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A theoretical analysis method on attenuation of the compact GaAs MMIC bandpass filter using the structure of a diagonally short-ended coupled-line with capacitive loading, which is a potential solution to achieve extremely miniaturized size, is given in this paper. Based on this model, the factors related to the insertion loss performance are investigated. The experimental verification shows good agreement between theory and experiment. The proposed scheme can be used in the design and optimization of this kind of new miniaturized bandpass filter.
