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Press Release

Atheros USB2.0 802.11a/g WLAN Technology Unwires Desktop PCs in Japan

I-O Data and NEC Access Technica Introduce Wireless Adapters Using Atheros’ Highly-Integrated Chipset and Super AG® Features

SUNNYVALE, Calif., June 1, 2005—Atheros Communications, Inc. (NASDAQ: ATHR), a leading developer of advanced wireless LAN (WLAN) chipsets, today announced that its AR5005UX WLAN chipset is featured in new 802.11a/g USB2.0 network adapters from I-O Data Device, Inc. and NEC Access Technica, Ltd. The Atheros solution fits entirely onto a board that’s only 2.57 inches by 0.96 inches; creating a small wireless footprint that can be embedded into a wide range of computing and CE devices. The I-O Data WN-AG/US and NEC Access Technica AtermWL54TU adapters are the first USB2.0 WLAN products in Japan to support 802.11a, 802.11g and 802.11b networks. These products also support Atheros’ popular Super AG® performance-enhancement features.

The adapters connect to any open notebook PC or desktop PC’s USB2.0 port to enable high performance wireless networking. The dual-band 802.11a/g chipset provides reliable networking compatible with all the 802.11 standards. Operation in both the 2.4GHz and 5GHz frequency bands allows people to segment their wireless office or home networks for improved performance and reliability. Communication in the uncrowded 5GHz band enables a reliable wireless connection free from potential interference within the crowded 2.4GHz band. People can stream photos, movies, and music over the 5GHz 802.11a network without being affected by 2.4GHz devices such as microwave ovens, cordless phones, and 802.11b and 802.11g networks.

“The AR5005UX chipset makes it easy to install any PC device to a home or office wireless network using the popular USB2.0 interface,” said Dr. Tomoki Ohsawa, general manager of Atheros Communications K.K. “I-O Data and NEC Access Technica are the first to offer USB2.0 WLAN adapters that support dual-band 802.11a/g operation. Combined with our Super AG technology, these products create an enhanced wireless user experience based on network performance, range and robust security.”

Atheros’ popular Super AG performance-enhancement features are featured in the new USB2.0 WLAN adapters from I-O Data and NEC Access Technica. Super AG employs multiple techniques, including packet bursting, fast frames, and data compression – that dramatically increase the throughput and range of wireless networking products. The technology supports up to 54 megabits-per-second (Mbps) link rates for users in Japan, with typical end-user throughput of up to 40 Mbps based on Atheros’ results. Outside Japan, with an additional dynamic turbo mode activated, the technology can achieve throughputs of more than 60 Mbps for typical data.

The AR5005UX supports the latest WLAN security standards including Advanced Encryption Standard (AES), enabling real time support for full 802.11i security. AES encryption is supported by all of Atheros 802.11a/g and 802.11g chipsets, allowing real-time encryption with no degradation of operating data rates for the computing, consumer electronics and wireless broadband markets. Atheros also supports the 802.11e Quality of Service (QoS) specifications, providing advanced features for delivering wired-quality video and audio content via a wireless connection.

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, the Atheros logo and Super AG 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, security, capabilities and benefits of Atheros’, I-O Data’s and NEC Access Technica’s products and the incorporation of Atheros’ wireless technology into I-O Data’s and NEC Access Technica’s USB2.0 network adapters, 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, whether I-O Data and NEC Access Technica continue to incorporate Atheros’ products into their respective adapters and whether they are successful in selling significant quantities of these adapters; the effects of competition; general economic conditions; and other risks detailed in Atheros’ Quarterly Report on Form 10-Q for the quarter ended March 31, 2005 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