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%.

A novel dual-feed slot-coupling feeding technique for circularly polarized patch arrays

CASO, ROBERTO;BUFFI, ALICE;NEPA, PAOLO;MANARA, GIULIANO
2010-01-01

Abstract

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%.
Caso, Roberto; Buffi, Alice; M. R., Pino; Nepa, Paolo; Manara, Giuliano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/141694
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