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In this paper, a new type of microstrip resonator is presented, i.e., the circular wire-patch resonator. This component exhibits interesting electrical performances, including very compact dimensions and the possibility of high integration in multilayer low-temperature co-fired ceramic modules. For this new resonator, a transmission-line model, a finite-element-method analysis, and an application in filter design and some measurements are presented. Experimental results are discussed and compared with the theoretical and numerical ones showing a good agreement.