Abstract
This paper presents the design and the realization of broadband circularly polarized (CP) Fabry-Perot resonant antenna using a single superstrate for the fifth-generation (5G) wireless multiple-input-multiple-output (MIMO) applications. The antenna consists of a corner cut patch with a diagonal slot and a superstrate. The individual resonances of the corner cut patch and patch with diagonal slot are overlapped to improve the intrinsic narrow impedance and axial ratio (AR) bandwidths of the single-fed patch antennas. A half-wavelength spaced superstrate having a half-wavelength thickness is employed as a partially reflecting surface (PRS) for high gain and wide AR as well as impedance bandwidths. The design procedure and mechanisms of the PRS are discussed in detail through the equivalent circuit and ray tracing analysis. Simulated and measured results show that the proposed antennas have a wide operational bandwidth of 25-33 GHz (27.6%) for |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | <; -10 dB with a stable gain achieving a maximum value of 14.1 dBiC and a wide 3-dB AR bandwidth ranging from 26-31.3 GHz (17%). This operational bandwidth of the antenna covers the proposed entire global 5G millimeter wave (mmWave) spectrum (26-29.5 GHz). Moreover, a 2 × 2 MIMO antenna is designed using the proposed antenna in such a way that the polarization diversity of the adjacent radiator is exploited, resulting in high isolation between antenna elements and low-envelope correlation coefficient, which makes it a suitable candidate for future 5G MIMO applications.
Highlights
The congestion, limited bandwidth, and restricted channel capacity of the current wireless system have pushed researchers and engineers to utilize an unused millimeter wave spectrum in the fifth-generation (5G) of wireless communication systems [1]
Starting from these considerations, the design of a broadband circularly polarized antenna with MIMO capabilities based on a Fabry-Perot resonant cavity at millimeter wave (mmWave) 5G frequency bands is proposed in this paper
A high-gain and broadband circularly polarized (CP) Fabry-Perot resonant antenna utilizing a single-layered partially reflecting surface (PRS) is presented for 5G MIMO applications
Summary
The congestion, limited bandwidth, and restricted channel capacity of the current wireless system have pushed researchers and engineers to utilize an unused millimeter wave (mmWave) spectrum in the fifth-generation (5G) of wireless communication systems [1]. Designing of a compact, low-cost, high gain, and circularly polarized MIMO antenna with broadband operation covering the whole allocated mmWave spectrum (25GHz – 29.5 GHz) for future 5G systems would be an important step on the road in the realization of 5G wireless systems Starting from these considerations, the design of a broadband circularly polarized antenna with MIMO capabilities based on a Fabry-Perot resonant cavity at mmWave 5G frequency bands is proposed in this paper. A high gain and wideband FP cavity is designed by using single-layered PRS with a half-wavelength thickness for the antenna design at 5G mmWave frequencies. This discrepancy is most likely due to cable losses and fabrication tolerances These wideband characteristics are associated with the overlapping of the slot and truncated patch resonances and successful implementation of the well-designed single-layered PRS. It can be clearly observed that the radiated field from the radiator rotates in a counter-clockwise direction, verifying the antenna has RHCP
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