A novel folded reflectarray and transmitarray antenna (FRTA), featuring a long distance, no diffraction, high mode purity, and low profile, is proposed to generate high-order Bessel beams carrying orbital angular momentum (OAM). First, two meta-atoms are designed for a full 2π phase coverage and amplitude variation from 0 to 1. Second, metasurfaces are constructed to adjust amplitude and phase independently, with a horn antenna integrated with the upper metasurface as a feeding source. Finally, the FRTA is simulated, fabricated, and measured to verify its generation efficiency of high-order Bessel OAM beams. The full-wave measurement results coincide well with the simulation results and theoretical derivation. The generated beam is more parallel and has a longer non-diffractive distance than conventional Bessel beams. In addition, mode l = 2, 3, 4 achieves approximately 80% mode purity, and more than 65% mode purity is achieved within 12–15 GHz, covering the 21.4% OAM bandwidth. Our study holds promise for applications in radar detection, beam forming, and wireless communications.

This paper presents a novel millimetre‐wave (mmWave) 2D wide‐angle scanning (WAS) phased array antenna (PAA) based on decoupling surface (DS). The proposed element is a coaxial feeding stacked patch antenna structure that consists of an L‐shape coaxial probe, substrate integrated waveguide cavity, slot layer, radiating patch, DS and defective ground structure. The simulated impedance bandwidth for the element is 14.85% (26.18–30.34 GHz). The simulated result of the 2 × 2 array shows that the designed antenna based on DS achieves an isolation of ≥19 dB within the bandwidth. To validate the scanning capabilities of the proposed antenna, an 8 × 8 PAA prototype is fabricated and measured. The measured scanning range of the prototype achieves a 2D WAS range of ±56° at 27 GHz. The proposed antenna shows great potential in application scenarios, such as automotive radar and satellite communication due to its compact design and ability to achieve WAS in two dimensions.

This paper proposes a novel THz band 2-D wide-angle scanning phased-array antenna (PAA) based on a decoupling surface. The simulated S₁₁ bandwidth under periodic boundary conditions is 106–119 GHz, with stable gain within the bandwidth. The designed decoupling surface effectively reduces the coupling between elements, and the simulated active VSWR performance and ground surface current distribution under periodic boundary conditions confirm this. An 8 × 8 (64-element) planar PAA is modeled and simulated in CST2022 to verify the beam-scanning performance of the PAA. According to the simulation results, a 2-D wide-angle scanning of ±48° is achieved in the 106–114 GHz range, while in the 115–119 GHz range, a wide-angle scanning of ±48° is achieved on the E-plane, and the beam-scanning range on the H-plane reaches ±40°. Moreover, the normal peak gain is stably maintained at 21.9–22.8 dBi, with a normalized radiation efficiency as high as 95%, and the scanning radiation efficiency is higher than 81%. Due to its stable gain and 2-D wide-angle scanning performance, the proposed PAA has a broad application prospect in terahertz wireless communication equipment.

In this paper, a new arc‐shaped meta‐atom like a fishbone controlled by Pancharatnam–Berry (PB) phase is designed for a microwave band, which can yield a high‐purity vortex electromagnetic (EM) waves ranged from 10.63 to 26.86 GHz (relative bandwidth of 86.6%) with an efficiency of more than 90%. A single‐beam metasurface with = +1, −2 and +3 modes is designed, respectively. Finally, a prototype with = −2 mode is manufactured in order to prove the feasibility of the designed metasurface. It shows that the experimental results are in good agreement with the ones of the simulation, which verified the excellent performance of the metasurface. The metasurface has a series of edges such as ultra‐broadband, high efficiency, high purity and low profile compared to the conventional metasurfaces, which have strong practical applied value and significance for wireless communication.