  This paper proposes an simple but yet effective approach to structured
parametric controller design in a linear fractional form. The main contribution
consists in using structured $\mathcal{H}_\infty$ oriented optimization tools
in an original manner to either (i) construct a parametric controller or (ii) a
family of controllers with varying performances. Practical and numerical issues
are also discussed to provide readers and practitioners a simple way to deploy
the proposed process. The overall approach is illustrated through two numerical
academical (but still complex) examples illustrating two applications: first, a
parametric controller design adapted to a parameter dependent model of a
clamped beam and, second, a controller with parameter dependent performance
applied on a building model.
