Patent ID: 6043725
Filing Date: 2000-03-28
Classification: H03H

Abstract:
A filter circuit having plural passbands, comprising:a first filter having a first passband,a second filter having a second passband higher than the first passband, the first filter being connected with the second filter such that at least one input terminal and one output terminal of the first filter is connected in parallel with at least one input terminal and one output terminal of the second filter, andan inductor element connected in series to a terminal of the first filter that is connected to a terminal of the second filter,wherein, when a connection point of the first filter and the second filter is severed, an input impedance of the second filter in the passband of the first filter is not present in a range substantially regarded to be infinite, and an input impedance of the first filter in the passband of the second filter is not present in a range substantially regarded to be infinite.