Abstract
Massive multiple input and multiple output (MIMO) has attracted significant interests in both academia and industry. It has been considered as one of most promising technologies for 5G wireless systems. The large-scale antenna array for base stations naturally becomes the key to deploy the Massive MIMO technologies. In this communication, we present a dual-polarized antenna array with 144 ports for Massive MIMO operating at 3.7 GHz. The proposed array consists of 18 low profile subarrays. Each subarray consists of four single units. Each single antenna unit consists of one vertically polarized port and one horizontally polarized port connected to power splitters, which serve as a feeding network. A stacked patch design is used to construct the single unit with the feeding network, which gives higher gain and lower mutual coupling within the size of a conversional dual-port patch antenna. Simulation results of the proposed single antenna unit, sub-array, and Massive MIMO array are verified by measurement.
Highlights
Multiple-Input and Multiple-Output (MIMO) has been a very important technique for wireless communications, such as 3G, 4G, WiFi, etc
Driven by the development of 5G wireless systems, Massive MIMO recently has attracted significant interests in both academia and industry as it has shown over 10 times the spectral efficiency increase than a conventional MIMO under realistic propagation environment conditions and simpler signal processing algorithms [5] [6]
With over 100 antenna ports to be implemented at the base station, Massive MIMO has brought significant challenges
Summary
Multiple-Input and Multiple-Output (MIMO) has been a very important technique for wireless communications, such as 3G, 4G, WiFi, etc. An active multibeam antenna system for 5G Massive MIMO wireless system was designed and implemented in [7], which contained 64 RF Channels and 64 elements array being divided between 8 PCBs. The dimension of each individual PCB was 320mm × 215mm (6λ × 4λ, where λ is the wavelength in free space). A low profile stacked patch antenna unit is designed with four apertures through four coupling strips to excite four patches with the dual-polarization. Each aperture transfers the input power to its crossed coupling strip without any via, and each coupling strip excites two patches.The proposed antenna unit is designed as a symmetric layout in layers except the feeding network at the bottom layer, resulting in advantages such as simple structure and low mutual coupling between the two orthogonal polarization modes. Measurement shows that the mutual coupling between any two ports in the array is lower than -35dB
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