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This paper presents wideband bandpass filters with a novel microstrip configuration. Using quarter-wavelength resonators, internal coupling between resonators was realized by interdigital capacitors (IDC) and capacitive open-ended stubs. Impedance steps, was utilized for external couplings. Two wideband filters at L band and C band with a fractional bandwidth (FBW) of 48% and 76%, respectively, were...
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