A low-profile switched-beam dual-band capacitively coupled Square Loop Antenna
A low-profile switched-beam dual-band capacitively coupled Square Loop Antenna
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薄型开关波束双频电容耦合方环天线
DOI：
10.1109/lapc.2013.6711963
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
H. Nakano
中科院分区：
文献类型：
--
作者：
A. Pal;A. Mehta;D. Mirshekar;H. Nakano
提出了一种适用于开关波控的双频电容耦合馈电正方形环天线。两个同心正方形环路由四个矩形馈电贴片电容耦合。电容耦合馈电机构在天线输入阻抗中引入电容，消除了由于靠近地平面而产生的高电感，有助于实现低轮廓的SLA。天线的高度为3 mm，即工作频率为4.1千兆赫时的λ为0/24。该天线设计工作在4.1 GHz和5.2 GHz频段，阻抗带宽分别为130 MHz和160 MHz。在两个频段中，当四个端口中的任何一个被激励时，保持其他端口的开放电路，天线产生从侧面倾斜(约37°)的辐射波束，并指向远离激励端口的方向。在这两个工作频率下，天线在最大辐射方向上的方向性为9.2 dBI。因此，通过一次激励一个端口，天线可以将其倾斜的波束转向四个不同的象限，以扫描天线前面的整个空间。
A dual band Square Loop Antenna (SLA) with capacitively coupled feeds is presented for switched beam steering application. Two concentric square loops are capacitively coupled by four rectangular feeding patches. The capacitively coupled feeding mechanism introduces capacitance into the antenna input impedance and cancels the high inductance due to close proximity of the ground plane and helps in the realization of a low profile SLA. The antenna has a height of 3 mm; i.e. λ0/24 for the operating frequency of 4.1 GHz. The Antenna is designed for operating in 4.1 GHz and 5.2 GHz frequency bands and exhibits an impedance bandwidth of 130 MHz and 160 MHz, respectively. In both frequency bands when any of the four ports is excited, keeping other ports open circuited, the antenna generates a radiation beam tilted (approximately 37°) from the broadside and directed away from the excited port. The antenna has the directivity of 9.2 dBi in the direction of maximum radiation at both the operating frequency. Thus by exciting one port at a time, the antenna can steer its tilted beam in four different quadrants to scan the entire space in front of the antenna.