A new tunable filter using love wave resonators for reconfigurable RF

A large number of frequency bands have been included in mobile phone handsets and in their RF front end circuit, RF paths have been increasing and the configuration has been becoming complex more and more. A new tunable filter is proposed in this paper. In order to realize a wide bandwidth SAW resonator using extension inductor, Love wave SAW resonator for the tunable filter can be obtained by the optimization of the Euler angle and Pt film thickness to avoid Rayleigh wave spurious and the bulk wave. A tunable filter is fabricated for the operation in the low frequency band of 669-960MHz which fractional bandwidth is 31.5%. This result shows promising possibility of a tunable filter for reconfigurable RF.