  Recent advances in hyperbolic metamaterials have spurred many breakthroughs
in the field of manipulating light propagation. However, the unusual
electromagnetic properties also put extremely high demands on its compositional
materials. Limited by the finite relative permittivity of the natural
materials, the effective permittivity of the constructed hyperbolic
metamaterials is also confined to a narrow range. Here, based on the proposed
concept of structure-induced spoof surface plasmon, we prove that arbitrary
materials can be selected to construct the hyperbolic metamaterials with
independent relative effective permittivity components. Besides, the
theoretical achievable ranges of the relative effective permittivity components
are unlimited. As proofs of the method, three novel hyperbolic metamaterials
are designed with their functionalities validated numerically and
experimentally by specified directional propagation. To further illustrate the
superiority of the method, an all-metal low-loss hyperbolic metamaterial filled
with air is proposed and demonstrated. The proposed methodology effectively
reduces the design requirement for hyperbolic metamaterials and provides new
ideas for the scenarios where large permittivity coverage is needed such as
microwave and terahertz focus, super-resolution imaging, electromagnetic
cloaking, and so on.
