The Envelope Constrained Filter (ECF) concept seems to be a useful tool in filter response shaping applications. There are several applications in radar techniques where the ECF concept can be utilised, such as the range sidelobe suppression in the receiver filter design or the antenna pattern sidelobe suppression in the antenna design. However, the nonfeasible solution case is almost always encountered with these applications. Moreover, a minimax feature of the filter designed is desired then. The original algorithms did not prove successful in such a scenario. The paper presents a novel approach to the ECF design, the main feature of which is the minimax behaviour in the nonfeasible solution case.
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