Radio frequency filter applicable to WCDMA (wideband code division multiple access)

The invention is applicable to the technical field of wireless communication and provides a radio frequency filter applicable to WCDMA (wideband code division multiple access). The radio frequency filter comprises a piezoelectric crystal substrate and a radio frequency filter chip disposed on the surface of the piezoelectric crystal substrate. Sound-absorbing material is attached onto the upper surface of the piezoelectric crystal substrate. The radio frequency filter chip comprises a transduction circuit composed of two input transducers, an input bandwidth regulating transducer, two output transducers and an output bandwidth regulating transducer; the two input transducers are serially connected with each other; the input bandwidth regulating transducer is connected in parallel between the input transducers; the two output transducers are connected in series; the output bandwidth regulating transducer is connected in parallel between the output transducers. The frequencies of series and parallel circuits are regulated by changing the relation between the series transducers and the parallel transducers, pass bandwidth is more accurately regulated, and compatibility under better suppression of pass bandwidth is available.