A Wideband Dual-Cavity-Backed Circularly Polarized Crossed Dipole Antenna

• Published in: IEEE antennas and wireless propagation letters Vol. 16; pp. 3135 - 3138
• Main Authors: Nguyen, Truong Khang, Tran, Huy Hung, Nguyen-Trong, Nghia
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antenna radiation patterns; Antennas; Apertures; Broadband; Broadband antennas; Cavity antenna; Cavity resonators; Circular polarization; circularly polarized (CP); crossed dipole; Dipole antennas; Dipoles; dual-cavity; Radiators; Wideband
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2017.2764923

A novel wideband dual-cavity-backed circularly polarized (CP) crossed dipole antenna is presented in this letter. The exciter of the antenna comprises two classical orthogonal straight dipoles for a simple design. Dual-cavity structure is employed to achieve unidirectional radiation and improve the broadside gain. In particular, the rim edges of the cavity act as secondary radiators, which contribute to significantly enhance the overall CP performance of the antenna. The final design with an overall size of 0.57λ o × 0.57λ o × 0.24λ o where λ o is the free-space wavelength at the lowest CP operating frequency of 2.0 GHzb yields a measured -10 dB impedance bandwidth (BW) of 79.4% and 3 dB axial-ratio BW of 66.7%. The proposed antenna exhibits right-handed circular polarization with a maximum broadside gain of about 9.7 dBic.