Lithium tantalate - a high permittivity dielectric material for microwave communication systems

Lithium tantalate single crystal is characterized by very low thermal expansion and exhibits excellent electro-optical, piezoelectric and pyroelectric properties. We have studied the real part of relative permittivity (εᵣ) perpendicular to the crystal axis and the loss tangent of LiTaO₃ over the temperature range from 15 K to room temperature at a frequency of 11.4 GHz. The εᵣ and tanδ were determined by measurements of the resonance frequency and the unloaded Q-factor of a TE₀₁₁ mode cylindrical cavity containing the sample under test. The permittivity of LiTaO₃ was found to change from 38.9 to 41.1 and the loss tangent increased from 1.1 × 10⁻⁴ to 6.5 × 10⁻⁴ over the temperature range from 15 K to 295 K. Due to the low losses and high permittivity this material can be used in many microwave applications.

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Tencon 2003: conference on convergent technologies for Asia-Pacific Region

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0-7803-8162-9

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