| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high rejection stop band filter and a diplexer using such filters. <P>SOLUTION: The stop band filter comprises on a substrate 30 with a ground plane, a transmission line extending between an input (port 1) and an output (port 2) and comprises several resonators (31a, 31b, 31c, 31d) formed of "stubs" in a printed open circuit embedded into the transmission line. The resonators are positioned in parallel together and interconnected in series in the same direction or head to tail (32a, 32b, 32c). The filters are particularly useful in mobile devices operating in two concurrent frequency bands. <P>COPYRIGHT: (C)2013,JPO&INPIT |
