Wideband Transmitarrays Based on Polarization- Rotating Miniaturized-Element Frequency Selective Surfaces

A wideband transmitarray antenna based on the substrate integrated waveguide polarization twister

“…Obviously, the proposed transmitarray has widest 3‐dB gain bandwidth. Its number of layers is minimum, compared with the transmitarray antennas in References 3,8,9,13. Although the proposed transmitarray has the same number of layers with the transmitarray antenna in Reference 14, its 3‐dB gain bandwidth is much wider.…”

“…In Reference 12, a broadband polarization‐rotating unit cell was proposed to design a wideband transmitarray with 71% 3‐dB gain bandwidth, by introducing some optimization techniques. In Reference 13, a wideband transmitarray based on polarization rotating miniaturized‐element FSSs with 1‐bit phase quantization was presented, and its measured 3‐dB gain bandwidth is 33.4%. Although the above two types of transmitarrays have wider bandwidths, their profiles are relatively higher, and their structures are more complex.…”

“…Although bandwidths of this type of transmitarrays are improved, complex structures of these M-FSS elements increase their assemble difficulties, weights and costs. In the second design category, [11][12][13] wideband polarization rotating elements with 1-bit phase quantization were proposed to realize the wider bandwidth performance. In Reference 12, a broadband polarization-rotating unit cell was proposed to design a wideband transmitarray with 71% 3-dB gain bandwidth, by introducing some optimization techniques.…”

“…[15][16][17] To further reduce the profile without affecting the bandwidth performance, in this paper, a novel double-layer wideband transmitarray antenna based on the SIW polarization twister is proposed. Different from the previous polarization rotating elements, [11][12][13] the proposed element based on the SIW polarization twister includes only single substrate layer sandwiched with two metal layers, which provides 0 and 180 phase shifts with 1-bit phase quantization. Moreover, with the same number of metallic layers compared with the element in Reference 14, this novel SIW element can provide wider operating bandwidth.…”

Wideband Low-Profile Ku-Band Transmitarray Antenna

“…Recent studies have proposed many approaches to expand the operating frequency band of transmitarray antenna, which can be divided into the following three ways. The first and most popular approach is the multilayer frequency selective surface (M-FSS) [4][5][6][7][8][9][10][11][12]. The TA units at different positions of the transmitarray have the same structure shape, but different sizes, which are calculated according to the phase compensation of the units at that position.…”