Design on the flexible meander-line LoRa antenna for smart slippers

• Main Authors: Yen-Tze Peng, 彭彥詞
• Other Authors: Yao-Chiang Kan
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/ffcrg9

碩士 === 元智大學 === 通訊工程學系 === 106 === With mature the Internet of Things (IoT) technology, most wearable devices can be connected to the Internet, commute with back-end hosts which providing emerging artificial intelligence services, and transform to the smart devices. In this thesis, the flexible dipole antennas working in the LoRa frequency band (902MHz~928MHz) and attached on one side of a slipper is designed. It is assumed that an integrated circuit board consisting of the six-axis IMU, GPS, ARM microcontroller and LoRa chip is placed inside the shoe body. Limited by the space on the side of a shoe, the flexible printed dipole antenna is chosen to be the candidate. First, two flexible printed dipole antennas with center frequencies of 920MHz and 1075.5MHz are manufactured, respectively. The slipper and ground effects on the impedance bandwidth are measured followed by the measurements of the human foot effects on the bandwidth while walking scenario in actual application. Finally, the second antenna is employed in outdoor power measurement. Meanwhile, the commercial module is used with this proposed LoRa antennas and fixed on the surface of a shoe. Then a person wears this smart shoe prototype and walks around the YZU campus. The received signal strength (RSS) and locations received by the LoRa gateway is then recorded by an Android App on mobile phone. The result show that the designed printed flexible dipole antenna is able to used in the LoRa-based smart shoes application.