※ 引述《beareyes (熊眼)》之铭言： : 把讯号升到高频的好处 : 以前我只知道 避免低频杂讯，接收天线较短 : 但後来听到有人说"可传送的bit rate较高" : 请问这是为什麽呢? : 另外 : 升到高频有什麽缺点吗? : 刚进入通讯这行不久 : 有很多知识不懂 : 谢谢大家帮忙 advantages using higher frequency bands ．larger instantaneous bandwidth for greater transfer of information ．higher resolution for radar , bigger doppler shift for CW radar , and more detailed imaging and sensing ．reduced dimensions for antennas and other components ．less interference from nearby applications ．fast speed for digital system signal processing and data transmission ．less crowded spectrum ．difficulty in jamming (military application) disadvantages using higher frequency bands ．more expensive components ．higher atomspheric losses ．reliance on GaAs instead of Si technology ．higher component losses and lower output power from active devices ．less accurate design tools and less mature technologies --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 111.249.129.114 数位通讯中用Gigabit/sec来描述数位资料传递的速度，这个会对应到它需要占用的频宽 ，愈宽的频宽，可以传送的数位资料的数度愈快。频率比较高时，一样是相对频宽5%，60 GHz*5%和2GHz*5%，对应到的绝对频宽当然是用60GHz比较大，绝对频宽愈宽，提供上述的 数位通讯的频宽就愈大，可以传输的速度就愈快。 ※ 编辑: big1p 来自: 1.160.78.8 (09/23 23:55)