Single-fed high-gain circularly polarized slotted cavity antenna using TE330 mode

In this paper, a novel single-fed high-gain circularly polarized slotted cavity antenna using TE₃₃₀ mode based on substrate integrated waveguide (SIW) technology is proposed. The proposed antenna consists of two parts, i.e. the radiating linearly polarized slotted cavity antenna and a linear-to-circular polarization converter. An antenna prototype operating at WLAN 5.8 GHz band fabricated with low-cost standard printed circuit board (PCB) process is exemplified to validate the proposed concept. The overall volume of the antenna is 1.68λ₀ × 1.68λ₀ × 0.17λ₀. Within the WLAN 5.8 GHz bandwidth, the measured boresight gain is larger than 13.5 dBic, and the measured boresight axial-ratio is smaller than 1.7 dB, indicating a good circularly polarized characteristic. The proposed antenna features low profile, high gain, ease of fabrication and high efficiency.