This SAW filter for the transmitting RF circuit of GSM mobile communication equipment operating at 890 MHz ~ 915 MHz. MF1173V-1 TYPICAL CHARACTERISTICS Insertion Loss vs. Frequency 1 dB / REF 0 dB S11 SWR Input VSWR vs. Frequency 500 m / REF 1 [dB] 0 *1 *2 *3 *4