摘要
为了提高耦合谐振电路中负载端的工作距离,使其达到30 cm以上,并且能从负载端传输数据回发射端,基于频率分裂原理,设计了带负载匹配的能量与数据传输电路。对串联电路研究可知,满足一定传输功率的最大传输距离和负载阻值相关。而带负载匹配的串并混联电路在小幅降低传输功率的情况下可以通过调整等效负载电阻大小来增加传输距离。基于反向散射原理和混联电路的负载特性,可以在均衡传输效率和传输距离的情况下,选取合理的负载调制电路,实现数据从负载端到发射端的传输。matlab仿真验证了以上结论,而系统实测表明,相比于串联电路,串并混联在保证数据正确传输的前提下,极限工作距离达到38 cm,提升20%以上。
To increase the working distance （more than 30 cm） of receiver of resonant coupling circuitand get correct data from receiver, a power and data transmitting circuit with capacity matching isdesigned based on frequency splitting theory. Research on series circuit shows that maximum transmittingdistance with required power is related to load impedance. And SP-mixed matching （Series-Parallel-mixed）circuit can modify equivalent load impedance to increase working distance while decreasing sometransmitting power. To transmit data from receiver to transmitter, suitable modulation load should beselected to tradeoff transmitting power and distance based on backscatter theory and load properties ofSP-mixed circuit. Conclusions are verified by matlab simulation. And results of real system testing showthat maximum working distance of SP-mixed circuit increases to 38 cm, up 20% compared to series circuitwhile ensuring data is transmitted correctly.
出处
《太赫兹科学与电子信息学报》
2014年第6期852-857,共6页
Journal of Terahertz Science and Electronic Information Technology
关键词
耦合谐振
频率分裂
匹配电路
负载调制
无线无源传感器
resonant coupling
frequency splitting
matching circuit
load modulation
wireless andpassive sensor
