A C-sandwich radome structure includes a first core, an outer skin layer on the first core, a second core, and an inner skin layer on the second core. An intermediate skin layer is disposed between the first core and the second core and the intermediate skin layer includes a dielectric enhancer for raising the dielectric constant of the intermediate skin layer so the intermediate skin layer can be made thinner to reduce the weight and cost of the structure while maintaining the electrical transmission performance of a thicker, heavier intermediate skin layer.