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Experiments for radio detection of UHE particles such as e.g. ARA/ARIANNA orNuMoon require detailed understanding of the propagation of radio waves in thesurrounding matter. The index of refraction in e.g. polar ice or lunar rock mayhave a complex spatial structure that makes detailed simulations of the radiopropagation necessary to design the respective experiments and analyze theirdata. Here, we present RadioPropa as a new modular ray tracing code that solvesthe eikonal equation with a Runge-Kutta method in arbitrary refractivityfields. RadioPropa is based on the cosmic ray propagation code CRPropa, whichhas been forked to allow efficient incorporation of the required datastructures for ray tracing while retaining its modular design. This allows forthe setup of versatile simulation geometries as well as the easy inclusion ofadditional physical effects such as e.g. partial reflection on boundary layersin the simulations. We discuss the principal design of the code as well as itsperformance in example applications.

RadioPropa - A Modular Raytracer for In-Matter Radio Propagation