Patent ID: 7495530
Filing Date: 2009-02-24
Classification: H01P

Abstract:
1. A dual-band filter, comprising: an input line for inputting electromagnetic signals; a first transmission line electronically connected to the input line; a second transmission line arranged parallel to the first transmission line; a third transmission line arranged between, and parallel to, the first transmission line and the second transmission line, wherein the third transmission line comprises a first protrusion and a second protrusion; and an output line arranged parallel to the input line and electronically connected to the second transmission line, for outputting the electromagnetic signals; wherein the first transmission line comprises a first free end, a second free end, and a first recessed portion arranged between the first free end and the second free end, the second transmission line comprises a third free end, a fourth free end and a second recessed portion arranged between the third free and the fourth free end, the first recessed portion is defined opposite to the second recessed portion, the first protrusion extends into a part of the first recessed portion, and the second protrusion extends into a part of the second recessed portion.