Bandwidth Enhancement of a Compact Transverse Bilateral Helical Antenna With Parasitic Element for Mobile Device Applications

Author

Celebi, Adem ; Kenkel, Mark ; Wong, Thomas T. Y.

Author_Institution

Dept. of Electr. & Comput. Eng., Illinois Inst. of Technol., Chicago, IL, USA

Volume

63

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

937

Lastpage

945

Abstract

An electrically small antenna (ESA) designed for portable communication device applications is described. The antenna structure is based on the introduction of parasitic element to the transverse bilateral helical (TBH) antenna to enhance the bandwidth, leading to the TBH antenna with parasitic elements (TBHP). By insertion of a second helix into the core of the host helix, the overall dimensions of the antenna structure are kept the same as the original TBH antenna. A first-order analytical model is developed to gain insight to the design process. Performance of the TBHP antenna is evaluated using finite element method (FEM) electromagnetic simulation. The experimental and simulation data showed that the TBHP antenna has 105% wider bandwidth in a 50-Ω reference system and 74% higher radiation efficiency around the 621-MHz operating frequency compared with the original TBH antenna. Simulation and measurement results are found to be in good agreement.

Keywords

UHF antennas; antenna radiation patterns; finite element analysis; helical antennas; mobile antennas; ESA; FEM electromagnetic simulation; TBH antenna with parasitic elements; TBHP; antenna structure; bandwidth enhancement; compact transverse bilateral helical antenna; design process; electrically small antenna; finite element method; first-order analytical model; frequency 621 MHz; host helix; mobile device; portable communication device; resistance 50 ohm; Antenna measurements; Bandwidth; Dipole antennas; Helical antennas; Impedance; Antennas with parasitic elements; Electrically small antennas; Helical antennas; Loop antennas; electrically small antennas (ESAs); helical antennas; loop antennas;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2014.2388220

Filename

7001035