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Yttrium Vanadate (YVO4) is a birefringent crystal material used in opticalisolators and circulators with potentials for application in cryogenicmicrowave devices. As microwave properties of the YVO4 are not known, wemeasured the complex permittivity at the frequency of 25 GHz, using theHakki-Coleman dielectric resonator technique in the temperature range from 13 Kto 80 K. The real part of relative permittivity of YVO4 turned out to besimilar to that of Sapphire - one of popular dielectric materials, used atmicrowave frequencies. The measured loss tangent tang {\delta} of the YVO4 wasof the order of 10^(-6) at cryogenic temperatures. As Yttrium Vanadate (YVO4)is easy to synthesis and machine, it may replace the expensive Sapphire in somemicrowave applications.

Microwave properties of Yttrium Vanadate at cryogenic temperatures