A New Scheme to Enhance Bandwidth of Printed Dipole for Wideband Applications

Dinh Thanh LE  Nguyen Quoc DINH  Yoshio KARASAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E97-B   No.4   pp.773-782
Publication Date: 2014/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.773
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
printed antennas,  dipole,  mutual coupling,  ultra-wideband antennas,  reconfigurable antennas,  

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Summary: 
This paper presents a new technique to enhance the bandwidth of a printed dipole antenna for ultra-wideband applications. The basic idea is to exploit mutual coupling between the feeding line, which is designed closed and paralleled to dipole arms, the dipole arms and other elements of the antenna. Dipole arms, feeding lines as well as other parts are investigated in order to expand antenna bandwidth while still retaining antenna compactness. Based on the proposed technique, we develop two sample printed dipole antennas for advanced wireless communications. One is an ultra-wideband antenna which is suitable for multi-band-mode ultra-wideband applications or being a sensing antenna in cognitive radio. The other is a reconfigurable antenna which would be applicable for wideband cognitive radios. Antenna characteristics such as radiation patterns, current distributions, and gains at different frequencies are also investigated for both sample antennas.