A Wideband Low-Profile Reconfigurable Transmitarray Using Magnetoelectric Dipole Elements

作者：Dai, Xin^*; Wu, Geng-Bo; Luk, Kwai-Man

来源：IEEE Transactions on Antennas and Propagation, 2022, 70(9): 8008-8019.

DOI：10.1109/TAP.2022.3164185

• Beam scanning
• low profile
• magnetoelectric (ME) dipole
• reconfigurable
• transmitarray
• wideband

A wideband 1 bit reconfigurable transmitarray antenna (RTA) with low-profile characteristic is presented. First, a wideband element for the RTA is designed by combining two centrally fed magnetoelectric (ME) dipoles. Two p-i-n diodes are integrated within the element to achieve 1 bit reconfigurable phase states. Next, the folded scheme is adopted to achieve multiple reflections between the feed source and the RTA, and thus, the height-to-diameter ratio (H/D) is reduced to about one-third of that of the conventional transmitarray. A reflective surface with polarization conversion function is designed beneath the RTA around the source, the unit cell of which is a special C-shaped polarizer operating over a wide frequency band. Finally, a low-profile RTA with 12 x 12 elements is designed, fabricated, and measured. The whole structure has an aperture size of 5.75 lambda(0) x 5.75 lambda(0), and H/D is 0.28. Measured results show that the proposed RTA has the beam-scanning capability to +/- 40 degrees in both E- and H-planes over a bandwidth of 32%. The realized gain is up to 19 dBi and the peak aperture efficiency is 20.5%.

• 单位
  广州大学