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This paper presents a new microstrip multilayer configuration in order to reduce the size of the microwave bandpass filters. To validate this approach, simulations and experimental investigations were made, and a compact stacked four-pole bandpass filter was designed, implemented and tested at 2.44 GHz. The experimental and simulated results on the filter are presented and discussed, and the comparison between them indicates a fairly good agreement. By using this multilayer configuration technique in the microwave filter design, a filter size reduction of about 50% can be easily achieved, which makes these compact filters well suited for mobile handset.