Metasurface-Based Single-Layer Wideband Circularly Polarized MIMO Antenna for 5G Millimeter-Wave Systems

Abstract

This paper presents a metasurface-based single-layer low-profile circularly polarized (CP) antenna with the wideband operation and its multiple-input multiple-output (MIMO) configuration for fifth-generation (5G) communication systems. The antenna consists of a truncated corner patch and a metasurface (MS) of a 2 × 2 periodic square metallic plates. The distinguishing feature of this design is that all the radiating elements (radiator and MS) are printed on the single-layer of the dielectric substrate, which ensures the low-profile and low-cost features of the antenna while maintaining high gain and wideband characteristics. The wideband CP radiations are realized by exploiting surface-waves along the MS and its radiation mechanism is explained in detail. The single-layer antenna geometry has an overall compact size of 1.0λ0 × 1.0λ0 × 0.04λ0. Simulated and measured results show that the single-layer metasurface antenna has a wide 10 dB impedance bandwidth of 23.4 % (24.5-31 GHz) (23.4 %) and overlapping 3-dB axial ratio bandwidth of 16.8 % (25-29.6 GHz). The antenna also offers stable radiation patterns with a high radiation efficiency (>95%) and a flat gain of 11 dBic. Moreover, a 4-port (2 × 2) MIMO antenna is designed using the proposed design by placing each element perpendicular to each other. Without a dedicated decoupling structure, the MIMO antenna shows an excellent diversity performance in terms of isolation between antenna elements, envelope correlation coefficient, and channel capacity loss. Most importantly, the operational bandwidth of the antenna covers the millimeter-wave (mm-wave) band (25-29.5 GHz) assigned for 5G communication. These features of the proposed antenna system make it a suitable candidate for 5G smart devices and sensors.

Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins

“…The surface waves propagating on the metasurface generate additional resonances. These additional resonances are utilized effectively to increase bandwidth and gain, which have been thoroughly investigated in [20,24,26,27].…”

“…Recently, metasurface (MTS) has been intensively studied and utilized to improve the performance of microstrip patch antennas, especially bandwidth and gain [20]- [24]. The antenna in [20], is designed for 5G mm-wave applications, and to achieve the performance enhancements both the patch radiator and the periodic metallic plate metasurface are printed on the same dielectric layer. In [22]- [24], doublelayered metasurface-based antennas for performance improvements especially in terms of gain and bandwidth are presented.…”

Infinity Shell Shaped MIMO Antenna Array for mm-Wave 5G Applications

“…Although a huge bandwidth is achieved by the proposed MIMO design, the size of it is observed to be quite large. Similarly, a circular, polarized MIMO antenna with four ports is presented in [17]. An antenna element is placed within a center of a large number of parasitic elements to improve the radiation characteristics; however, the complexity of the proposed MIMO design is increased due to the use of parasitic elements.…”

Nature Inspired MIMO Antenna System for Future mmWave Technologies

“…To operate efficiently in these frequency bands, the antenna needs to possess high gain and bandwidth or Multiple Input Multiple Output (MIMO) features [14,15]. In the literature [16][17][18][19][20][21][22][23][24][25], several antennas have been reported for mmWave applications. Reference [17] reported a circular polarized MIMO antenna with four ports.…”

“…In the literature [16][17][18][19][20][21][22][23][24][25], several antennas have been reported for mmWave applications. Reference [17] reported a circular polarized MIMO antenna with four ports. The metamaterial surface is surrounded by the antenna elements to achieve better radiation characteristics, but the use of parasitic elements makes the MIMO design complex.…”