SAW filter for Bluetooth and WiFi

2 September 2009 Circuit & System Protection

Murata has developed a new SAW filter whose high power capability means it can be used as a top filter, replacing two interstage filters with a single component. In addition, the filter’s external matching circuit requires just two inductors.

The SAFEA2G45AC0F00 has a nominal centre frequency of 2450 MHz, suitable for Bluetooth and WiFi systems. Its high power capability means it can be used directly after the power amplifier, replacing two separate interstage filters in the transmit and receive paths. The resulting reduction in component count simplifies the design, lowers cost and saves space.

The filter can handle input signal levels of +27 dBm for 500 hours at up to 85°C, or +24 dBm for 5000 hours at up to 85°C. Voltage standing wave ratio (VSWR) is typically 1,4, with insertion loss typically 1,7 dB. Operating temperature is -30°C to +85°C.

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