Abstract
In this paper, an orthogonally polarized antenna with a small diameter and low profile is proposed for mobile communication. The proposed antenna is composed of a Halo antenna loaded with two parasitic elements as the horizontal polarization element and dipole or sleeve antennas as the vertical polarization elements inside the Halo antenna. The simulation results show that the proposed antenna with the sleeve antenna has a relative bandwidth of 6.9 % (VSWR < 2) and an isolation between polarizations of about 30 dB within the operating frequency. In addition, the antenna diameter and height of the proposed antenna are 0.14λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> and 0.49λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> (λ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf> : the wavelength of the center operational frequency), respectively. Also, a low profile orthogonally polarized antenna is obtained.
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