The development of a planar resonant absorber based on the dielectric resonance mechanism is presented. The dielectric resonator is made from a magnetic sheet absorber composed of typical lossy materials. A design guideline is provided on how to enable the broadband operation of the absorber. The method has been implemented to develop a free space and surface wave absorber. Integrating with a bandpass frequency selective surface (FSS), the composite structure serves as a radome absorber.