Lithium tantalate - a high permittivity dielectric material for microwave communication systems
Jacob, M.V., Hartnett, J.G., Mazierska, J., Krupka, J., and Tobar, M.E. (2003) Lithium tantalate - a high permittivity dielectric material for microwave communication systems. Proceedings of Tencon 2003: conference on convergent technologies for Asia-Pacific Region. Tencon 2003: conference on convergent technologies for Asia-Pacific Region , 15-17 October 2003, Bangalore, India .
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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.
|Item Type:||Conference Item (Refereed Research Paper - E1)|
|Keywords:||dielectric resonators; LiTaO3; loss tangent; mobile communication; permittivity|
|FoR Codes:||09 ENGINEERING > 0912 Materials Engineering > 091201 Ceramics @ 100%|
|SEO Codes:||89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890199 Communication Networks and Services not elsewhere classified @ 80%|
86 MANUFACTURING > 8616 Computer Hardware and Electronic Equipment > 861603 Integrated Circuits and Devices @ 20%
|Deposited On:||28 Jun 2010 11:43|
|Last Modified:||19 May 2013 01:01|
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