A novel enlarging fractional bandwidth (FBW) technique for acoustic-wave-lumped-element resonator (AWLR) -based bandpass filters is present. The new technique is based on a series of matching inductors that replace the parallel or series acoustic wave (AW) resonators of AW filters to beak the bandwidth constraint of the ladder-type structure. In addition, the transmission response analysis of the proposed AWLR-based filter is provided. A prototype of the AWLR-based filter is fabricated and tested to validate the proposed FBW widening technique. The measured insertion loss, FBW, and out-of-band rejection are 1.5dB, 1.63kt2 (kt2 is the electromechanical coupling coefficient of the AWR), and 38dB, respectively.