Small ultra-wideband bandpass filter with notch performance
A technology of band-pass filter and notch wave characteristics, applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problems of filter size increase, filter reduction, not compact enough, etc., to reduce size and improve selectivity , the effect of flexible changes
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[0021] The present invention is a small ultra-wideband bandpass filter with notch characteristics, and a compact and highly selective ultrawideband bandpass filter is designed by adopting a method of cascading a quarter short-circuit stub and a parallel coupled microstrip The filter adds an open branch to make the filter have notch characteristics, which can filter out the interference of the wireless network. The center frequency of the band-pass filter selected in the present invention is 6.85 GHz, the pass-band frequency range is 3.1 GHz-10.6 GHz, and the relative bandwidth reaches 110%. The 50 ohm microstrip lines (1), (6) on the metal upper layer are used as energy input and output ports. The width of this microstrip line is determined to be 1.2mm by the center frequency of the filter, and the length is adjusted according to actual needs. The present invention selects 2mm . The length of the parallel coupled microstrip lines is 3.4mm, the width is 0.2mm, and the coupling...
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