一种用于LoRa可穿戴设备的小型化双频段天线  

Miniaturized dual band antenna for LoRa wearable devices

作　　者：禹忠 晁美静 秦婷[1] 张高记[1] 沈曜旭 YU Zhong;CHAO Meijing;QIN Ting;ZHANG Gaoji;SHEN Yaoxu(Xi'an University of Posts and Telecommunications,Xi'an 710121,China)

机构地区：[1]西安邮电大学

出　　处：《电波科学学报》2019年第5期582-589,共8页Chinese Journal of Radio Science

基　　金：5G终端的大规模MIMO天线系统开发与验证(2018ZDCXL-GY-04-01)

摘　　要：提出了一种适用于LoRa可穿戴设备的小型化双频段天线.该天线由半径为18 mm的基板及上方高6 mm的圆环支架构成,利用顺时环绕单极子、耦合分支在一定小型化的结构上激励出两个低频谐振模式,满足LoRa天线性能要求.实测天线-10 dB阻抗带宽为476~502 MHz和854~879 MHz,能够覆盖LoRa设备在470~510 MHz和863~868 MHz的大部分工作频段,同时在490 MHz和865 MHz两个工作频率点测得效率分别为15.56%和27.91%.该天线结构简单,覆盖频率广,体积小,工作频带内具有良好的辐射性能,具有一定的工程应用价值.A miniaturized dual-band antenna suitable for LoRa wearable devices is proposed. The antenna is composed of a substrate with a radius of 18 mm and above the 6 mm high ring bracket. A clockwise surround monopole and coupling branches are adopted to generate two low-frequency resonant modes on a certain miniaturized structure, which can meet the LoRa antenna performance requirements. The antenna achieves -10 dB impedance bandwidth of 476-502 MHz and 854-879 MHz, and can cover most of the working frequency bands of LoRa devices at 470-510 MHz and 863-868 MHz. The measured efficiency at the two operating frequency points of 490 MHz and 865 MHz is 15.56% and 27.91% respectively. The antenna has a simple structure, a wide coverage frequency, a small volume, and a good radiation performance in the working frequency bands, and has a certain engineering application value.

关 键 词：LoRa可穿戴设备 双频段天线 小型化 阻抗带宽 

分 类 号：TN828[电子电信—信息与通信工程]