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Hyperbolic metamaterials were initially proposed in optics to boost radiationefficiencies of quantum emitters. Adopting this concept for antenna design canallow approaching long-standing challenges in radio physics. For example,impedance matching and gain are among the most challenging antenna parametersto achieve in case when a broadband operation is needed. Here we pro-pose andnumerically analyse a new compact antenna design, based on hyperbolicmetamaterial slab with a patterned layer on top. Energy from a subwavelengthloop antenna is shown to be efficiently harvested into bulk modes of themetamaterial over a broad frequency range. Highly localized propagating waveswithin the medium have a well-resolved spatial-temporal separation owing to thehyperbolic type of effective permeability tensor. This strong interplay betweenchromatic and modal dispersions enables routing different frequencies intodifferent spatial locations within compact subwavelength geometry. An array ofnon-overlapping resonant elements is placed on the metamaterial layer andprovides a superior matching of localized electromagnetic energy to the freespace radiation. As the result, two-order of magnitude improvement in lineargain of the device is predicted. The proposed new architecture can find a usein applications, where multiband or broadband compact devices are required.

Efficient radiational outcoupling of electromagnetic energy from hyperbolic metamaterial resonators