Ladder-type electric filter device
AssigneeNgk Spark Plug Co., Ltd.
InventorKenji Kawakami
Life of this patent
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Abstract
A ladder-type electric filter comprising an input terminal, an output terminal, a plurality of series-resonators connected in series between said input terminal and said output terminal and a plurality of parallel-resonators each connected in parallel to the associated series-resonator, wherein each series-resonator has capacitance greater than that of the preceding series-resonator for improving a group delay time characteristic.
Claims5
A ladder-type electric filter comprising an input terminal, an output terminal and a plurality of resonator units connected between said input terminal and said output terminal, each resonator unit including a series-resonator and a parallel-resonator which are L connected, the series-resonators of said resonator units connected in series between said input terminal and said output terminal having capacitance values which increase in magnitude from the series-resonator of one of said plurality of resonator units arranged closest to said input terminal to the series-resonator of further one of said plurality of resonator units arranged closest to said output terminal.
A ladder-type electric filter comprising an input terminal, an output terminal and at least two resonator units connected between the input terminal and the output terminal, each resonator unit comprising a series-resonator and a parallel-resonator which are L connected, the series-resonator of one of said resonator units arranged closest to the output terminal having a capacitance larger than that of the series-resonator of another one of said resonator units arranged closest to the input terminal.
Dependencies are inferred from the claim text.