Cross Slot Coupled Elliptical Patch Antenna Circularly Polarized for Localization

Anthony Ghiotto (1) , Mathieu Bourry (2) , Ke Wu (2)

1 LCIS - Laboratoire de Conception et d'Intégration des Systèmes
2 Polygram

This paper reports a circularly polarized cross-slot coupled elliptical patch antenna for implementation in a new radio-frequency identification and localization system currently under development. The radio-frequency localization system in this work is composed of a reader and a semiactive tag (a battery feeds the tag to increase its reading range but the backscattering modulation principle is used to decrease its power consumption). The overall system is designed in the ISM frequency band of 5.8 GHz. This frequency band is a good compromise that permits a large bandwidth and a good range for use in a local positioning system (10 m). This antenna is to be used by the reader as its radiation pattern is semispherical. It provides the circular polarization required by the targeted application to allow the tag identification within any physical position. The antenna bandwidth and axial ratio were enhanced using a proper design and a cross-slot feeding of the patch.

Domaines: Electronique

Anthony Ghiotto, Mathieu Bourry, Ke Wu. Cross Slot Coupled Elliptical Patch Antenna Circularly Polarized for Localization. Microwave and Optical Technology Letters, 2007, 49 (2), pp.336-339. ⟨10.1002/mop.22136⟩. ⟨hal-00260026⟩