Biomedical Engineering Reference
In-Depth Information
Fig. 3
Worldwide 60-GHz
band availability
Fig. 4
Attenuation due to
oxygen absorption in 60-GHz
band
frequencies and wide bandwidth digital processing are achievable at reasonable costs,
form factor and energy efficiency. Current solutions are mainly based on CMOS and
SiGe IC technology [
26
]. The wavelength of 5 mm provides perfect conditions for
fabrication and integration of on-chip directional antennas. This fact is supporting
the consideration of the 60-GHz wireless radios as a valuable candidate for the SoC
(system on chip) and NoC (network on chip) concepts for future communication
technology.
The fact that radio waves in this band experience high path loss and attenuation
due to oxygen limits the operational range of 60-GHz wireless networks within short-
range WLAN and PAN applications. The RF absorption peak at 60-GHz band due to
atmospheric resonance with oxygen molecules should not be taken as limitation for
low-power transmissions as it starts to become significant for range which is greater
than 100 m (Fig.
4
). It is well known that low-power transmissions do not propagate
so far, and this is an advantage for realizing higher frequency reuse density. The free
space path loss over 1 m at 60 GHz is around 68 dB which is more than 21 dB worse
comparing with the band at 5 GHz.
However, even with those constraints, the application field for 60-GHz wire-
less networks is still wide, targeting applications from high speed files exchange,
multimedia and entertainment systems to security, surveillance and biomedical
applications.
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