A Dual-Band Dual-Pin Circularly Polarized Antenna for 2.45 GHz and 5.2 GHz WiFi Operation

This paper presents the development and characterization of a dual band antenna optimized for operation at 2.45 GHz at 5.2 GHz in Circular Polarization, hence suitable for WiFi communication in the S and C bands according to the IEEE 802.11/n protocol. The antenna is composed of two disc-based patches arranged in a concentric single-layer structure. The CP operation is enabled by the degeneration principle applied to the TM₁₁ mode of either the internal and external disc. Each operative frequency is controlled with an independent coaxial connector, to ensure the maximum flexibility.