Dual-Band Circularly Polarized Transmitarray With Single Linearly Polarized Feed

• Published in: IEEE transactions on antennas and propagation Vol. 68; no. 6; pp. 5015 - 5020
• Main Authors: Cai, Yuan-Ming, Li, Ke, Li, Wenting, Gao, Steven, Yin, Yingzeng, Zhao, Luyu, Hu, Wei
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna feeds; Antennas; Apertures; Circular polarization; Cross polarization; Dual band; dual-band antenna; Frequencies; high gain array; Insertion loss; Linear polarization; Microstrip; Prototypes; Resonant frequency; Resonators; transmitarray (TA) antenna
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2019.2963594

This communication proposes a novel method to design a dual-band circularly polarized (CP) transmitarray (TA) antenna with a linearly polarized (LP) feed. By using this method, a shared-aperture dual-band TA is developed, which forms independent beams with right-hand circular polarization (RHCP) or left-hand circular polarization (LHCP) in two frequency bands with a single LP feed antenna. Four different CP TA prototypes operating at 12 and 14.2 GHz with different senses of CP and different beam directions are designed, and two of the prototypes are fabricated to validate the design concepts. A good agreement is obtained between the radiation patterns, gain curves, polarizations, and cross polarization levels measured and computed in both frequency bands. The proposed single-source dual-band CP TA design has advantages of simple structure, lightweight, easy fabrication, low cost, and high performance, making it a good candidate for varied applications.