Abstract
A novel horizontally polarized omnidirectional antenna is presented in this letter. It consists of an inner ring radiator, an outer ring radiator and a 1 to 8 power divider as the feeding network. The inner ring radiator is composed of eight arc-shaped elements arranged symmetrically. Because they are excited with the same phase and magnitude, eight arc-shaped branches produce a uniform current in the same direction, which can yield the horizontally polarized omnidirectional patterns. Furthermore, an outer ring is loaded, and it is fed by energy coupling. Due to the size difference of two rings, they can generate two resonance points with close frequency, thus broadening the bandwidth of the antenna. Simulated results show that the proposed antenna achieves a -10 dB |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | with bandwidth of 2.17-2.86GHz (27.4 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> ). Meanwhile, the size of the antenna is only 0.29λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> ×0.29λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> ×0.006AL, where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> is the free space wavelength at the lowest operational frequency.
Published Version
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