Lithium tantalate - a high permittivity dielectric material for microwave communication systems
Lithium tantalate - a high permittivity dielectric material for microwave communication systems
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DOI：
10.1109/tencon.2003.1273139
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发表时间：
2003-10
期刊：
影响因子：
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通讯作者：
M. Jacob;J. Hartnett;J. Mazierska;J. Krupka;M. Tobar
中科院分区：
文献类型：
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作者：
M. Jacob;J. Hartnett;J. Mazierska;J. Krupka;M. Tobar
钽酸锂单晶具有很低的热膨胀系数，并具有优异的电光、压电和热释电性能。我们研究了LiTaO/sub 3/在11.4GHz频率下从15 K到室温的垂直于晶轴的相对介电常数（/spl epsi//sub r/）的真实的实部和损耗角正切。通过测量包含测试样品的TE/sub 011/模式圆柱形腔的谐振频率和无负载Q因子来确定/spl epsi//sub r/和tan/spl delta/。在15 ~ 295 K的温度范围内，LiTaO/sub 3/的介电常数从38.9变化到41.1，损耗角正切从1.1 /spl × 10/sub-4/增加到6.5 /spl × 10/sub-4/。由于低损耗和高介电常数，这种材料可用于许多微波应用。
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 (/spl epsi//sub r/) perpendicular to the crystal axis and the loss tangent of LiTaO/sub 3/ over the temperature range from 15 K to room temperature at a frequency of 11.4 GHz. The /spl epsi//sub r/ and tan/spl delta/ were determined by measurements of the resonance frequency and the unloaded Q-factor of a TE/sub 011/ mode cylindrical cavity containing the sample under test. The permittivity of LiTaO/sub 3/ was found to change from 38.9 to 41.1 and the loss tangent increased from 1.1 /spl times/ 10/sub -4/ to 6.5 /spl times/ 10/sub -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.