University of Oulu

Chaïmaâ Kissi, Mariella Särestöniemi, Timo Kumpuniemi, et al., “Reflector-Backed Antenna for UWB Medical Applications with On-Body Investigations,” International Journal of Antennas and Propagation, vol. 2019, Article ID 6159176, 17 pages, 2019.

Reflector-backed antenna for UWB medical applications with on-body investigations

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Author: Kissi, Chaïmaâ1; Särestöniemi, Mariella2; Kumpuniemi, Timo2;
Organizations: 1Electronics and Telecommunication Systems Research Group, National School of Applied Sciences (ENSA), Ibn Tofai University, Kenitra, Morocco
2Centre for Wireless Communications, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
3Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
4Department of Electrical and Computer Engineering, Purdue University, Fort Wayne, IN 46805, USA
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 9 MB)
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Language: English
Published: Hindawi, 2019
Publish Date: 2019-10-18


A recent reflector-backed antenna model is proposed in this paper for wireless capsule endoscopy localization. The antenna is designed to operate at the lowest 802.15.6 mandatory UWB (ultrawideband) channel, i.e., 4 GHz center frequency with 500 MHz bandwidth. The antenna achieves a good directivity and radiates well over the frequency band of interest. The proposed antenna was constructed within three successive steps. Initially, a planar omnidirectional antenna was designed of 3.15 dBi gain at 4 GHz. Since the antenna aims to operate as a receiving antenna, good directivity is preferred. Thus, an air-filled cavity was included backing the planar antenna to bolster the directivity toward the radiating element. The cavity-backed antenna has a measured gain of 6.4 dBi. The antenna was evaluated next to the homogenous and multilayer models. Then, the antenna design was optimized, by reducing its size, to a reflector-backed antenna structure reaching a maximum gain of 5.3 dBi, which is still promising for the regarded application. The body effect on the antenna matching was evaluated by means of multilayer and voxel models simulating the human body. This was followed by on-body measurements involving real subject. The depth of in-body propagation, from skin to small intestine, was studied using the multilayer and voxel models. Simulations were run using the CST Microwave Studio tool. While prototyping, free-space and on-body measurements took place at University of Oulu, Finland.

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Series: International journal of antennas and propagation
ISSN: 1687-5869
ISSN-E: 1687-5877
ISSN-L: 1687-5869
Article number: 6159176
DOI: 10.1155/2019/6159176
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The work was partly supported by the Academy of Finland project 6Genesis Flagship (grant no.318927).
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
Copyright information: © 2019 Chaïmaâ Kissi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.