Smart antennas to expand Wi-Fi range

IDG News Service - The first generation of Wi-Fi devices for corporate networks has generated a great deal of interest in the untethered workplace, but not as much revenue as vendors expected. However, several vendors hope to decrease the number of access points needed to sustain a wireless office by expanding the range of corporate wireless LANs and improving the signal quality using smart antennas.
Most antennas on Wi-Fi switches and routers are "dumb," in that they can do little more than detect electronic signals by locking onto the strongest signal they find emanating from a client device. A "smart" antenna actively searches an area for Wi-Fi signals, and can blend several weak signals into a strong signal without any prompting from the user.
Smart antennas aren't a new technology. Cell phone towers have used this technique for several years in helping to maintain a cell connection while the caller drives down the highway or walks across a city square. But the increasing ability of silicon chips to control the antenna and the cost savings that those chips offer have primed smart antenna technology for the next generation of Wi-Fi devices.
Smart antennas appeal to universities or owners of large buildings such as airports or convention centers that need to provide Wi-Fi coverage over a large area. But corporations setting up smaller indoor wireless networks probably won't see enough of a performance benefit to justify the cost, said Chris Kozup, research director at Meta Group Inc. in Stamford, Conn.
"Enterprises are looking for tools to make Wi-Fi easier to deploy, easier to manage and easier to secure," Kozup said. "Smart antennas are one of those, but they're not at the forefront of the list in providing that capability."
Enterprise technology buyers tend to feel overwhelmed by new technologies that are more difficult to understand, Kozup said. While a company might have several staff members comfortable with networking technologies, it might not have IT staff comfortable with managing radio frequency (RF) devices and would find it easier to just buy cheap access points from an established vendor like Cisco Systems Inc. to guarantee coverage, he said.

The smart antenna vendors present a solid case that it might cost more to manage a disparate network of access points than it would to acquire more sophisticated technology, "but the best technology doesn't always win," Kozup said.
Vivato Inc. uses the technology in its 802.11b Wi-Fi switches for large indoor or outdoor coverage areas, said Phil Belanger, vice president of marketing at San Francisco-based Vivato. The switches use

Reprinted with permission from

IDG.net
Story copyright 2009 International Data Group. All rights reserved.