描述
在通讯技术领域,与其它考量功率、电平等参数的量值同样,天线增益也采用相对比较并取对数的简化法来表示,具体计算方法为:在某一方向向某一位置产生相同辐射场强的时,对无损耗理想基准天线的输入功率与待考量天线的输入功率的比值取对数后乘以10(G=10lg(基准Pin/考量Pin)),即称为该天线在该点方向的增益。常用衡量天线增益的单位是dBi和dBd。对于dBi,其基准为理想的点源天线,即一个真正意义上的“点”来作天线增益的对比基准。理想点源天线的辐射是全向的,其方向图是个理想的球,同一球面上所有点的电磁波辐射强度均相同;对于dBd,其基准则为理想的偶极子天线。因偶极子天线是带有方向性的,故二者有个固定的恒差2.15即0dBd=”2″.15dBi。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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