Modern 4G and 5G systems use MIMO—multiple input, multiple output—to send and receive through more than one radio path. Two antennas are common for 2x2 MIMO, while higher-performance 5G routers may use four for 4x4 MIMO. The separate paths improve capacity and reliability when the network and radio environment support them.
Leaving ports disconnected, combining them incorrectly or placing all antennas in an unsuitable arrangement can reduce performance. Use antennas that cover the required bands and follow the model’s connection and spacing guidance. On a dual-SIM router, the SIM count does not necessarily equal the antenna count; the modem architecture determines the connections.
Public Q&A
Why do many 4G and 5G routers require two or four cellular antenna connections?
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