Slot-Coupled Circularly Polarized Array Antenna With Substrate-Integrated Waveguide Cavity for Parallel-Plate-Mode Suppression
Slot-Coupled Circularly Polarized Array Antenna With Substrate-Integrated Waveguide Cavity for Parallel-Plate-Mode Suppression
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DOI：
10.1109/tap.2017.2712160
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发表时间：
2017-06
影响因子：
5.7
通讯作者：
Youngsu Kim;Y. Yoon
中科院分区：
文献类型：
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作者：
Youngsu Kim;Y. Yoon
提出了一种适用于相控阵系统的具有平行板模抑制功能的缝隙耦合圆极化贴片天线。采用基片集成波导（SIW）腔体改善了具有PPM抑制的CP阵列天线的辐射性能。为了在馈电电路的馈电点之间获得高隔离度，需要精心设计谐振腔的尺寸和馈电点的位置。此外，所提出的阵列天线的性能进行了深入研究。天线（与无SIW腔）之间的比较研究，包括仿真和测量。所提出的天线与基片集成波导腔具有17 dB的低互耦合水平相比，没有基片集成波导腔的天线;在阵列中的各个天线，因此，呈现出更一致和可靠的特性，在阻抗和辐射性能方面。的波束扫描性能的$8\times 8 $相控阵系统进行了实验验证，并表现出预期的改善方面的增益，交叉极化水平，和轴比。所得到的结果清楚地证明了所提出的天线的CP相控阵系统的优点。
A slot-coupled circularly polarized (CP) patch antenna with parallel-plate-mode (PPM) suppression for phased array systems is presented in this paper. The radiation performances of the CP array antenna with PPM suppression are improved using a substrate-integrated waveguide (SIW) cavity. In order to obtain a high isolation between the feeds of a feeding circuit, the cavity size and locations of the feeds are attentively designed. In addition, the performances of the proposed array antenna are thoroughly investigated. A comparative study between antennas (with and without the SIW cavity) is presented, involving both simulation and measurement. The proposed antenna with the SIW cavity has a 17-dB lower mutual-coupling level compared with the antennas without the SIW cavity; the individual antennas in the array, therefore, present more consistent and reliable characteristics in terms of impedance and radiation performances. The beam scanning performance of an $8 \times 8$ phased CP array system is experimentally validated, and shown to exhibit the expected improvements in terms of gain, cross-polarization level, and axial ratio. The obtained results clearly demonstrate the advantages of the proposed antenna for CP phased array systems.