The Benefits of 60 GHz Unlicensed Wireless Communications
Point-to-point wireless systems operating at 60 GHz have been used for many years by the intelligence community for high security communications and by the military for satellite-to-satellite communications. Their interest in this frequency band stems from a phenomenon of nature: the oxygen molecule (O2) absorbs electromagnetic energy at 60 GHz like a piece of food in a microwave oven (see Figure 2). This absorption occurs to a much higher degree at 60 GHz than at lower frequencies typically used for wireless communications. This absorption weakens (attenuates) 60 GHz signals over distance, so that signals cannot travel far beyond their intended
recipient. For this reason, 60 GHz is an excellent choice for covert satellite-to-satellite communications because the earth’s atmosphere acts like a shield preventing earth-based eavesdropping. Because of the rich legacy of applications in this band, a wide variety of components and subassemblies for 60 GHz products are available today.
https://www.fcc.gov/file/14379/download
Reading this, you would never imagine that oxygen was used by life on Earth.
Even worse, 60 GHz is unlicensed and used in gifi (GHz-wifi) in such useful places like schools and hospitals.
Breathe... while you still can.
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Read something informative after a long time , i haven't yet gone through the entire downloaded file but this figure 2 below , does this shows that the graph at 60 GHz is only effective for the fcc allocation as after 70 and before 50 the graph is almost the same ?
It has been a long time since i read any graph , did it when i was in high school.
I'm not sure I understand. That is the absorption spectrum, with a focus on O2 - it isn't a perfect spike because the resonant frequency of any individual molecule also has thermal components. What it does show is that the band 60 +/- 5 has been allocated by the FCC. It also has a range so that sending and receiving frequencies are slightly different, else a receiver can pick up the signals it itself is sending! lol
Sender receiving the signal itself , that would be fully lol.