A single fed wideband mode‐reconfigurable OAM metasurface CP antenna array with simple feeding scheme

Abstract

In this paper, a low‐profile mode reconfigurable orbital angular momentum (OAM) circular polarization (CP) array antenna is presented, which consists of 2 × 2 elements and a single feed network. Each element is a metasurface subarray composed of 4 × 4 square patchs. The vias in the subarray produces 90° phase difference between x‐ and y‐ polarizations, and CP is realized. Both the 90° phase‐shifting reconfigurable feed network and broadband 180° phase shift by the mirror images are used to generate the OAM helical phase. The OAM modes l can be dynamically switched between l = +1 and l = −1 by controlling operation states of p‐i‐n diodes in the feed network. The CP and OAM impedance bandwidths are 13.3% (from 5.8 to 6.6 GHz). The peak gains for the two modes are 9.4 dBi. The developed array antenna has the following advantages of the least pin diode number, high gain, small size, lowest divergence angle, wideband CP, low cross‐polarization and low fabrication cost. Therefore, the proposed antenna is very promising for modern high‐speed and large capacity wireless communication systems.

An orbital angular momentum vortex wave antenna with low in‐band radar cross section and reduced divergence angle

“…Quite recently, a unique electromagnetic wave carrying orbital angular momentum (OAM), which is called OAM vortex wave, has attracted a lot of interests. [1][2][3][4] Different from the plane wave or spherical wave, the OAM vortex wave owns helical wave front. The structure of the wave front is denoted by topological charge l and the phase variation in a circle around the beam axis equals to 2πl.…”

Converged OAM vortex wave generation using EBG‐loaded patch array antenna

“…It is worth mentioning that the metamaterial technique paves a new way to generate OAM radio vortex wave. [19][20][21][22][23][24] Due to its flexible manipulation ability on EM waves, metamaterial can be used to realize OAM waves with various performances, such as multiple beams, 6,25 reconfigurable modes, 26 dual-mode, and dual-polarization. 27 In fact, the metamaterial can do much more in improving the radiation performance of the OAM vortex waves.…”

Broadband and high‐aperture‐efficiency metasurface antenna using multi‐mode radiator

“…The above methods have been proved to be effective. In recent years, high‐gain metasurface antennas have attracted extensive public attention 16–23 . In Reference 20, a high‐gain antenna driven by a coupling hole has been proposed.…”