Band pass filter for mobile radio application, has dielectric, which is made piezoelectric during application of current, and transverse branch, which is switched to line over which resonator electrode is connected with voltage source

摘要

The filter has an upper electrode and a radio frequency signal line in which a resonator is arranged. A switchable direct current voltage source (DC) is provided on the line. A dielectric (D) made of ferroelectric material becomes piezoelectric during the application of direct current. A transverse branch is switched to the signal line over which an electrode of the resonator is connected with the voltage source.