Holographic Transmitarray Antenna with linear Polarization in X band

TL;DR

This paper introduces a novel holographic transmitarray antenna design based on electromagnetic wave recording and reconstruction, demonstrating effective multi-beam and wideband operation at 12 GHz with high gain and efficiency.

Contribution

It is the first to apply holographic theory to design transmitarray antennas without iterative optimization, using transmission metasurfaces for beam control at X band.

Findings

Achieved 12.5% bandwidth with 1-dB gain variation

Maximum gain of 23.8 dB demonstrated

Antenna exhibits 21.46% aperture efficiency

Abstract

In this paper, we present the design and demonstration of transmitarray antennas (TAs) based on the holographic technique for the first time. According to the holographic theory, the amplitudes and phases of electromagnetic waves can be recorded on a surface, and then they can be reconstructed independently. This concept is used to design single-beam and multi-beam linearly polarized holographic TAs without using any iterative optimization algorithms. Initially, a transmission impedance surface is analyzed and compared with the reflection one. Then, interferograms associated with the scalar admittance distribution are defined according to the number and direction of the radiation beams. After that, a transmission metasurface of dimensions equal to 0:26l0 is hired to design holographic TAs at 12 GHz. Several examples are provided to support the method. In the end, a linearly polarized circular aperture wideband holographic transmitarray antenna with a radius of 13.3 cm has been manufactured and tested. The antenna achieves 12.5% (11.4-12.9 GHz) 1-dB gain bandwidth and 23.8 dB maximum gain, leading to 21.46% aperture efficiency.