In this letter, a novel slot-coupling feeding technique has been adopted to realize a circularly polarized (CP) 2X2 microstrip array. Each array element is fed through two microstrip lines that are excited 90 out of phase (dual-feed technique) and coupled to a square patch by means of a square-ring slot realized in the feeding network ground plane. Design procedure, simulation results, and measurement data are presented for a 2X2 array working in the WiMax 3.3–3.8 GHz frequency band (14%percentage bandwidth). Due to both the symmetry properties of the novel slot-coupling feeding configuration and the implementation of a sequential rotation technique, excellent axial ratio (AR) performance is achieved in the WiMax band (AR>1.35dB at broadside) and for any direction in the antenna main beam (AR<2.25dB at 3.55 GHz). Actually, the 3-dB AR bandwidth is larger than the WiMax frequency band, as it goes up to about 30%.
|Autori:||R. CASO; A. BUFFI; M.R. PINO; NEPA P; G. MANARA|
|Titolo:||A novel dual-feed slot-coupling feeding technique for circularly polarized patch arrays|
|Anno del prodotto:||2010|
|Digital Object Identifier (DOI):||10.1109/LAWP.2010.2044864|
|Appare nelle tipologie:||1.1 Articolo in rivista|