Transmitarray Design With Enhanced Aperture Efficiency Using Small Frequency Selective Surface Cells and Discrete Jones Matrix Analysis

A wideband and low‐profile transmitarray antenna using different types of unit‐cells

“…It is worth pointing out that there are various efforts made to deal with the large‐phase shift range issues of the transmitarray antenna. A popular way is to using multiple layers structure and use air gaps (generally more than a quarter wavelength) to prevent mutual coupling . However, air gaps will increase the thickness and the complexity of the overall structure and bring many random errors.…”

“…And, as the gain requirements gradually increase to more than 30 dBi, the multiplied feed network will have great losses, especially in the millimeter wave frequency bands (30‐300 GHz) which can achieve more capacity compared to the current wireless networks . The planar transmission array antenna composed of the metal resonance unit‐cells has received increasing research interest due to its advantages of light weight, ease of installation, and low cost . Although planar transmitarray antennas have many advantages over conventional array antennas and lens antennas, they are generally narrowband due to the resonant effects of metallic structures.…”

“…Although planar transmitarray antennas have many advantages over conventional array antennas and lens antennas, they are generally narrowband due to the resonant effects of metallic structures. Recently, efforts are made to improve the bandwidth of transmitarray (more than 10% of the gain bandwidth) . Several methods reported to improve the bandwidth of transmitarray.…”

Low‐profile transmitarray lens antenna of X‐band with one layer of substrate and metallic vias

“…The main reason is that the proposed transmitarray element has big period of 20 mm (0.67 wavelengths) due to utilisation of substrate with low relative permittivity. The size of the unit cell can severely affect the performance of aperture efficiency [6]. As a result, seeking for the transmit element which owns both small period size and ultra‐thin thickness is crucial and need to be studied further.…”

Design and Measurements of a High-Performance Wideband Transmitarray Antenna for D-Band Communications

“…A TA using a dual-polarized element with Jerusalem cross slot is introduced at W-band in [16], but no experimental demonstration is provided in this work. In [17] a TA with four metal layers and three air gaps was studied, with a 1-dB gain bandwidth of 12.6% at 11.7 GHz, nevertheless this concept of the stacked layers configuration is not suitable for Dband communications due to its manufacturing and assembly complexity. Moreover, a dual-polarized TA with a 1-dB gain bandwidth of 16% and a cross-polarization level of -22 dB was described in [18], but this TA configuration also suffers from a complex architecture characterized by a pair of tri-layer frequency selective surfaces separated by a quarter-wavelength air gap.…”