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BAW filters enable WiMAX and WLAN co-existence

Posted: 09 Jun 2008     Print Version  Bookmark and Share

Keywords:bulk acoustic wave  wireless local area networks  WiMAX networks  frequency bands 

Skyworks Solutions, Inc. introduced the 'industry's first' bulk acoustic wave (BAW) filters for customer premise equipment (CPE) to allow co-existence between wireless local area networks (WLAN) in the home and enterprise, and WiMAX networks which cover wider areas including neighbourhoods and cities.

"WiFi and WiMAX are converging markets and OEMs have a critical need for both signals to co-exist on the same device," said Stan Swearingen, Skyworks' vice president and general manager.

As both networks operate at very closely spaced frequency bands, these unique BAW filters reject the interfering frequencies while allowing the desired signals to pass for the selected network. The SKY33107 is a WiFi reject/WiMAX pass, and the SKY33108 is a WiFi pass/WiMAX reject, BAW filter.

Both 3 x 3 millimeter (mm) devices, SKY33107 and SKY33108 have very low in-band insertion loss and input and output return loss. They also exhibit excellent rejection – in the 2.4 gigahertz (GHz) WLAN band for the SKY33107, and 2.495-2.690 GHz WiMAX band for the SKY33108. The SKY33107 is intended for use in 2.495-2.690 GHz WiMAX band transmitter applications, which also contain WLAN 802.11 b, g, n transmitters, while the SKY33108 is targeted at 2.400-2.473 GHz WiFi band transmitter applications, which also encompass 2.495-2.690 GHz WiMAX transmitters. Both filters can operate over a -20 to 85° celsius temperature range and are available in a lead (Pb)-free, restriction of hazardous substances (RoHS)-compliant package.

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