BAND STOP FILTER FOR DUAL FREQUENCY BANDS

摘要

PURPOSE: A double band stop filter is provided to be operated in at least two bands by executing phase cancellation through a first and a second transmission line. CONSTITUTION: A first transmission line(110) is connected to an input terminal(100) and an output terminal(130). The first transmission line generates a negative phase delay in a low frequency band and generates a positive phase delay in a high frequency band. The first transmission line has a CRLH(Composite Right/Left-Handed) structure. A second transmission line(120) is connected to the input terminal and the output terminal to be parallel to the first transmission line. The second transmission line generates a positive phase delay in a low frequency band and generates a negative phase delay in a high frequency band. The second transmission line has a D-CRLH(Dual-CRLH) structure.