Abstract
A novel dual-mode filter composed of slot-line square loop resonator (SSLR) loaded with four slot-line stubs and four slot patches is presented. Two types of slot patches are loaded in each corner to split the degenerate modes flexibly. Two T-shaped feed lines are arranged orthogonally to provide a large external coupling as well as source-load coupling. A compact dual-mode SSLR filter with two upper transmission zeros operating at 3.55 GHz with 3.7% fractional bandwidth is designed and fabricated.
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