Aruba Networks Launches Dual-Band 802.11a+b/g Outdoor
Access Point Using Atheros Communications Chipset

New Weather-resistant Access Point Extends Enterprise Networks Outdoors; Enables Wireless Bridges between Buildings in Campus Environments

SUNNYVALE, Calif., April 21, 2005—Atheros Communications, Inc. (NASDAQ: ATHR), a leading developer of advanced wireless LAN (WLAN) chipsets, today announced that its dual-band 802.11a/b/g chipset, AR5002AP-2X, is featured in Aruba’s new multi-purpose, dual-band outdoor access point (AP). The Aruba 80 enables enterprises to operate 802.11a and 802.11b/g wireless networks concurrently.

The Aruba 80 is a fully-hardened dual-radio 802.11a+b/g AP that’s ideally suited for extending enterprise wireless networks to transportation loading bays, manufacturing sites, campuses, and office parks. It can also be used to wirelessly connect buildings instead of running expensive leased lines between office buildings. In these environments, the AP provides the wireless backhaul for transferring very large data files in point-to-point or point-to-multipoint wireless bridging environments.

The Aruba 80 access point uses both the 2.4GHz and 5GHz frequency bands, allowing enterprises to segment their wireless networks for improved performance and reliability. Use of the 5GHz band enables a reliable wireless connection free from potential interference within the crowded 2.4GHz band. Also important for planning network scalability, the 5GHz band provides an additional 13 non-overlapping channels on top of the three channels available in the 2.4GHz band. This enhances the flexibility of where to place a wireless access point and how-to minimize interference while maximizing network performance.

“Our new Aruba 80 lets enterprises extend user mobility and the reach of their wireless network across their entire organization,” said Ken Jensen, director of Product Management for Aruba. “Atheros’ dual-band 802.a/b/g technology offers high performance and scalability for enterprises that need to install large wireless networks now or in the future. Our customers will be able to roll out the Aruba 80 as a traditional AP indoors or outdoors — with all of Aruba’s advanced features — or use it as a wireless bridge.”

Craig Barratt, president and chief executive officer of Atheros Communications, added, “Wireless LAN technology is no longer confined to indoor applications or traditional networking environments. It’s being used to wirelessly connect buildings and create wireless campuses extending access across an entire enterprise. We’re pleased to be working with Aruba to meet enterprises’ needs with advanced wireless chipset technology that supports dual-band operation, using both the 802.11a and 802.11b/g protocols.”

About Atheros Communications, Inc.

Atheros Communications is a leading developer of semiconductor system solutions for wireless communications products. Atheros combines its wireless systems expertise with high-performance radio frequency (RF), mixed signal and digital semiconductor design skills to provide highly integrated chipsets that are manufacturable on low-cost, standard complementary metal-oxide semiconductor (CMOS) processes. Atheros technology is being used by a broad base of leading customers, including personal computer and networking equipment manufacturers. For more information, visit www.atheros.com  or send email to info@atheros.com.

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Atheros and the Atheros logo are trademarks of Atheros Communications, Inc. All other trademarks mentioned in this document are the sole property of their respective owners.

FORWARD-LOOKING STATEMENTS:

Except for the historical information contained herein, the matters set forth in this press release, including statements regarding the features, performance and benefits of Atheros’ and Aruba’s products, and the potential applications of these products, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially, including, but not limited to, difficulties in development and manufacture of new products and upgraded products, unforeseen problems in the performance of products upon broad deployment of these products, and other risks detailed in Atheros’ Annual Report on Form 10-K for the year ended December 31, 2004 as filed with the SEC and in other reports filed with the SEC by Atheros from time to time. These forward-looking statements speak only as of the date hereof. Atheros disclaims any obligation to update these forward-looking statements.

For press contact: Cheryl Patstone, 408-773-5344, cheryl@atheros.com, or Greg Wood, A&R Partners, 650-762-2838, gwood@arpartners.com,

For analyst contact: Deborah Stapleton, Investor Relations for Atheros, 650-470-0200, deb@stapleton.com