One- and two-dimensional antenna arrays for microwave wireless power transfer (MWPT) systems

In this work, we demonstrate novel one- and two-dimensional antenna arrays for microwave wireless power transfer (MWPT) systems. The antenna array can be used as the MWPT receiving antenna of an integrated MWPT and Bluetooth (BLE) communication module (MWPT-BLE module) for smart CNC (computer numerical control) spindle incorporated with the cloud computing system SkyMars. The two-dimensional antenna array has n rows of 1×m one-dimensional array, in which each one-dimensional array is composed of multiple (m) differential feeding antenna units. Each differential feeding antenna unit has a microstrip antenna stripe. The stripe length is shorter than one wavelength to reduce the antenna area and to avoid being excited to a high-order mode. An inclination angle of the main beam aligns with the broadside, and the main beam is further concentrated and shrunk at the elevation direction. At the operation frequency of 9.9 GHz, the measured maximal E-plane gain is 9.9 dB. In addition, the measured maximal H-plane gain and beam width are 9.66 dB and 27.5°, respectively. The excellent performance of the antenna arrays indicates that they are suitable for MWPT systems.