Wideband Circularly Polarized 2 × 2 Antenna Array With Multibeam Steerable Capability
Wideband Circularly Polarized 2 × 2 Antenna Array With Multibeam Steerable Capability
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DOI：
10.1109/lawp.2016.2576019
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发表时间：
2017
影响因子：
4.2
通讯作者：
H. Tran;I. Park
中科院分区：
文献类型：
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作者：
H. Tran;I. Park
本文介绍了一种能够在半球面空间产生九束可操纵波束的圆极化开关波束天线阵列。首先构造了两个三角形偶极子穿过印刷环的单一辐射体，并引入了四个寄生元件来提高CP操作带宽。对于波束导向操作，其阵列天线采用$2 \ × 2$布置，并由四个双箱支路耦合器组成的四输入端口馈电网络馈电。通过适当的馈源激励机制，该天线可以产生9个方向的CP轴向波束。天线的总体尺寸为$2{\rm{\lambda}}_{\rm{o}}} \乘以2{{\rm{\lambda}}_{\rm{o}}} \乘以0.2{{\rm{\lambda}}_{\rm{o}}}$ (6 GHz)，测量结果表明，该设计提供了非常宽的- 10db阻抗和3db轴比带宽分别为48.6%和46.2%。此外，在每个波束方向上都观测到稳定的辐射模式，增益约为11.5 dBic，辐射效率大于90%。
A circularly polarized (CP) switched-beam antenna array with the capability of generating nine steerable beams in the hemispherical space is presented in this letter. A single radiator is first constructed with two triangular-shaped dipoles crossing through printed rings, and four parasitic elements are introduced to enhance the CP operation bandwidth. For the beam steering operation, its array antennas are implemented in a $2 \times 2$ arrangement and fed by a four-input port feeding network composed of four double-box branch-line couplers. With a suitable feed excitation mechanism, the proposed antenna can generate CP axial beams in nine directions. The antenna is fabricated with an overall size of $2{{\rm{\lambda }}_{\rm{o}}} \times 2{{\rm{\lambda }}_{\rm{o}}} \times 0.2{{\rm{\lambda }}_{\rm{o}}}$ (at 6 GHz), and the measured results demonstrate that the proposed design provided very wide −10-dB impedance and 3-dB axial-ratio bandwidths of 48.6% and 46.2%, respectively. Additionally, stable radiation patterns with a gain of approximately 11.5 dBic and radiation efficiency of greater than 90% were observed for every beam direction.