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A Compact Triple Passband Bandpass Filter Using Stub Load - Uniform impedance Resonators

In this paper, a compact triple passband bandpass filter (BPF) using stub load - uniform impedance resonators (SL-UIRs) is proposed. The resonators can provide the multipath propagation to enhance the filter performance and compact circuit size. The multipath SL-UIRs is designed to have two resonant paths at 2.4, 3.5 and 5.2GHz for WLAN and 5G. The resonant frequencies can be easily controlled by tuning the length of the uniform impedance resonators. The proposed triple passband filter is showing a simple configuration, an effective design method and small circuit size. The measured results are in good agreement with the fullwave electromagnetic simulation results.