Switchable SAW filter, SAW-filter device and method of operating the same

摘要

The filter has a weighted input converter unit (EW) with two partial tracks comprising two partial apertures. An output converter unit (AW) whose aperture corresponds to the sum of the both partial apertures, where the filter has two transfer functions that can be realized through parallel or anti-parallel switching of the tracks. The unit (EW) has a split finger arrangement and a screening structure is provided between the units. Independent claims are also included for the following: (A) a switchable filter device comprising a SAW filter; and (B) a method for operating a SAW filter switching between two different transfer functions.