物联网感知线圈电感量设计与阻抗匹配

Inductance Value Design and Impedance Matching for Sensing Coil of Internet of Things

阐述了13.56 MHz工作频率线圈的电感、电容满足一定条件下实现电磁振荡的原理,设计了线圈的电感量,提出了并联谐振电路电容、电阻混合阻抗匹配的计算公式。通过计算,矩形PCB微带线线圈和矩形空心线圈电感值分别约1μH和2μH。根据线圈电感量,理论计算与Smith圆图仿真相结合确定电容、电阻混合阻抗匹配参数值。匹配电路简单,经单个参数和系统测试,测量值与理论值相符,且线圈能正常使用。该设计成果可广泛应用于13.56 MHz的RFID等物联网系统中。

The paper explained the electromagnetic oscillation principle when inductance and capacitance met a specific condition at 13.56 MHz carrier frequency, designed inductance value of coil, and set forth capacitance value computing formula on parallel res- onance oscillation with mixed impedance matching. The computing on PCB rectangle mierostrip coil and rectangle hollow coil re- spectively showed 1 μH and 2 μH inductance value. According to inductance value of coil, capacitance and resistance value with mixed impedance matching were attained by theory computing and Smith chart simulation. The test value of individual and system parameter is consistent with the theoretical that as well as the simple circuit normally operates. These research outcomes can be ap- plied to extensively Internet of Things system on RF ID of 13.56 MHz carrier frequency.