huxyc的博客

APT正在研究470-698MHz, 1427-1518MHz, 3300-3400MHz、4800-4990MHz和大于24GHz频段，这些频段也列入了WRC-15的列表中（估计4800-4990MHz频段会更新）。目前，全球最有可能优先部署的5G频段为n77、n78、n79、n257、n258和n260，就是3.3GHz-4.2GHz、 4.4GHz-5.0GHz和毫米波频段26GHz/28GHz/39GHz。另外，中、韩、日作为5G的先行者，已在3GHz和5GHz频段上展开5G测试。

ZigBee 技术在 IEEE 802.15.4 的推动下，不仅在工业、农业、军事、环境、医疗等传统领域取得了成功的应用，在未来其应用可能涉及人类日常生活和社会生产活动的所有领域，真正实现无处不在的网络。

目前已有不少企业选择通过OTA（Over The Air）测试（以下简称：OTA测试）随着无线通信终端、智能汽车及零部件、智能家居等产品的应用场景不断扩展，然而在5G背景下，通信频段，智能产品类别和应用场景较以往大幅增加，看电视时，智能电视机会突然出现“网络视频加载中”的情况；用手机远程控制智能家居产品时，手机显示操控失败；可是，不少产品在使用过程中会出现通信问题。在通话时，手机会突然出现通信中断；，用以验证产品天线系统辐射性能。来验证智能产品的整机性能。大大增加了测试的难度，为避免出现以上问题，

SS-MPAC (Simplified Sectorized MultiProbe Anechoic Chamber) The concept of SS MPAC is to use multiple probes around UE as illulstrated below to emulate more realistic radio channel condition. < R4-1706669 : Figure 2. Installed probes in the sector and UE

Reference。

As mentioned above, it is likely for only blackbox approach to be accepted as a test method for commercialized device since UE manufacturer does not like to disclose the detailed antenna information, but blackbox approach tend to require huge chamber (i.e,

WhiteboxBlackboxNOTE。

D(cm)Freq(Ghz)Path Loss128227.42228738.303281746.014283050.945284754.846286757.927289160.5882811962.9192815164.98102818766.83112822668.48122826969.99132831571.36142836672.67152842073.86。

Probably by now, you may have a question 'Why do we need to test in Far Field ?'. It would not be easy to get a direct answer to this question. So let me change the question a little bit. Why we do not test in Near field ?The simple answer to this questio

D(cm)Freq(Ghz)Near/FarPath Loss528474855102818718866.9152842042073.8202874774878.925281167116882.730281680168085.9510016716876.91010066766888.915100150015009620100266726681012510041674168。

(A)(B)

(A)(B)(C)(D)

Conductive。