面向3C融合的无线抄表系统设计

为了快速有效地实现数字家庭的3C融合,本文提出了一种基于433MHz无线通信技术的无线抄表系统设计方案.该方案中抄表终端和集中器基站采用无线传输芯片CC1020实现有限空间范围的数据传输;同时,本文设计了433MHz通信防碰撞技术实现抄表终端和集中器基站之间的无线组网。试验结果表明,在常见的建筑物包括结构复杂、障碍物较多的小区居民楼内,抄表终端与集中器基站之间数据传输在200m左右时成功率可达90%以上,在比较空旷的空间内传输的效果会更好,本项技术具有良好的推广价值。     

Correlating the microstructure with magnetic properties of Ti-doped high-frequency MnZn ferrite

In this study, high-frequency MnZn ferrites are prepared for power applications at 10 MHz using solid-state reaction method. The sample doped with 3000 ppm TiO₂ yields the optimal comprehensive magnetic properties, with an initial permeability of 792, power loss of 415 kW/m³ (10 MHz, 5 mT, 25 ℃), and saturation induction of 460 mT. This indicates significant progress compared to previously reported results. The mechanisms of property optimisation, microstructure and domain structure evolution also discussed with TiO₂ doping. The precipitation of Ti at the grain boundary can promote a high-density microstructure and favour the formation of magnetic monodomain in MnZn ferrites. Our results elucidate the correlations between microstructure, domain structure, and high-frequency performance, and present a potential roadmap for the development of high-frequency soft magnetic ferrites.