Gümüşsoy, S.Özbay, Hitay2016-02-082016-02-0820040167-6911http://hdl.handle.net/11693/24200In this note we consider a class of linear time invariant systems with infinitely many unstable modes. By using the parameterization of all stabilizing controllers and a data transformation, we show that ℋ ∞ controllers for such systems can be computed using the techniques developed earlier for infinite dimensional plants with finitely many unstable modes.EnglishH∞ controlInfinite dimensional systemsTime delayControl equipmentFeedbackInterpolationMathematical modelsOptimizationArticle10.1016/j.sysconle.2004.04.0071872-7956