A Multibeam Ambient Electromagnetic Energy Harvester With Full Azimuthal Coverage
A Multibeam Ambient Electromagnetic Energy Harvester With Full Azimuthal Coverage
复制标题
全方位覆盖的多波束环境电磁能量采集器
DOI：
10.1109/jiot.2021.3119417
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发表时间：
2022
影响因子：
10.6
通讯作者：
S. Zheng
中科院分区：
文献类型：
--
作者：
Wenhui Deng;S. Wang;Boru Yang;S. Zheng
面对物联网中众多低功耗设备的电池更换或充电挑战，环境电磁（EM）能量的收集被认为是一种有前途的方法。由于电磁能量在环境中随机分布，全向天线或多波束天线是更好的选择，因为它们的大覆盖范围使它们能够收集尽可能多的能量。然而，全向天线通常具有较低的增益，导致较低的接收能量，并且大多数具有高增益的多波束天线需要复杂的馈电网络。为了解决这些问题，本文提出了一种无需复杂馈电网络的六波束天线。它由三角形贴片阵列层和表面波导层组成。该天线的峰值增益为8.3 dBi，H面和E面的3 dB波束宽度分别为62和56 dB，在一定的仰角范围内实现了全方位覆盖。为了演示，一个EM能量采集器构建的基础上提出的天线。可以观察到，所实现的设备可以在不同的水平取向上收获几乎相同量的EM能量，并且在多个EM发射器的情况下获取多倍DC功率。
Confronting the challenge of replacing or recharging batteries for numerous low-power devices in the Internet of Things, the harvesting of ambient electromagnetic (EM) energy is considered a promising approach. Since EM energy is randomly distributed in the environment, omnidirectional antennas or multibeam antennas are better choices for their large coverages which enable them to collect as much energy as possible. However, omnidirectional antennas usually have low gains resulting in low receiving energy, and most multibeam antennas with high gains require complicated feeding networks. To address these issues, a six-beam antenna without a complex feeding network is proposed in this article. It consists of a triangular patch array layer and a surface waveguide layer. A peak gain of 8.3 dBi, as well as a 3-dB beamwidth of $62\mathbf {\mathrm {^\circ }}$ in H-plane and $56\mathbf {\mathrm {^\circ }}$ in E-plane have been achieved, affording full azimuthal coverage within a certain elevation angle range. For demonstration, an EM energy harvester is constructed based on the proposed antenna. It can be observed that the implemented device can harvest almost the same amount of EM energy in different horizontal orientations, and acquire multifold DC power in the case of multiple EM transmitters.