,

Zulkefli,

Soh

2023

The 15th Universiti Malaysia Terengganu Annual Symposium 2021 (Umtas 2021)

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“…These metamaterials are not naturally available in nature and these are artificially engineered which makes the antenna systems electrically small as well as efficient. Thus a monopole wire patch antenna embedded with a double C shaped resonant (DCR) structure preferable for ingestible WCE system is proposed [10] as shown in Fig. 9.…”

Section: Antenna Architecturesmentioning

confidence: 99%

The quest for a miniaturized antenna in the wireless capsule endoscopy application: a review

Gayen

Biswas

Karmakar³

2021

Int. J. Microw. Wireless Technol.

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This review paper explores the potential use of the planar miniaturized antenna for wireless capsule endoscopy application: one of the promising fields in the current era. The paper highlights the design strategy, various optimization techniques with respect to system realization, material compatibility issues and finally the mandatory EM radiation effect analysis for the said application. It compares amongst various currently reported structures in context with different performance metrics. Inherent challenges of this emerging field of bio-medical engineering have also been detailed here along with futuristic approaches for enhancing the throughput.

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“…In order to reduce the size of the antenna, the dielectric substrate with high relative dielectric constant is selected, the meandering technology with slots or gaps on the surface of the radiation patch and the capacitive loading technology which can offset the inductive impedance are adopted. In order to obtain a wide bandwidth, some literatures adopt fractal technology, multi-resonance coupling structure, multi-layer stacking structure and other methods by reducing the Q value of equivalent resonant circuit [5][6][7][8][9] . Implantable or ingested antennas work in the human body, and the strong coupling between the human body and the antenna affects the electromagnetic characteristics of the antenna.…”

Section: Introductionmentioning

confidence: 99%

Design of Small Circular Polarized Antenna With Ring Descriptive Loading for Biomedical Applications

Ou,

2023

IEEE Access

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A small circular polarized antenna for biomedical applications is designed, which can be used for signal transmission of implantable medical devices or capsule endoscopes. By introducing the ring characteristic loading array, the high electromagnetic energy is aggregated, and the electrical size of the antenna is reduced effectively while the impedance bandwidth is widened. Under the same bandwidth requirement, the antenna size is reduced by about 18 %, and the antenna volume is 80.7 mm 3 . The circular polarization performance of the antenna is generated and adjusted by adding annular slots between the outer ring and the ring descriptive loaded array to generate geometric perturbations. The sensitivity of the complete antenna model to implant in different parts of human body and ingestion of different digestive organs is studied. The biological compatibility, radiation characteristics and safety of the antenna are evaluated. The gain values are -16.8 dBi and -15.6 dBi. The performances of the antenna are tested in pork and simulated digestive tissue solutions. The impedance bandwidths are 24.7 % (2.23 ~ 2.86 GHz) and 20.2 % (2.25 ~ 2.76 GHz) respectively, and the effective communication distance is 11.8m in space. The designed antenna has wide working frequency band, small size, anti-interference and good electromagnetic compatibility, which can meet the working requirements of biological medical equipment after ingestion in digestive organs or implantation in human body.

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Analysis of an ultra miniature capsule antenna for gastrointestinal endoscopy

Cited by 9 publications

References 27 publications

A review of implantable and ingestible antenna for wireless capsule endoscopy system

A review of implantable and ingestible antenna for wireless capsule endoscopy system

The quest for a miniaturized antenna in the wireless capsule endoscopy application: a review

Design of Small Circular Polarized Antenna With Ring Descriptive Loading for Biomedical Applications

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