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Compact microstrip pseudo-interdigital stepped impedance bandpass filters with improved stopband performance

In this paper we present design of a compact microstrip pseudo-interdigital stepped impedance bandpass filter with improved stopband performance. Stepped-impedance resonators are used to maximise the ratio between higher order and fundamental resonances. The improved stopband performance is realized using additional spur line and open-stub sections used for creation of transmission zeros. Total size of the filter is 30.1×7.2 mm. The stopband extension up to 5.7f0 has been achieved.