一种双频段LoRa紧凑型可穿戴开槽平面天线
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摘要
设计了一种用于LoRa可穿戴设备的470 MHz和868 MHz紧凑型双频段开槽平面天线。天线辐射线由一个单极子加寄生分支组成,辐射线绕制在开槽参考地的边缘,从馈电口引出的最长单极天线能实现470～510 MHz低频段,寄生分支能实现863～868 MHz较高频段。在天线接地部分刻蚀出的环状槽能延长地电流的长度,降低天线Q值,有效拓展天线的带宽。辐射线和地布置在半径小于20 mm的圆形基板上,满足LoRa可穿戴设备多频带、微型化的要求。仿真和实测结果表明,该天线的回波损耗在两个频段范围均小于-10 dB,驻波比≤2,效率≥24.94%,各方向的辐射性能良好,远场测试增益大于-1.5 dBi。
A 470 MHz and 868 MHz compact dual-band slotted planar antenna for LoRa wearable devices was designed. The antenna radiation line was composed of a monopole and a parasitic branch, and the radiation line was wrapped around the edge of the slotted reference ground. The low frequency band 470 ～ 510 MHz was realized by the longest monopole antenna derived from the feed port, while the higher frequency band 863 ～ 868 MHz was implemented by the parasitic branch. The length of the ground current was extended by the annular groove etched on the ground portion, which reduced the Q value of the antenna and extended effectively the bandwidth of the line. The radiation line and ground was laid on a circular substrate, whose radius was only 20 mm, which satisfied the requirements of multi-band and miniaturization of the antenna design for LoRa wearable devices. Simulation and field measurement results showed that the echo loss of the antenna was less than-10 dB in both frequency bands, the VSWR≤2, the efficiency ≥24.94%, the radiation performance in all directions was good, and the far-field test gain was greater than-1.5 dBi.
A 470 MHz and 868 MHz compact dual-band slotted planar antenna for LoRa wearable devices was designed. The antenna radiation line was composed of a monopole and a parasitic branch, and the radiation line was wrapped around the edge of the slotted reference ground. The low frequency band 470 ～ 510 MHz was realized by the longest monopole antenna derived from the feed port, while the higher frequency band 863 ～ 868 MHz was implemented by the parasitic branch. The length of the ground current was extended by the annular groove etched on the ground portion, which reduced the Q value of the antenna and extended effectively the bandwidth of the line. The radiation line and ground was laid on a circular substrate, whose radius was only 20 mm, which satisfied the requirements of multi-band and miniaturization of the antenna design for LoRa wearable devices. Simulation and field measurement results showed that the echo loss of the antenna was less than-10 dB in both frequency bands, the VSWR≤2, the efficiency ≥24.94%, the radiation performance in all directions was good, and the far-field test gain was greater than-1.5 dBi.
引文
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[2] TRINH L H,NGUYEN T Q K.,TRAN H L,et al.Low-profile horizontal omni-directional antenna for LoRa wearable devices [C] // Int Conf ATC.Quy Nhon,Vietnam.2017:136-139.
[3] JIANG Z H,BROCKER D E,SIEBER P E,et al.Low-profile metasurface-enabled antenna for wearable medical body-area network devices [J].IEEE Trans Anten & Propag,2014,62(8):4021-4030.
[4] BARONI A,ROGIER H,NEPA P.Wearable active Sierpinski fractal antenna for off-body communication [C] // IEEE APWC.Turin,Italy.2015:642-645.
[5] XU K W,LIU Y,DONG L X,et al.Printed multi-band compound meta-loop antenna with hybrid-coupled SRRs [J].IET Microwaves,Anten & Propag,2018,12(8):1382-1388.
[6] MOHAMED-HICHO N M,ANTONINO-DAVIU E,CABEDO-FABRES M,et al.Designing slot antennas in finite platforms using characteristic modes [J].IEEE Access,2018,6:41346-41355.
[7] 花鹏成,张帅,龚书喜.开槽宽带圆极化交叉偶极子天线 [J].微波学报,2016,32(S1):143-146.
[8] PENG B,LI S F,ZHANG Q Y,et al.CPW-fed dual-/tri-band slot antenna based on multi-mode slot line resonator [C] // IEEE Int Symp Anten & Propag.Fajardo,Puerto Rico.2016:205-206.
[9] 蒋迪.宽频带天线小型化技术研究 [D].成都:电子科技大学,2009:66-71.
[10] KIBRET B,TESHOME A K,LAI D T H.Analysis of the human body as an antenna for wireless implant communication [J].IEEE Trans Anten & Propag,2016,64(4):1466-1476.
[11] 谢鹏,王光明,李海鹏.加载谐振环的新型宽带准八木天线设计 [J].微波学报,2017,33(2):17-21.
[12] 严冬,王鹏飞,李帅永,等.一种433 MHz小型化螺旋形印刷天线的设计 [J].电子技术应用,2017,43(2):92-94.