Abstract
The performance of a broadband circularly polarized crossed-dipole antenna for long-term evolution services is presented in this study. The antenna consists of a pair of trapezoidal-shape dipoles, four trapezoidal parasitic elements, and a pair of three-quarter printed rings that generate a 90° phase difference between the dipoles. The axial ratio (AR) bandwidth is extended using two principal factors in this article. The first one is using trapezoidal parasitic elements, and the second one is employing the feed network in the sequentially rotated technique. Its 2 × 2 array with a sequential-phase feeding network is introduced to achieve a noticeable improvement on the proposed dipole antenna performance. The measured results approve that the impedance and AR bandwidths of the proposed crossed-dipole antenna are 44% (1.95–3.05 GHz) for S11 < −10 dB and 31% (2.2–3 GHz) for AR ≤ 3 dB, respectively. Furthermore, by applying a 2 × 2 array structure for the proposed antenna, the impedance, and AR bandwidths increased by 63% and 31%, respectively. Indeed, using trapezoidal parasitic elements adjacent to the dipole arms leads to generating further surface currents and causes to extend the impedance. A sequential-phase feeding network is in charge of extending the AR bandwidth of the antenna simultaneously.
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