Abstract
This paper presents a wideband antenna with omnidirectional radiation pattern for wireless capsule endoscopy (WCE) systems. The proposed antenna radiates as slot structure formed between a central copper cylinder and a copper strip attached to the interior surface of biocompatible polyimide shell. Main features of the antenna include: 1) an integrated design of the antenna and electronic components in the capsule is employed. And by utilizing the entire inner space of the capsule, the radiating aperture of antenna is increased to the maximum; 2) the copper cylinder can be used to house electronic components, therefore the potential electromagnetic interferences brought by battery and electronic circuits are reduced to the minimum; 3) the antenna in tissue has a wide bandwidth from 0.721 to 1.705 GHz, covering both 0.902–0.928-GHz industrial, scientific, and medical band and 1.395–1.4-GHz wireless medical telemetry service band; and 4) the antenna inside human tissues has stable omnidirectional radiation patterns across all operating frequencies. This is an indispensable characteristic due to unpredictable orientation of the capsule in gastrointestinal tract. The integrated design concept, wideband impedance matching, and stable omnidirectional radiation patterns make the proposed antenna a promising candidate for future WCE system.
Highlights
Improvement of human health is the key aim of scientific research, and novel products integrated with latest technology for health care and medical diagnosis are in urgent demand
ANTENNA MEASUREMENT The fabricated antenna is composed of three Rogers 4350B substrates, a copper cylinder, a thin layer of foam, one polyimide substrate with two copper strip parts and another polyimide substrate intended to be loaded on top
A wireless capsule antenna is proposed for GI tract diagnosis
Summary
Improvement of human health is the key aim of scientific research, and novel products integrated with latest technology for health care and medical diagnosis are in urgent demand. Our previous work proposed a dual band mixed-polarization capsule antenna, with linearly polarized property at 1.4 GHz WMTS band, and circularly polarized property at 2.45 GHz ISM band [14] These past research works have presented interesting ideas in designing capsule antenna. Slot structure is formed between a central copper cylinder and a copper strip attached to the interior surface of the biocompatible polyimide shell In this way, the entire inner space of the capsule is utilized to maximize the radiating aperture, which helps increase the antenna’s gain-bandwidth product [17]–[19]. A copper cylinder, which can be made hollow to house the battery and other electronic circuits, is introduced within the antenna, minimizing the EMI brought by them This copper cylinder takes part in radiation, which further helps maximize the antenna’s gain-bandwidth product. Due to the capsule’s unpredictable orientation in GI tract, this characteristic helps ensure robust communication between internal capsule antenna and external wearable repeater devices [21]–[24] or monitoring console
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