A reconfigurable patch array antenna exhibiting circular polarization as well as pattern switching capabilities is presented in this work. The proposed 2 × 2 series-fed structure is capable of generating 11 switched beams at a resonant frequency of 2.44 GHz. The work also hypothesis an unsophisticated method polarization and radiation pattern diversity. An effective reduction from 2N to N for feed ports and from N to N/2 for phase shifters has also been reported. The design is realized on a single-layered low-cost FR-4 epoxy laminate having a thickness of 1.6 mm. The performance evaluation of the fabricated prototype exhibits good agreement between the computationally evaluated and the experimentally obtained results, yielding six circularly polarized and five 45° slant polarized switched beams in two-dimensional space with appreciably high gain, acceptable side lobe level, and decent impedance matching characteristics for all constituent ports. In this work, a simple four-port beam switching network has been proposed to synthesize the 11 switched beams at an elevation angle of 0°, ±10° and ±21° in xoz-plane and yoz-plane with both circular polarizations and 45° slant polarization. It does not require any additional digital circuit or complex geometry as reported in recent works.

中文翻译：

---

集成波束切换网络的双圆极化串联馈电贴片天线阵列

在这项工作中提出了一种具有圆极化和模式切换能力的可重构贴片阵列天线。所提出的 2 × 2 串联馈电结构能够在 2.44 GHz 的谐振频率下产生 11 个开关光束。这项工作还假设了一种简单的方法极化和辐射模式多样性。还报告了馈电端口从 2N 到 N 和移相器从 N 到 N/2 的有效减少。该设计是在厚度为 1.6 毫米的单层低成本 FR-4 环氧树脂层压板上实现的。制造的原型的性能评估在计算评估和实验获得的结果之间表现出良好的一致性，在二维空间中产生六个圆偏振和五个 45° 倾斜偏振切换光束，增益相当高，可接受的旁瓣电平，以及所有组成端口的良好阻抗匹配特性。在这项工作中，提出了一个简单的四端口波束切换网络来合成 0°、±10° 和 ±21° 仰角的 11 个切换波束。xoz平面和yoz平面具有圆偏振和 45° 倾斜偏振。它不需要最近工作中报告的任何额外的数字电路或复杂的几何形状。