A Conformal Quasi-Isotropic Dielectric Resonator Antenna for Wireless Capsule Endoscope Application

Abstract

A conformal quasi-isotropic dielectric resonator antenna (DRA) is first investigated for wireless capsule endoscope (WCE) application under the 5.8-GHz industrial, scientific, and medical (ISM) standard. The probe-fed hemispherical DRA (HDRA) is studied to match the shape of the spherical dome end, and the characteristic mode analysis (CMA) tool is applied to analyze the resonant modes of the proposed antenna to reveal the intrinsic behavior of the dielectric resonator. It is found that the quasi-isotropic radiation pattern can be achieved by combining HDRA's TE 111 sin ϕ mode which radiates like a magnetic dipole and a small ground plane's TM 10 mode that radiates like an electric dipole. In order to reach the requirement of 5.8 GHz in ISM, a ceramic hemispherical dielectric resonator with dielectric constant of 21.984 is investigated. The radius of the hemisphere is set to 5.35 mm. In free space, the measurement results show that the proposed antenna achieves 3.25% bandwidth, 86% maximum efficiency, and 7.2 dB gain deviation. The antenna is also measured in pork to approximate human body environment. The measurement results demonstrate that the antenna achieves 3.20% bandwidth, 8.15% maximum efficiency, and 9.0 dB gain deviation. Accordingly, the proposed antenna is suitable for WCE application at 5.8 GHz ISM standard.

Design and Development of a Near Isotropic Printed Arc Antenna for Direction of Arrival (DoA) Applications

“…Such antennas are useful in applications where the relative position of the receive and the transmit antennas is uncertain or keeps changing. Radio Frequency Identification (RFID) systems, wireless endoscopy, energy harvesting, wireless Access Points (APs), Internet of Things (IoTs), and antennas for Satellites and drones are examples of such applications [1][2][3][4][5][6].…”

A Multi-Band Cylindrical Conformal Antenna With Low Specific Absorption Rate for Wireless Medical Capsule Endoscopy

“…The wireless medical capsule endoscopy (WMCE) is promising in medical domain owing to its more convenient technique than traditional endoscopy on gastrointestinal (GI) operation. WMCE provides accurate diagnostic information by establishing a communication link between the in-body device and outside equipment [1][2][3]. In WMCE systems, the antenna is one of the most pivotal components, which can ensure information transmission [4] rate in the link.…”