A 2 × 2 circularly polarized array is presented whose polarization diversity can be electronically controlled. The antenna array utilizes 180° rat-race and two pair of hybrid couplers. The antenna’s CPW feed-line comprises of a reconfigurable sequentially rotated network. Reconfigurable property is achieved by employing two pairs of PIN diodes that determine the right-handed and left-handed circular polarization, known as state1 and state2 respectively. Moreover, vias are used to provide a good transition among CPW feed-line to microstrip-line. Measurements confirm presented array exhibits broadband operation which makes the antenna applicable for C band and IEEE 802.16.a systems. The measured improved and optimized impedance bandwidth of the proposed arrays structure is 3.2–8.0 GHz in state#1 and 3.1–7.7 GHz in state#2 for S₁₁ ≤ − 10 dB and its 3 dB axial ratio is 4.8–7.31 GHz in state#1 and 4.9–7.2 GHz in state#2. The approximately maximum gain of antenna is about 7dBi. The Proposed antenna array with its optimized and modified feed-network is outstanding candidate for wireless communication systems.

提出了一个 2 × 2 圆极化阵列，其极化分集可以电子控制。天线阵列采用 180° 快速旋转和两对混合耦合器。天线的 CPW 馈线由一个可重新配置的顺序旋转网络组成。通过使用两对确定右手和左手圆极化的 PIN 二极管（分别称为 state1 和 state2）来实现可重构特性。此外，通孔用于在 CPW 馈线到微带线之间提供良好的过渡。测量证实所呈现的阵列表现出宽带操作，这使得天线适用于 C 波段和 IEEE 802.16.a 系统。所提出的阵列结构的测量改进和优化阻抗带宽在状态#1 下为 3.2-8.0 GHz，在状态#2 下为 S₁₁  ≤ − 10 dB 且其 3 dB 轴比在状态#1 中为 4.8-7.31 GHz，在状态#2 中为 4.9-7.2 GHz。天线的最大增益大约为 7dBi。提议的天线阵列及其优化和修改的馈电网络是无线通信系统的杰出候选者。