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A study of patch antennas on ZST substrate

O. G. AVĂDANEI1, A. IOACHIM2,* , P. GASNER1, G. N. PASCARIU1, V. PASCARIU1

Affiliation

  1. “Al. I. Cuza” University of Iaşi, Romania
  2. INFIM Bucharest, Romania

Abstract

Compactness of microstrip antennas has made them very attractive for applications in communication systems. As the need for antenna miniaturization continues, a possible solution is offered by the utilization of high dielectric constant materials as substrate. The purpose of this paper is the study of patch antennas on high permittivity dielectric substrates (Zr0.8 Sn0.2)TiO4 – ZST. A comparative investigation of different types of patch and arrays was performed Two substrate thickness h1=1 mm and h2=2 mm at a frequency of f=1090 MHz was considered. The main advantage of ZST material as a dielectric substrate for patch antennas is the miniaturization of the antennas as well as a high stability with the temperature. For each case we presented the radiation pattern, the efficiency and the input impedance of the patch antennas. The patch antennas were designed using an improved cavity model (a further improved Richards cavity model). The radiation pattern for rectangular array with n = 4, 16, 32 are also presented. The numbers are imposed by the feeding system of the array, which must ensure the same phase for all the patches. A discussion on the suitability of patch antennas with high permittivity substrate is done..

Keywords

High permittivity dielectrics, Patch antennas, Input impedance, Radiation pattern, Antenna array.

Submitted at: Sept. 25, 2007
Accepted at: March 17, 2008

Citation

O. G. AVĂDANEI, A. IOACHIM, P. GASNER, G. N. PASCARIU, V. PASCARIU, A study of patch antennas on ZST substrate, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 3, pp. 639-644 (2008)