Asymmetric SIR loaded wide stop band suppression broadband band-pass filter
A band-pass filter and wide stop-band technology, applied in the field of microwave devices, can solve the problems of high insertion loss, large size, complex structure, etc., and achieve the effects of high selectivity, high suppression level, and simple implementation process.
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[0021] combine figure 1 with figure 2 , in the preferred embodiment described below, a kind of asymmetrical SIR loaded wide stopband suppression broadband bandpass filter, comprises: dielectric substrate 1, the metal ground plate 2 that is fixed below the bottom plane of dielectric substrate 1, and is located in the dielectric The multimode filter circuit above the substrate 1 is characterized in that: the multimode filter input port P in Connect to the first interdigital feed structure through a 50-ohm microstrip line, load the stepped impedance resonator SIR on the lower left side of the multimode resonator, and the SIR loading direction is parallel to the symmetry axis T-T of the multimode resonator * , the second interdigital feed structure passes through the 6th microstrip line and P out The ports are connected, and the first interdigital feed junction and the second interdigital feed structure are about T-T * Axis mirror symmetry, two about T-T * The axisymmetric in...
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