Abstract
ABSTRACT A dual-band planar dipole antenna, incorporated with a zigzag-shaped dual-band artificial magnetic conductor with gain enhancement, is proposed here. By using 5ร9 AMC surface as substrate to the dipole antenna, the bidirectional radiation pattern of the dipole antenna is transformed to unidirectional radiation pattern. The separation distance between the dipole antenna and the AMC surface is ฮป/6 at 5.5 GHz. The proposed antenna has been fabricated and measured to verify the simulation results. The experimental results ensure good impedance matching (S11 < โ10 dB) over two frequency bands (i.e. 5.1โ6.2 GHz and 6.75โ7.24 GHz). The composite antenna also provides a maximum gain of 8.94 dB at 5.5 GHz with a gain variation of only 0.5 dB over the two operating frequency bands. In addition, the cross-polarization level is less than โ15 dB for both E and H planes.
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