Massive 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 largescale antenna array for base stations naturally becomes the key to deploy the Massive MIMO technologies. In this paper, we present a dual-polarized antenna array with 144 ports for Massive MIMO operating at 3.7GHz. The proposed array consists of 18 low profile sub-arrays. Each sub-array consists of 4 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.

No abstract

No abstract

A wideband slot antenna with frequency-and pattern-reconfigurable characteristics for TD-LTE (3.4-3.8 GHz) and C-band (3.7-4.2 GHz) applications is proposed. The antenna consists of two symmetric slots that are fed by a fork-shaped microstrip line. Two PIN diodes are loaded in the slots to produce two different frequency bands. Meanwhile, two additional PIN diodes are inserted in the feed line to achieve the pattern reconfigurability. The wideband operation is realized by using the symmetric slots and fork-shaped feed line. Simulated and measured results show that the antenna provides 25°and 20°beam-steering in 3.4-3.8 and 3.7-4.2 GHz bands, respectively. Also, an impedance bandwidth of at least 12.8% is obtained in the operating bands.

No abstract