A feed network system for massive mimo antennas

Abstract

The invention discloses a feed network used for large-scale MIMO antennas. The feed network comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, wherein a strip line circuit is arranged between the first dielectric substrate and the second dielectric substrate, and a microstrip line circuit is arranged on the surface, away from the second dielectric substrate, of the third dielectric substrate; the microstrip line circuit comprises a first power divider circuit, a second power divider circuit, a first filter and a second filter, and the stripline circuit comprises a first directional coupler and a second directional coupler; the output end of the first directional coupler communicates with the input end of the first power divider circuit,and the output end of the second directional coupler communicates with the input end of the second power divider circuit; the first filter is connected between the input end of the first power divider circuit and the output end of the first power divider circuit, and the second filter is connected between the input end of the second power divider circuit and the output end of the second power divider circuit. Through the mode of execution, the feed network is high in integration level, light in weight and small in size, and is applicable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of mobile communication base stations, in particular to a feeding network system for massive MIMO antennas. Background technique [0002] The distributed base station antenna is a passive antenna, which uses a cable to connect the Remote Radio Unit (RRU) to the antenna. The RRU includes a duplexer, a transmit / receive filter, a low noise amplifier, a power amplifier, and a multimode Passive modules and active modules such as multi-frequency RF modules and digital intermediate frequency. [0003] The development trend of 4.5G and 5G mobile base stations is to use massive MIMO active antennas. Active antennas organically combine the entire RRU and antennas, that is, the radio frequency units use a large number of distributed radio frequency chips to integrate inside the antenna. In terms of performance, the traditional base station has a fixed downtilt angle, while the active antenna base station can realize f...

AI Technical Summary

Problems solved by technology

At present, the filters used in RRU mainly include coaxial line filters and air cavity filters. This type of filter is large in size and heavy in weight, and it is difficult to achieve an integrated design with the antenna.

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