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On the basis of coupledline sections and impedance steps as inverter circuits, novel wideband and compact filters are presents. The compact broadband microstrip filter using a folded multiple-mode resonator contains only one resonator, which operates as not only a resonant element, but also an open stub. In addition, the filter owns a compact size, a broad passband, sharp skirts and two transmission...
A systematic procedure for designing harmonic-suppressed wideband microstrip bandstop filter (BSF) based on the frequency-selecting coupling structure (FSCS) is presented. This filter is added with shunt open stubs to introduce several attenuation poles to achieve a deeper rejection in the first and second stopband. The simulation result shows that the BSF has a wide 3 dB fractional bandwidth which...
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