A Planar High-gain Circularly Polarized Dipole Antenna Based on PRAMC for 2.45 GHz ISM Band
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Abstract
This paper presents a novel planar circularly polarized (CP) dipole antenna for 2.45 GHz ISM band wireless communications based on a polarization rotation artificial magnetic conductor (PRAMC). The design evolution begins with a linearly polarized (LP) dipole antenna, followed by the dipole antenna loaded with a 2×2 AMC array, and culminates in the proposed CP dipole antenna incorporating a 2×2 PRAMC array. Unlike conventional AMC arrays that only enhance gain, the proposed PRAMC array can convert LP radiation to CP radiation and further enhance the gain of the dipole antenna. Measured results indicate that the proposed antenna has the −10 dB impedance bandwidth (BW) of 29.8% (2.21–2.94 GHz), the 3 dB axial ratio (AR) BW of 7.0% (2.35–2.52 GHz), a peak gain of 7.01 dBi, indicating left-hand CP (LHCP) at 2.45 GHz. Finally, the experimental results validate that the proposed PRAMC can convert a low-gain LP dipole antenna into a high-gain CP dipole antenna.
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