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Tunable electromagnetic wave absorbers for the microwave range comprise polymer-liquid composites, made up of structures of definite shape from low dielectric constant polymer dielectric, filled with polar liquids. Tuning of reflection coefficient is performed in several ways: filling or removal of liquid from the structure, changing composition or temperature of liquid, etc. Effective absorption of electromagnetic waves by these structures in a wide range of frequencies is realized in case frequency dependence of dielectric constant of the liquid is such that for the whole range the condition of resonance absorption is fulfilled.The advantages of polar liquid dielectrics as absorbing media are demonstrated. Absorbing properties of structures with polar liquids and solutions of different salts are compared. Reflection coefficients for several structures of "dielectric on metal" type were measured.

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