Low profile tunable dipole antenna using BST varactors for biomedical applications

Author

Cure, David ; Weller, Thomas M. ; Miranda, F.A. ; Price, Tony

Author_Institution

Dept. of Electr. Eng., Univ. Of South Florida, Tampa, FL, USA

fYear

2013

fDate

7-13 July 2013

Firstpage

570

Lastpage

571

Abstract

In this paper a 2.4 GHz low profile (λ/47) tunable dipole antenna is evaluated in the presence of a human core model (HCM) body phantom. The antenna uses a frequency selective surface (FSS) with interdigital barium strontium titanate (BST) varactor-tuned unit cells and its performance is compared to a similar low profile antenna that uses an FSS with semiconductor varactor diodes. The measured data of the antenna demonstrate tunability from 2.2 GHz to 2.55 GHz in free space and impedance match improvement in the presence of a HCM at different distances. This antenna has smaller size, lower cost and less weight compared to the semiconductor varactor diode counterpart.

Keywords

UHF antennas; UHF diodes; barium compounds; biomedical electronics; dipole antennas; frequency selective surfaces; impedance matching; varactors; BST varactors; BaSrTiO₃; FSS; HCM body phantom; biomedical applications; frequency 2.2 GHz to 2.55 GHz; frequency selective surface; human core model; impedance matching; interdigital barium strontium titanate varactor-tuned unit cells; low profile tunable dipole antenna; semiconductor varactor diodes; Antenna measurements; Dipole antennas; Frequency selective surfaces; Impedance; Robustness; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE

Conference_Location

Orlando, FL

ISSN

1522-3965

Print_ISBN

978-1-4673-5315-1

Type

conf

DOI

10.1109/APS.2013.6710945

Filename

6710945