Quad-Port Circularly Polarized MIMO Antenna with Wide Axial Ratio

Abstract

This article studies a quad-port multi-input-multi-output (MIMO) circularly polarized antenna with good isolation properties. Using characteristic mode analysis (CMA), the first six distinct modes of the asymmetric square slot with an inverted L-strip are analyzed. In this study, modal parameter extraction is carried out for circular polarization (CP) radiation. A simple annular ring microstrip feed is excited to obtain broadband CP based on CMA. The single-unit feeding structure is replicated orthogonally four times to achieve a CP MIMO antenna. This antenna provides port isolation of more than 21 dB without the use of an additional decoupling element. The quad-port CP-MIMO antenna is simulated with a total dimension of 50 × 50 mm2. The antenna attains impedance matching (S11 < −10 dB) from 5.37 GHz to beyond 11 GHz with an axial ratio bandwidth (ARBW) of 4.65 GHz (5.61 GHz to 10.26 GHz). The peak realized gain of the MIMO antenna is measured at 5.69 dBi at 8.4 GHz. Additionally, the diversity performance parameters of the MIMO structure are computed. The advantages of the proposed structure have been evaluated by comparing it to previously reported MIMO structures. A prototype of the MIMO structure measurements was found to match the simulation results.

Advances in MIMO Antenna Design for 5G: A Comprehensive Review

“…The antenna achieved 8.5 to 12.5 GHz impedance bandwidth with axial ratio bandwidth of 9.2 to 10.1 GHz with a gain of 6 dBi. The study [ 83 ] introduced a quad-port MIMO circularly polarized patch antenna that used characteristic mode analysis (CMA) and annular ring microstrip feeding to achieve broadband circular polarization. The antenna had isolation greater than 21 dB among ports without decoupling structure.…”

Teaching and Learning Optimization method for multi- channel wireless mesh networks with MIMO links

“…Various routing, channel assignment, capacity and scheduling algorithms [1][2][3][4][5][6] have been proposed for non-MIMO WMNs, but those conventional algorithms did not consider the effects of multiple antennas and could not leverage the benefits, brought by MIMO in wireless mesh networks. MIMO has been widely studied for single point-to-point link or point-to-multipoint transmission scenarios [1][2][3][4][5][6][7][8][9][10][11][12], where the main focus is on physical and MAC layer. As far as we know, research on multichannel MIMO WMNs is very limited and only few results are available [8,9].…”

“…Compact Quad Band MIMO Antenna Design with Enhanced Gain for Wireless Communications was proposed in [9]. Combining stochastic geometry and statistical mechanics for the analysis and design of mesh networks [10] , Quad-Port Circularly Polarized MIMO Antenna with Wide Axial Ratio [11] and Multicast with cooperative gateways [12] in multichannel have proposed in wireless networks. In Leili Farzinvash and Mehdi Dehghan [13] proposed an algorithm namely Multi-Gateway Multi-Rate multicast routing (MGMR), aims at maximizing the total of achieved data rates by the receivers while preserving fairness between them.…”

“…Alamouti Space-Time Block Coding STBC is a complex space-time diversity technique that can be used in 2x1 MISO mode or in a 2x2 MIMO mode. It is the only STBC that can achieve its full diversity gain without needing to sacrifice its data rate [11]. STBC (Space Time Block Coding) is a MIMO technique which transmit multiple copies of the same data symbol across multiple antennas and exploit the various received versions to derive (or decode) the transmitted data efficiently without any errors.…”

Pentaband Dual-Polarized Antenna for Multiservice Wireless Applications

“…As the demand for wireless communication continues to grow, there has been a significant increase in the development of multiband MIMO antenna concepts for existing wireless systems in recent years [9,10]. However, designing MIMO antennas presents a primary challenge of reducing the coupling between adjacent antenna elements [11].…”