4 ms·

I'm curious about the use cases for 275 ghz wireless communication, are microwave links still common? it's almost far infrared

woah 3y ago
Microwave links are very common
wrs 3y ago
WiFi is microwaves.
ianburrell 3y ago
The same use as optical wireless like LiFi. Higher speed over short distances. Optical has the advantage to bouncing off walls, but EHF may have bandwidth advantages. This wouldn't be useful for microwave links since it is absorbed by the atmosphere and has short range. 275 GHz is one the edge of EHF. Terahertz is 300 GHz to 3 THz. Above that is infrared.
- aidenn0 3y ago
  > This wouldn't be useful for microwave links since it is absorbed by the atmosphere and has short range. Nit-pick; 275GHz isn't terrible for atmospheric absorption. What gets you is the phase dispersion when the humidity is high.
_fizz_buzz_ 3y ago
By far most communication is in the microwave bands, such as WiFi, cell phones, Bluetooth
- Palomides 3y ago
  sure, but wifi doesn't go over 6ghz for plenty of reasons edit: forgot about 60ghz wifi
  - westbywest 3y ago
    60GHz wifi products are pretty common now. With the notable quirk of having difficulty passing through paper.
    - mometsi 3y ago
      Paranoiacs will be finally be able to wear regular hats!
jackson1442 3y ago
My ISP actually uses microwave links! I get consistent gigabit speeds with them.
lovelearning 3y ago
From the PDF: > Requirements for 6G include extremely high data rates (>100 Gbit/s), ultra-low latency (<0.1 ms).... > For the wireless communication of the 6G era, new radio frequency bands in sub-THz, ranging from 100 GHz to 300 GHz, have been identified as one of the most promising bands. > There is also a technical challenge for seamlessly connecting wireless communication systems with fiber-optic communication networks
inemesitaffia 3y ago
Satcom downlinks for laser connected sats
aidenn0 3y ago
Seems useful as a cable-replacement for e.g. uncompressed video; DisplayPort tops out at 10.8 Gbps, so even allowing a 19x reduction for "real world" limitations, you could send DP over 20 meters with this.
hermitdev 3y ago
> are microwave links still common? Yes, they have their purposes. I work in finance and we use microwave links to talk between systems in Chicago & New York. Fiber links are the backup, here! The reason is purely latency as the bandwidth of the fiber links is orders of magnitude higher. The major downside is the microwave links drop quite frequently as they're sensitive to the totality of the weather between data centers (e.g. any sort of precipitation as a crow flies between NYC & CHI and there's potential for dropped links).

woah 3y ago

Microwave links are very common

wrs 3y ago

WiFi is microwaves.

ianburrell 3y ago

The same use as optical wireless like LiFi. Higher speed over short distances. Optical has the advantage to bouncing off walls, but EHF may have bandwidth advantages. This wouldn't be useful for microwave links since it is absorbed by the atmosphere and has short range. 275 GHz is one the edge of EHF. Terahertz is 300 GHz to 3 THz. Above that is infrared.

aidenn0 3y ago
> This wouldn't be useful for microwave links since it is absorbed by the atmosphere and has short range. Nit-pick; 275GHz isn't terrible for atmospheric absorption. What gets you is the phase dispersion when the humidity is high.

_fizz_buzz_ 3y ago

By far most communication is in the microwave bands, such as WiFi, cell phones, Bluetooth

Palomides 3y ago
sure, but wifi doesn't go over 6ghz for plenty of reasons edit: forgot about 60ghz wifi
- westbywest 3y ago
  60GHz wifi products are pretty common now. With the notable quirk of having difficulty passing through paper.
  - mometsi 3y ago
    Paranoiacs will be finally be able to wear regular hats!

jackson1442 3y ago

My ISP actually uses microwave links! I get consistent gigabit speeds with them.

lovelearning 3y ago

From the PDF: > Requirements for 6G include extremely high data rates (>100 Gbit/s), ultra-low latency (<0.1 ms).... > For the wireless communication of the 6G era, new radio frequency bands in sub-THz, ranging from 100 GHz to 300 GHz, have been identified as one of the most promising bands. > There is also a technical challenge for seamlessly connecting wireless communication systems with fiber-optic communication networks

inemesitaffia 3y ago

Satcom downlinks for laser connected sats

aidenn0 3y ago

Seems useful as a cable-replacement for e.g. uncompressed video; DisplayPort tops out at 10.8 Gbps, so even allowing a 19x reduction for "real world" limitations, you could send DP over 20 meters with this.

hermitdev 3y ago

> are microwave links still common? Yes, they have their purposes. I work in finance and we use microwave links to talk between systems in Chicago & New York. Fiber links are the backup, here! The reason is purely latency as the bandwidth of the fiber links is orders of magnitude higher. The major downside is the microwave links drop quite frequently as they're sensitive to the totality of the weather between data centers (e.g. any sort of precipitation as a crow flies between NYC & CHI and there's potential for dropped links).