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Microwave antennas based on Ba1-xPbxNd2Ti5O14

M. ENE-DOBRE1, M. G. BANCIU2, L. NEDELCU2, G. STOICA3, C. BUSUIOC2,4, H. V. ALEXANDRU1

Affiliation

  1. University of Bucharest, Faculty of Physics, Magurele 077125, Romania
  2. National Institute of Materials Physics, Magurele 077125, Romania
  3. ARMTECH S.A., Curtea de Arges 115300, Romania
  4. University POLITECHNICA of Bucharest, Faculty of Applied Chemistry and Materials Science, Bucharest 011061, Romania

Abstract

The Ba1-xPbxNd2Ti5O14 ceramic material (BNT) is very attractive for applications at frequencies around few GHz [1]. The temperature coefficient of the resonant frequency τf decreases from + 70 ppm/o C to – 15 ppm/o C with the Pb content x increase up to 0.5. The samples with high Pb content exhibit a dielectric constant up to 86.6, but the product Q x f is several times lower than for such microwave ceramics as zirconium tin titanate [1-2]. When a product Q x f higher than 6000 is required in order to use the BNT materials at high frequencies, then the Pb content can result from the tradeoff between small temperature coefficient τf and high quality factor Q. The features of the BNT dielectric resonators lead to the development of miniaturized dielectric resonator antenna (DRA) with improved characteristics. The DRAs of BNT ceramics presented in this paper exhibit an increased bandwidth due to an optimal height over diameter ratio. For an increased gain and shaping of the overall radiation pattern, an array of dielectric resonator antennas is proposed..

Keywords

Antenna, Microwave, Ba-Pb-Nd-Ti-O.

Submitted at: July 19, 2011
Accepted at: Oct. 20, 2011

Citation

M. ENE-DOBRE, M. G. BANCIU, L. NEDELCU, G. STOICA, C. BUSUIOC, H. V. ALEXANDRU, Microwave antennas based on Ba1-xPbxNd2Ti5O14, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 10, pp. 1298-1304 (2011)