60 GHz Wideband High-Gain Circularly Polarized Antenna Array With Substrate Integrated Cavity Excitation
60 GHz Wideband High-Gain Circularly Polarized Antenna Array With Substrate Integrated Cavity Excitation
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DOI：
10.1109/lawp.2018.2814051
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发表时间：
2018-05-01
影响因子：
4.2
通讯作者：
Xue, Quan
中科院分区：
文献类型：
--
作者：
Zhu, Jianfeng;Liao, Shaowei;Xue, Quan
这封信介绍了一种适用于 60 GHz 应用的新型宽带高增益圆极化 (CP) 基板集成腔体激励天线阵列。首先，提出了一种2×2单元的CP阵列，以孔径耦合双臂螺旋天线作为辐射单元，可以表现出良好的CP辐射性能。代替传统的有损且复杂的馈电网络，采用基于高阶模（TE340）腔谐振的简单但高效的激励结构来为阵列馈电。高阶模腔以相同的相位和幅度向所有辐射元件供电，并且谐振模式由单槽孔激发。然后，所提出的 2 x 2 元素 CP 阵列用作子阵列来实现顺序旋转馈送的 4 x 4 元素 CP 阵列。测量结果表明，该阵列具有超过18.8%（53-64 GHz）的宽轴比带宽，在61 GHz处峰值增益达到20 dBic。阵列的辐射方向图通常是对称的，其主波束固定在视轴上。
This letter presents a new wideband high-gain circularly polarized (CP) substrate integrated cavity excited antenna array for the 60 GHz applications. First, a 2 x 2-element CP array is proposed with an aperture-coupled two-arm spiral antenna as its radiating element, which can exhibit good CP radiation performance. Instead of the conventional lossy and complicated feed network, a simple but efficient excitation structure based on higher-order-mode (TE340) cavity resonance is used to feed the array. The higher-order-mode cavity feeds all of the radiating elements in the same phase and magnitude, and the resonant mode is excited by a single slot aperture. Then, the proposed 2 x 2 element CP array is used as subarray to implement a sequential-rotationally fed 4 x 4-element CP array. Measured results show that the array has a wide axial-ratio bandwidth of more than 18.8% (53-64 GHz) with a peak gain reaching 20 dBic occurring at 61 GHz. The radiation patterns of the array are generally symmetrical with its main beam fixed at boresight.