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High selective bandpass filters with a pair of transmission zeros using right-angled triangular stepped-impedance resonators are proposed and analyzed. The transmission zeros on both sides of passband are attributed to the mixed electromagnetic coupling and capacitive source–load coupling, respectively. The transmission zeros locations from the central frequency can be adjusted by controlling the...
In this paper, inner T-shaped defected microstrip structure (DMS) is studied, and new bandstop filters with a single band, dual-band and tri-band are developed. The new designs have adjustable multi-band operation and simple circuit topologies, and the symmetrical periodic T-shaped DMS introduces transmission zeros which improve the filter frequency selectivity greatly. The circuit sizes are also...
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