A Tunable Dual-Band Miniaturized Monopole Antenna for Compact Wireless Devices

Author

Ouedraogo, Raoul O. ; Tang, Ju ; Fuchi, Kazuko ; Rothwell, Edward J. ; Diaz, Alejandro R. ; Chahal, Premjeet

Author_Institution

Dept. of Electr. & Comput. Eng., Michigan State Univ., East Lansing, MI, USA

Volume

13

fYear

2014

fDate

2014

Firstpage

1247

Lastpage

1250

Abstract

A technique for producing miniaturized tunable planar monopole antennas for wireless communication applications is introduced. Miniaturization is achieved by optimizing the geometry of a pixelated metallic patch surrounding the monopole antenna. Tuning of the antenna is implemented by varying the capacitance of a varactor diode loaded between the pixelated metallic patch and the ground plane. The result is an ultra-compact, dual band, folded monopole antenna that fits into a hemisphere of radius λ₀/20 at 2.1 GHz. Varying the capacitance of the varactor diode enables the two resonance frequencies to be tuned simultaneously, covering multiple frequency bands for different wireless applications. A prototype antenna has been fabricated and measured, confirming the feasibility of the proposed design.

Keywords

UHF antennas; microstrip antennas; monopole antennas; multifrequency antennas; radiocommunication; varactors; broadband antennas; compact wireless devices; frequency 2.1 GHz; ground plane; multiple frequency bands; pixelated metallic patch geometry; resonance frequency; tunable dual-band miniaturized monopole antenna; ultra-compact dual band folded monopole antenna; varactor diode capacitance; wireless communication; Antennas; Capacitance; Image quality; Prototypes; Resonant frequency; Tuning; Varactors; Broadband antennas; genetic algorithms; miniaturization; tunable circuits and devices; varactors; wireless communication;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2014.2332752

Filename

6842667