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International Journal of Antennas and Propagation
Volume 2015, Article ID 291234, 6 pages
http://dx.doi.org/10.1155/2015/291234
Research Article

Dielectric Behavior of Low Microwave Loss Unit Cell for All Dielectric Metamaterial

1Advanced Materials Institute, Shenzhen Graduate School, Tsinghua University, Shenzhen 518055, China
2State Key Lab of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
3State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received 9 December 2014; Accepted 29 January 2015

Academic Editor: Roman E. Noskov

Copyright © 2015 Tianhuan Luo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With a deep study of the metamaterial, its unit cells have been widely extended from metals to dielectrics. The dielectric based unit cells attract much attention because of the advantage of easy preparation, tunability, and higher frequency response, and so forth. Using the conventional solid state method, we prepared a kind of incipient ferroelectrics (calcium titanate, CaTiO3) with higher microwave permittivity and lower loss, which can be successfully used to construct metamaterials. The temperature and frequency dependence of dielectric constant are also measured under different sintering temperatures. The dielectric spectra showed a slight permittivity decrease with the increase of temperature and exhibited a loss of 0.0005, combined with a higher microwave dielectric constant of ~167 and quality factor Q of 2049. Therefore, CaTiO3 is a kind of versatile and potential metamaterial unit cell. The permittivity of CaTiO3 at higher microwave frequency was also examined in the rectangular waveguide and we got the permittivity of 165, creating a new method to test permittivity at higher microwave frequency.