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.
標(biāo)簽： 射頻 基礎(chǔ)知識(shí)
上傳時(shí)間： 2013-10-23
上傳用戶(hù)：685
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.
標(biāo)簽： 無(wú)線(xiàn)技術(shù)
上傳時(shí)間： 2013-10-08
上傳用戶(hù)：kinochen
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.
標(biāo)簽： ASK_FSK 7060 MAX ISM
上傳時(shí)間： 2013-11-14
上傳用戶(hù)：swaylong
提出了一種基于PIC16F877A微控制器和CC2500射頻收發(fā)器芯片的低功耗、低成本RFID（Radio Frequency Identification， 無(wú)線(xiàn)射頻識(shí)別）局域定位系統(tǒng)設(shè)計(jì)方法，介紹了系統(tǒng)的定位工作原理、主要硬件電路模塊及定位算法的設(shè)計(jì)和實(shí)現(xiàn)。采用基于序列號(hào)對(duì)時(shí)隙數(shù)運(yùn)算的排序算法有效解決了多標(biāo)簽識(shí)別碰撞的問(wèn)題，基于射頻輻射強(qiáng)度（Received Signal Strength Indication， RSSI）和圓周定位算法實(shí)現(xiàn)了基于RFID多標(biāo)簽系統(tǒng)的平面定位。實(shí)驗(yàn)測(cè)試表明，這種射頻定位方法能夠?qū)崿F(xiàn)一定精度下的無(wú)線(xiàn)局域定位的功能。
上傳時(shí)間： 2013-11-06
上傳用戶(hù)：weareno2
Radio Frequency Identifi cation (RFID) technology usesradiated and refl ected RF power to identify and track avariety of objects. A typical RFID system consists of areader and a transponder (or tag). An RFID reader containsan RF transmitter, one or more antennas and an RFreceiver. An RFID tag is simply an uniquely identifi ed ICwith an antenna.
上傳時(shí)間： 2013-10-17
上傳用戶(hù)：lepoke
ZigBee™ 是專(zhuān)為低速率傳感器和控制網(wǎng)絡(luò)設(shè)計(jì)的無(wú)線(xiàn)網(wǎng)絡(luò)協(xié)議。有許多應(yīng)用可從ZigBee 協(xié)議受益，其中可能的一些應(yīng)用有：建筑自動(dòng)化網(wǎng)絡(luò)、住宅安防系統(tǒng)、工業(yè)控制網(wǎng)絡(luò)、遠(yuǎn)程抄表以及PC 外設(shè)。此程序包提供的是Zigbee協(xié)義棧函數(shù)庫(kù)源代碼，它實(shí)現(xiàn)了一個(gè)與物理層 無(wú)關(guān)的應(yīng)用程序接口。 因此，無(wú)需做重大修改就可以輕松地在射頻（Radio Frequency，RF）收發(fā)器之間移植應(yīng)用程序。
標(biāo)簽： ZigBee 8482 協(xié)議 低速
上傳時(shí)間： 2014-01-16
上傳用戶(hù)：Pzj
This manual describes Freescale’s IEEE™ 802.15.4 Standard compliant MAC/PHY software. The Freescale 802.15.4 MAC/PHY software is designed for use with the Freescale MC1319x and MC1320x, family of short range, low power, 2.4 GHz Industrial, Scientific, and Medical (ISM) band transceivers, designed for use with the HCS08 Family of MCUs. The MAC/PHY software also works with the MC1321x family of short range, low power, 2.4 GHz ISM band transceivers that incorporate a low power 2.4 GHz radio frequency transceiver and an 8-bit microcontroller into a single LGA package. Throughout this manual, the term transceiver refers to either the MC1319x, MC1320x, or the internal counterpart inside the MC1321x System in a Package (SiP).
標(biāo)簽： Freescale describes compliant Standard
上傳時(shí)間： 2016-04-17
上傳用戶(hù)：caiiicc
RFID, the wireless technology that has helped millions of people around the world to protect their property and make their workplaces safer is now in danger of being viewed as a security risk. Ray Stanton examines the love-hate relationship between people and Radio Frequency Identification [RFID] tags and highlights the need for informed debate about the privacy issues the technology raises.
標(biāo)簽： technology the millions wireless
上傳時(shí)間： 2017-03-19
上傳用戶(hù)：cmc_68289287
Traditional modulation methods adopted by space agencies for transmit- ting telecommand and telemetry data have incorporated subcarriers as a sim- ple means of separating different data types as well ensuring no overlap between the radio frequency (RF) carrier and the modulated data’s frequency spectra.
標(biāo)簽： Bandwidth-Efficient Modulation Digital
上傳時(shí)間： 2020-05-26
上傳用戶(hù)：shancjb
The design and manufacturing of wireless radio frequency (RF) transceivers has developed rapidly in recent ten yeas due to rapid development of RF integrated circuits and the evolution of high-speed digital signal processors (DSP). Such high speed signal processors, in conjunction with the development of high resolution analog to digital converters and digital to analog converters, has made it possible for RF designers to digitize higher intermediate frequencies, thus reducing the RF section and enhancing the overall performance of the RF section.
標(biāo)簽： Transceivers Wireless Digital
上傳時(shí)間： 2020-05-27
上傳用戶(hù)：shancjb
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