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A novel microwave active bandpass filter structure, using a combination of microstrip line resonators and FETs, is described. The resulting filter not only produces positive gain but also has good performance regarding sharpness of skirts, rejection, and input and output return losses. Capability of constructing wider bandwidth and its superior performance at harmonic band frequencies over an end‐coupled filter structure are among advantages of this design.
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Moazzam et al. (1992) studied this question.
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