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A Varactor-tunable Filter with Constant Bandwidth and Loss Compensation

This article presents the basic concept and realization of a bandpass varactor-tunable filter with constant bandwidth and loss compensation. The filter components are based on step-impedance planar resonators, while the equalizing circui...
Varactor-tunable filters attract the attention of microwave specialists due to a number of advantages that can improve the overall performance of communications and radar receivers, as well as measuring equipment. One of the drawbacks of such filters is a considerable variation in bandwidth (BW) and insertion losses (IL) within...
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