45 GHz Wideband Circularly Polarized Planar Antenna Array Using Inclined Slots in Modified Short-Circuited SIW
45 GHz Wideband Circularly Polarized Planar Antenna Array Using Inclined Slots in Modified Short-Circuited SIW
复制标题
在改进的短路 SIW 中使用倾斜槽的 45 GHz 宽带圆极化平面天线阵列
DOI：
10.1109/tap.2018.2888984
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发表时间：
2019-03-01
影响因子：
5.7
通讯作者：
Mittra, Raj
中科院分区：
文献类型：
--
作者：
Zhang, Yan;Hong, Wei;Mittra, Raj
本文从阻抗匹配和轴比两个方面提出了一种Q波段宽带平面圆极化天线阵。首先在基片集成波导（SIW）宽壁上引入一个中心45度倾斜的缝隙，并采用改进的短路终端，实现宽带45度线极化辐射，同时引入一对电感通孔进行阻抗匹配。然后，正交集成两个建议的槽与SIW 90度定向耦合器，宽带CP元件的设计和其波束表现出良好的AR在一个方向上的一个相对较宽的角区域。在此基础上，采用双层基片集成波导设计了一个CP天线阵列。四个CP元件以旋转的方式布置在顶层中，并且它们以90度的增量相位延迟由底层中的四路功分器顺序馈电，以实现锥形CP波束和更高的增益。在宽工作频带内，对功分器和跨层耦合槽的性能进行了测试。在Q波段对所设计的CP阵列天线进行了样机测试，测试结果表明，该天线在42.3 ~ 49 GHz频率范围内的S-11垂直方向图< -13 dB，AR < 2.5 dB，增益为8.2-10.5 dBic（14.72%），天线尺寸为30 mm × 30 mm × 1 mm。
This paper presents a Q-band planar circularly polarized (CP) antenna array with a wide bandwidth, in terms of both impedance matching and axial ratio (AR). A centered 45 degrees-inclined slot in the broad wall of a substrate-integrated waveguide (SIW) with a modified short-circuited termination is first introduced to realize a wideband 45 degrees linearly polarized radiation, incorporated with a pair of inductive vias for impedance matching. Then, orthogonally integrating two proposed slots with an SIW 90 degrees directional coupler, a wideband CP element is designed and its beam exhibits a good AR over a relatively wide angular region in one direction. Following this, a two-layer SIW is employed to design a CP antenna array. Four CP elements are arranged in a rotational manner in the top layer, and they are sequentially fed by a four-way power divider in the bottom layer with an incremental phase delay of 90 degrees to achieve a conical CP beam and higher gain. The performances of the power divider and cross-layer coupling slot are examined in the wide operating band. The proposed CP array antenna is prototyped at Q-band, and measured results show that the antenna has vertical bar S-11 vertical bar < -13 dB, AR < 2.5 dB, and a gain of 8.2-10.5 dBic over 42.3-49 GHz (14.72%) and has a dimension of 30 mm x 30 mm x 1 mm.