Broadband Sleeve Dipole Antenna with Consistent Gain in the Horizontal Direction

Takatsugu FUKUSHIMA  Naobumi MICHISHITA  Hisashi MORISHITA  Naoya FUJIMOTO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E101-B   No.4   pp.1061-1068
Publication Date: 2018/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3326
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
broadband,  sleeve dipole antennas,  choke structures,  parasitic elements,  omnidirectional antennas,  

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Summary: 
This paper improves radiation patterns and impedance matching of a broadband sleeve dipole antenna. A broadband sleeve dipole antenna is designed and the effect of the structure parameters on the |S11| characteristics is calculated. Current distributions of the resonance frequencies are calculated. A broadband sleeve dipole antenna with plate element is proposed. Better impedance matching is obtained by adjusting the size of the plate element. The nulls of the radiation patterns are reduced at high frequencies and the gain in the horizontal direction is improved.