An apparatus (100) for altering the velocity of a radio frequency signal generally comprises a first material (114) having an electrically tunable dielectric, and a second material (118) having a magnetically tunable permeability. The permittivity can be adjusted by varying a voltage (V1) applied to the first material, while the permeability of the second magnetic material can be adjusted by varying the strength of a magnetic field applied to the second magnetic material. Furthermore, the apparatus provides a circuit having a characteristic impedance which can be adjusted to match the characteristic impedance of electrical interconnect circuits.
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