Skip to Main content Skip to Navigation
Theses

Modélisation et conception de nouvelles cellules élémentaires et sources primaires pour réseaux réflecteurs en bande millimétrique

Abstract : These last years, LEAT worked on systems radars of help for the detection of cables of high voltage (security in theft for helicopters) in millimetre band. Traditionally, the used antennas are parabolic reflectors giving of very good performances but costly. A less expensive alternative in circuit printed was developed these last years: reflectarrays. We develop a program of modelling allowing to acquire fast a good approximation of the radiation pattern of reflectors antennas. This tool allows to simulate and to envisage the behavior of the large reflectors contrary to the commercial software which require important computer means. High gain antennas are often used to perform beam scanning. In that case, it is important to minimize the first side-lobes. The solution which we offered consists in developing a primary source having a diagram which allows concentrating 99 % of energy in the lobe main of the diagram and so allow reducing strongly the side-lobe level in comparison with sources traditionally used (reduction of about 15 dB). To improve the performances of reflectarrays in term of gain and beam scanning, we used a reduced size of cells giving so a better phase correction. For small size reflectors, an improvement of 3 dB on gain is observed and a gain loss of 1 dB versus 3 dB for a beam scanning of 60° with classical cells.
Document type :
Theses
Complete list of metadatas

Cited literature [63 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00526989
Contributor : Sophie Gaffé-Clément <>
Submitted on : Sunday, October 17, 2010 - 6:40:54 PM
Last modification on : Monday, October 12, 2020 - 10:27:28 AM

Identifiers

  • HAL Id : tel-00526989, version 1

Collections

Citation

Jérôme Lanteri. Modélisation et conception de nouvelles cellules élémentaires et sources primaires pour réseaux réflecteurs en bande millimétrique. Sciences de l'ingénieur [physics]. Université Nice Sophia Antipolis, 2007. Français. ⟨tel-00526989⟩

Share

Metrics

Record views

345

Files downloads

3672