Broadband Characteristics of a Planar Folded Dipole Antenna with a Feed Line

Mio NAGATOSHI  Shingo TANAKA  Satoru HORIUCHI  Hisashi MORISHITA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.5   pp.1168-1173
Publication Date: 2011/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1168
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Diversification of Wireless Technologies)
Category: Antennas and Antenna Measurement
Keyword: 
folded dipole antenna,  planar antenna,  wideband antenna,  

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Summary: 
Various planar folded dipole antennas with feed lines are introduced and analyzed. With the added feed line, the planar folded dipole antenna has two resonance modes. Moreover, adjusting the spacing and width of the feed line improves the broadband characteristics of the antenna. The attached feed line has not only an impedance transforming characteristic but also a bandwidth transforming characteristic. The bandwidth transforming characteristic means that the feed line can broaden the bandwidth of folded dipole antenna. A way to reduce the antenna area is also studied, and the characteristics of the resulting compact antenna are analyzed.