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电磁波实践上来说,传输距离基本上是和天线增益,解调阈值和发送能量有关。 卫星用GHz来通信,说明距离和频率关系不是很大,原因是卫星的发送功率和天线增益都比较高。 Wifi的2.4GHz和5GHz指的是频率,其中的区别就是频率的不同,因为波长和频率是成反比的,所以2.4GHz的波长比较长,5GHz的波长比较短。 第三、 信道带宽 一个信道中最大频率与最小频率的差,就叫做信道带宽,这个值体现了信道覆盖的频率范围的大小。 f=1800MHz,波长越短,直射能力越强,贯穿能力越强,信号损失衰减越大,传输距离越短,杀伤力越强,实现信号局域覆盖。
频率越高波长越短,传输距离越短是什么原因?--衍射和穿透障碍物 1.无线电波,为什么频率越高,传输距离越短? A.距离远近是相对的,你提出的问题只是狭义上的,不是真理。 你说的结论是在存在障碍物 (物体尺寸与波形相当的障碍物)解释如下: 频率越高波长越短,绕射(衍射效果)能力越弱. 6.频率越高,波长越短,能量越大,穿刺能力越强(同物体内部穿过,入和出是同一个微波粒子,如X射线Y射线)。 且频率高带宽大,传输速率高,传播距离近(衍射能力弱,能量在穿刺工程中消耗)。 高频段频率资源丰富,系统容量大,但是频率越高,传播损耗越大,覆盖距离越近,绕射能力越弱。 另外,频率越高,技术难度也越大,系统的成本相应提高。
波在空中传输中时,波长越长当他遇到障碍物时,绕过障碍物的能力就越强,传输的距离就越远。 所以:频率越低,波长越长,穿透能力越强(绕射能力 强),传输过程中损失哀减越少,能传播距离越远。
频率越高,单位时间内的摆动次数就越多,能量就越高也就是穿透能力越强越不容易改变方向(衍射),但是穿透即会损失最终接收到微弱信号就没了,所以相对于频率低的它就容易绕开方向(衍射)同等距离在有障碍物的情况下,频率低的就穿得越远咯. 总结来说,选择使用哪种频率的无线电波,需要权衡其传输距离、损耗、技术难度和成本等因素。 频率的高低直接影响了通信的覆盖范围和质量,而实际应用中,往往需要根据特定场景和需求进行选择。
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