Etude et conception d’antennes à résonateurs diélectriques

Abstract

This work consists of a contribution to the modeling and the conception of dielectric resonator antennas with application to the realization of reconfigurable antenna. The dielectric resonator antennas are important antenna for the flexibility and the ease of integration in wireless systems (WLAN), where they allow to use several shapes (rectangular, triangular,etc) and several power supplies (coupling slot, coaxial cable,etc.). We are also interested by the coupling effect due to the presence of another antenna or a presence of a coupling slot. The calculated program based on the FDTD method to modeling a dielectric resonator antenna, we enable to calculate the reflection coefficient, the input impedance electrical and the magnetic fields. The HFSS simulator is used to validate these results. Then, this study has been extended to the conception and the fabrication of a reconfigurable dielectric resonator antenna. For this purpose, we studied and simulated a reconfigurable antenna structure by using two simulator (HFSS, CST), then we proposed another structure which is a triangular reconfigurable dielectric resonator antenna simulated by CST simulator and fabricated in RF laboratory, of the National Institute of Scientific Research, INRS, Canada. The numerical results are presented in terms of the reflection coefficient, radiation pattern, gain, and efficiency. In addition, we have studied an dielectric resonator antenna with reconfigurable by diodes PIN. Two distinct radiation patterns were obtained by maintaining the same resonance frequency, which shows that the insertion of electrically-driven semiconductor components into the antenna base structure provides an effective means for reconfigurability of the radiation