设计了一种用于用户端设备 (CPE) 且工作在2G/3G/4G/IMT/5G频段的小型化超宽带交叉振子天线. 单个交叉振子的双臂由阶梯型枝节组成, 天线的带宽不但能够通过选择阶梯型枝节的阶数来控制, 还可以通过延伸枝节末端来展宽. 偶极子通过连接在同轴线上的微带枝节来馈电. 此外, 通过在交叉振子下方增加开缝的寄生贴片, 天线整体的带宽能够扩展到5G sub-6 GHz频段. 此外, 对天线结构进行了加工和测试. 结果表明天线的10 dB相对带宽为147.3 % (0.77–5.07 GHz), 双端口之间的隔离度优于20 dB.

Microbubble-induced acoustic microstreaming for efficient on-chip micromanipulation is widely developed in biological applications. However, it is still challenging to simultaneously transport, trap, and rotate single cells using one device in a biocompatible manner, while expensive and bulky traditional acoustic driving system also increases its limitation. This paper presents a portable acoustofluidic device for multifunctional cell manipulation and 3D reconstruction, using acoustically oscillating bottom bubble array. Based on the Arduino-based driving system, multiple bubble-induced microvortices were generated and utilized to achieve multifunctional manipulation in a noninvasive manner. Self-propelled transportation of single or multiple cells is first accomplished by bottom bubble array; Controllable trapping, 3D rotation (in the x-y or x-z plane) of DU145 cells are further performed by every single microbubble. Through experiments, rotation direction, speed and axis can be modulated by tuning the driving frequency and voltage. Finally, 3D cell reconstruction combining imaging processing algorithm with out-of-plane rotation enables a sufficient illustration of cell structures and surface morphology, providing an efficient properties measurement function. All these aspects of this device show great potentials in bioengineering, biophysics and biomedicine.