Abstract: Tunable pre-select filters are crucial components in wideband receiver, which directly effects on receiver performance. In this paper,a comb-shaped tunable filter is presented. The filter operates over a band width from 200MHz to 600MHz. The filter exhibits a 1dB band about 12%, insertion loss less than 3dB ,IIP2 more than 60dBm,IIP3 more than 20dBm,VSWR less than 1. 8 at both input and output port across the 200 ~600MHz band. The simulated results are good agreement with the measured ones. And also,this design has a relatively simple structure which is easy to implement in technology. In addition, this design exhibits excellent electrical properties such as ultra ovtave tuning range,low insertion loss,high IP2 and IP3.