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<div class="tt">Introduction of RF</div>
<div class="txt2 txtimg"><p><span style="color: rgb(255, 0, 0);"><strong>RF (Radio Frequency)</strong></span></p><p>RF refers to the technology of transmitting information and energy by using electromagnetic wave with certain wavelength which can be used in radio communication. Its frequency range is from 3 kHz to 300 GHz.</p><p><br/></p><p><span style="color: rgb(255, 0, 0);"><strong>Three Elements of RF Composition</strong></span></p><p>Wireless chip, crystal oscillator and antenna are indispensable.</p><p><img src="/upload_files/2019-05/1558660232589793.png" title="1558660232589793.png" alt="图片1.png"/></p><p><br/></p><p><strong><span style="color: rgb(255, 0, 0);">RF Test Method</span></strong></p><p><strong><span style="color: rgb(255, 0, 0);"><br/></span></strong></p><p><strong>Conducted (Cond)</strong></p><p>　　The circuit between the wireless chip and the antenna is changed so that the radio signal is connected to the direct measurement of the test system by the radio frequency cable.</p><p><br/></p><p><strong>Radiated (Rad)</strong></p><p>　　Without changing the circuit between the wireless chip and the antenna, the radio signal can be received and transmitted of the space measurement by the antenna.</p><p><br/></p><p><br/></p><p><br/></p><p><span style="color: rgb(255, 0, 0);"><strong>Common RF Certification Item</strong></span></p><p>·Output Power</p><p>·Power Spectral Density</p><p>·Occupied Channel Bandwidth</p><p>·Adaptivity</p><p>·Blocking</p><p>·Dynamic Frequency Selection (DFS)</p><p>·Frequency Stability</p><p>·Duty Cycle</p><p>·Transmitter Spurious Emissions</p><p>·Receiver Spurious Emissions</p><p><br/></p><p><strong><span style="color: rgb(255, 0, 0);">Scope of BTL service</span></strong></p><p>·IEEE 802.11a/b/g/n/ac/ax WLAN Devices</p><p>·Bluetooth Devices</p><p>·Short Range Devices (SRD)</p><p>·RFID Devices (Radio Frequency Identifications)</p><p>·Wireless Power Transmission Devices (WPT)</p><p><br/></p></div>
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