Aboualalaa Mohamed, Mohamed Hesham A, Alghamdi Thamer A H, Alathbah Moath
Microstrip Department, Electronics Research Institute, Cairo 11843, Egypt.
Wolfson Centre for Magnetics, School of Engineering, Cardiff University, Cardiff CF24 3AA, UK.
Sensors (Basel). 2023 Oct 13;23(20):8451. doi: 10.3390/s23208451.
A pattern reconfigurable antenna, composed of eight elements, is proposed for energy harvesting applications. Pattern reconfigurable antennas are a promising technique for harvesting from different wireless sources. The radiation pattern of the proposed antenna can be steered electronically using an RF switch matrix, covering an angle range from 0 to 360 degrees with a step size of 45 degrees. The proposed antenna primarily consists of an eight-dipole configuration that shares the same excitation. Each dipole is excited using a balun comprising a quarter-wavelength grounded stub and a quarter-wavelength open-circuit stub. The proposed antenna operates in the frequency range of 4.17 to 4.5 GHz, with an impedance bandwidth of 7.6%. By switching between the different switches, the antenna can be steered with a narrower rotational angle. In addition, the antenna can work in an omnidirectional mode when all switches are in the ON state simultaneously. The results demonstrate a good agreement between the numerical and experimental findings for the reflection coefficient and radiation characteristics of the proposed reconfigurable antenna.
本文提出了一种由八个单元组成的方向图可重构天线，用于能量收集应用。方向图可重构天线是一种从不同无线源进行能量收集的有前景的技术。所提天线的辐射方向图可通过射频开关矩阵进行电子控制，覆盖角度范围为0至360度，步长为45度。所提天线主要由具有相同激励的八偶极配置组成。每个偶极通过一个由四分之一波长接地短截线和四分之一波长开路短截线组成的巴伦进行激励。所提天线工作在4.17至4.5 GHz的频率范围内，阻抗带宽为7.6%。通过在不同开关之间切换，天线可以以更窄的旋转角度进行控制。此外，当天线所有开关同时处于导通状态时，天线可以工作在全向模式。结果表明，所提可重构天线的反射系数和辐射特性的数值结果与实验结果吻合良好。
