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Abstract
ABSTRACT In this paper, a U-shaped magneto-electric (ME) dipole circularly polarized (CP) microstrip antenna array with an irregular configuration is proposed. The antenna units are composed of a set of similarly irregular U-shaped patches and a set of similarly irregular rectangular patches. These patches couple energy to four metallized openings (acting as magnetic dipoles) through a unique “工”-shaped slit. Subsequently, the energy is transferred to the U-shaped radiating patches (electric dipoles) to obtain the rotating electric field necessary for CP radiation, generating left-handed circularly polarized (LHCP) waves. By arranging the designed antenna units into a 2 × 2 array with sequential rotating feed (SRF), the array achieves an impedance bandwidth (IBW) of 61.7% (20.12–38.08 GHz) and an axial ratio (AR) bandwidth of 52.1% (21.9–37.33 GHz). It exhibits a peak gain of 12.2 dBic, with stable gain within the AR bandwidth range. The average radiation efficiency is above 90%, and the overall size is 2.15λ 0 ×.96λ 0 ×0.17λ 0 . The proposed antenna array boasts several advantages, such as wide impedance and AR bandwidths and ease of integration, making it suitable for a wide range of applications in mm-wave communication systems.
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