RFID（Radio Frequency Identification）技术是利用射频通信实现的一种非接触式自动识别技术。拥有广阔的发展前景和巨大的市场潜力。本文介绍了RFID技术的原理、特点，深入分析了信号传输时所采取的反方向散射的调制方式，影响传输距离的因素，最后介绍了在远程RFID自动识别系统中的读写冲突和防冲突算法，更好的解决了远程RFID系统存在的冲突问题。
上传时间： 2013-10-11
上传用户：fdfadfs
根据一些环境温度湿度实时监测的需要，采用首个符合Zigbee标准的CC2430射频芯片，以SHT10为温湿度传感器来设计实现温度湿度的数据采集与传输。利用TI公司的Z-Stack协议栈在IAR开发环境下，建立一个无线传感器网络。网络协调器通过RS232串口与PC通信，实现对温度湿度的无线智能监测
上传时间： 2013-11-05
上传用户：liaofamous
射频
上传时间： 2014-12-07
上传用户：chenbhdt
Abstract: This application note describes system-level characterization and modeling techniques for radio frequency (RF) and microwavesubsystem components. It illustrates their use in a mixed-signal, mixed-mode system-level simulation. The simulation uses an RF transmitterwith digital predistortion (DPD) as an example system. Details of this complex system and performance data are presented.
上传时间： 2013-12-18
上传用户：onewq
为了实现对矿山生产过程中三维定位和灾害预警监测，设计了一种基于RFID和无线传感的矿山实时定位预警系统，硬件包括无线射频标识模块、实时三维定位模块、监测数据采集与分析模块、灾害预警模块、灾害分析模块和地面远程控制主机。实际应用表明，该系统平台铺设灵活性强，监控范围广泛，可以三维全方位监控，有效提高矿山安全监测效率。
上传时间： 2013-11-23
上传用户：363186
采用RFID（射频识别）芯片IA4420设计了一款主动式应答器，主要应用于矿井安全生产管理。其工作中心频率为905 MHz，数据通信的核心部分是印刷偶极子天线，从仿真结果来看：其相对带宽约为40%，增益约为4.236 dB，输入阻抗接近纯电阻 50 Ω，性能参数较好。
上传时间： 2013-11-12
上传用户：caiguoqing
给出一种实时互锁式无线抢答手柄的设计应用实例，使无线抢答器的死区时间由通常的40 ms锐减为40 μs。其基本思路是：在每只抢答手柄中增加一片射频接收模块和一个电子开关、配以相应的附属电路，使该电子开关受控于接收模块输出信号的有无，并决定手柄中的射频发射模块是否通电工作，从而实现各抢答手柄之间的实时互锁。只有首先被按下抢答按键的手柄，才有可能向外发送编码射频。持有该手柄的选手即为抢答成功者。
上传时间： 2013-11-10
上传用户：JGR2013
Radio frequency (RF) can be a complex subject to navigate, but it does not have to be. If you are just getting started with radios or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well act as a quick reference for those who “know their stuff” but may be looking to brush up on that one niche term that they never quite understood. This document is also a useful reference for Maxim’s products and data sheets, an index to deeper analysis found in our application notes, and a general reference for all things RF.
上传时间： 2013-10-23
上传用户：685
Abstract: This application note illustrates the flexibility of the MAX7060 ASK/FSK transmitter. While the currently available evaluationkit (EV kit) has been optimized for the device's use in a specific frequency band (i.e., 288MHz to 390MHz), this document addresseshow the EV kit circuitry can be modified for improved operation at 433.92MHz, a frequency commonly used in Europe. Twoalternative match and filter configurations are presented: one for optimizing drain efficiency, the other for achieving higher transmitpower. Features and capabilities of earlier Maxim industrial, scientific, and medical radio-frequency (ISM-RF) transmitters areprovided, allowing comparison of the MAX7060 to its predecessors. Several design guidelines and cautions for using the MAX7060are discussed.
上传时间： 2013-11-14
上传用户：swaylong
提出了一种基于PIC16F877A微控制器和CC2500射频收发器芯片的低功耗、低成本RFID（Radio Frequency Identification， 无线射频识别）局域定位系统设计方法，介绍了系统的定位工作原理、主要硬件电路模块及定位算法的设计和实现。采用基于序列号对时隙数运算的排序算法有效解决了多标签识别碰撞的问题，基于射频辐射强度（Received Signal Strength Indication， RSSI）和圆周定位算法实现了基于RFID多标签系统的平面定位。实验测试表明，这种射频定位方法能够实现一定精度下的无线局域定位的功能。
上传时间： 2013-11-06
上传用户：weareno2
