Azimuth Angle Estimation for a Reduced Radiation Region Formed by a Metaspiral Antenna
Azimuth Angle Estimation for a Reduced Radiation Region Formed by a Metaspiral Antenna
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DOI：
10.1109/access.2019.2921452
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
H. Nakano;T. Abe;T. Kawano;A. Mehta;J. Yamauchi
中科院分区：
文献类型：
--
作者：
H. Nakano;T. Abe;T. Kawano;A. Mehta;J. Yamauchi
提出了一种双臂亚螺旋天线，其馈电电压源用激励幅值r和偏转角δ来表示。该激励被分解为奇模分量和偶模分量。奇模分量形成圆极化（CP）轴向波束，偶模分量形成CP锥形波束，其最大强度偏离天线轴。将锥形射束叠加到轴向射束上在仰角平面中形成减小的辐射区域。减小的辐射区域用于最小化特定$\phi _{\marthm {FBD}}$方向上的传输或抑制来自$\phi _{\marthm {FBD}}$方向的干扰信号。本文提出了一个估算辐射缩减区方位角的公式。该公式的特征是激励模式比${m}$和模式相位差$\Delta \Phi $。通过与通过在3D辐射图案上搜索零而获得的模拟方位角显示良好的一致性来验证所制定的方位角。该公式很简单，因此取代了耗时的3D空搜索。
A two-arm metaspiral antenna is presented, where the feeding voltage sources are expressed using excitation amplitude $r$ and deviation angle $\delta $ . This excitation is decomposed into the odd mode and even mode components. The odd mode component forms a circularly polarized (CP) axial beam and the even mode component forms a CP conical beam, whose maximum intensity is off the antenna axis. Superimposing the conical beam onto the axial beam forms a reduced radiation region in the elevation plane. The reduced radiation region is used for minimizing transmission in a particular $\phi _{\mathrm {FBD}}$ direction or the rejection of interference signals from the $\phi _{\mathrm {FBD}}$ direction. This paper presents a formula that estimates the azimuth angle of the reduced radiation region. The formula features the excitation mode ratio, ${m}$ , and the mode phase difference, $\Delta \Phi $ . The formulated azimuth angle is validated by showing good agreement with the simulated azimuth angle obtained by searching for a null over the 3D radiation pattern. The formula is simple and hence supersedes the time-consuming 3D null search.