MONOLITHIC-CRYSTAL-FILTER AND MANUFACTURE THEREOF

摘要

PURPOSE: To synchronize each resonator with a desired operating frequency by connecting a printing circuit to each resonator so that a selective short circuit is allowed and defining a gap area to be formed as a permanent short circuit in a circuit pattern. CONSTITUTION: A monolithic crystal filter is provided with a multi-resonator crystal wafer 100 to be fixed and supported by a balanced printed circuit board 200 via an electric lead wire 300. The printing circuit and a pair of printing circuit patterns are included at the top of a first side of a board member 200 and the first side is provided away from and confronted with the wafer 100. The printing circuit is electrically connected to each resonator so that the selective short circuit of each resonator is allowed during finishing adjustment of the resonator. In addition, the gap area capable of being formed as the permanent short circuit is defined by a pair of printing circuit patterns after the finishing adjustment.