T-matched dipole antenna integrated in electrically small body-worn wireless sensor node

Author

Cheng, Shukang ; Hallbjorner, P. ; Rydberg, A. ; Vanotterdijk, D. ; van Engen, P.

Author_Institution

Signals & Syst. Group, Uppsala Univ., Uppsala

Volume

3

Issue

5

fYear

2009

fDate

8/1/2009 12:00:00 AM

Firstpage

774

Lastpage

781

Abstract

A 2.4 GHz antenna for an electrically small body-worn sensor node is presented. Usually, unbalanced antennas are used in such applications. Implementing a balanced antenna in a small node deployed on the body is problematic from the points of view of both design and characterisation. A solution using a T-matched dipole integrated in the node housing is presented. Techniques for characterisation both in free space and on the body are described. Besides antenna port impedance and radiation efficiency, radiated power and radiation patterns of the active antenna fed by a transceiver in a fully functional sensor node are measured. The benefits and drawbacks of the chosen antenna design and characterisation techniques are discussed.

Keywords

active antennas; antenna feeds; antenna radiation patterns; body area networks; dipole antennas; impedance matching; transceivers; wireless sensor networks; T-matched dipole antenna design; active antenna feed; antenna port impedance matching; antenna radiation pattern; body area network; electrically small body-worn wireless sensor node housing; frequency 2.4 GHz; wireless transceiver;

fLanguage

English

Journal_Title

Microwaves, Antennas & Propagation, IET

Publisher

iet

ISSN

1751-8725

Type

jour

DOI

10.1049/iet-map.2008.0218

Filename

5161687