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Numerical and experimental characterization of a button-shaped miniaturized UHF antenna on magneto-dielectric substrate

Published online by Cambridge University Press:  02 May 2013

Martino Aldrigo ,
Alessandra Costanzo ,
Diego Masotti ,
Carlo Baldisserri ,
Ioan Dumitru  and
Carmen Galassi
Martino Aldrigo
Affiliation:
D.E.I., University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy. Phone: +39 051 2093059
Alessandra Costanzo*
Affiliation:
D.E.I., University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy. Phone: +39 051 2093059
Diego Masotti
Affiliation:
D.E.I., University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy. Phone: +39 051 2093059
Carlo Baldisserri
Affiliation:
CNR – ISTEC, Via Granarolo 64, 48018 Faenza (RA), Italy
Ioan Dumitru
Affiliation:
CARPATH, Faculty of Physics University “Al. Ioan Cuza”, Carol I Boulevard 11, 700506 Iaşi, Romania
Carmen Galassi
Affiliation:
CNR – ISTEC, Via Granarolo 64, 48018 Faenza (RA), Italy
*
Corresponding author: A. Costanzo Email: alessandra.costanzo@unibo.it
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Abstract

The design and characterization of a new broadband small patch antenna, based on an innovative magneto-dielectric material and suitable for wearable applications at 868 MHz, is presented. To reduce antenna dimensions, while preserving its radiation and matching performance, a barium-strontium hexaferrite Ba0.75Sr0.25Fe12O19 has been synthesized as the antenna substrate to achieve magnetic permeability double than vacuum in the band of interest. First material realization is characterized and dispersive permittivity and permeability behaviors are included in the design of a small patch antenna with a shorting-plate. A button-size realization is obtained and its suitability for wearable applications is numerically and experimentally demonstrated on body with and without the presence of conductive shielding. Very good agreement with measurements is demonstrated for both matching and radiation performance of the antenna.

Keywords

UHF electrically small antennasMagneto-dielectric substratesWearable systemsHexaferrites
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Special Issue 3: European Microwave Week 2012 , June 2013 , pp. 231 - 239
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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References

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