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Wireless at 60 GHz Has Unique Oxygen Absorption Properties
by Shigeaki (Shey) Hakusui, President, Harmonix Corporation, April 10, 2001 | Original article here.
The demand for bandwidth is growing at a rapid pace. International Data Corporation projects that Internet commerce in the United States will grow from $74 billion in 1999 to $708 billion in 2003, with the number of computer users more than doubling from 81 million to 177 million in the U.S. alone. Due to the tremendous expected growth, reliable fiber optic networks must be installed quickly.
Short haul, high-density deployments of wireless communications devices are required in metropolitan areas and business parks throughout the United States. Most often, office buildings though not physically linked to the fiber backbone are within one half mile of a local fiber trunk. Wireless communication devices operating at higher frequencies, such as 60GHz, allow businesses to link to the fiber easily, without the cost and time delays associated with physical fiber installation.
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Figure 1: Dry Atmospheric Absorption per Kilometer
Due to the increased bandwidth demands and the scarcity of microwave frequency allocations, the wireless communications industry is beginning to focus on higher, previously unallocated portions of the spectrum in the millimeter wave frequencies from 40GHz to 300GHz. Due to the high levels of atmospheric RF energy absorption, the millimeter wave region of the RF spectrum is not usable in long haul, wireless communications segments. However, for short haul, "last mile" segments, the expanded RF data bandwidth available in the millimeter wave region makes it possible for high peed connectivity.