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802.11n is a Wi-Fi standard from 2009, also known as Wi-Fi 4, that significantly increased wireless network speed and range over its predecessors. It introduced MIMO (Multiple Input Multiple Output) technology, which uses multiple antennas to send and receive data simultaneously, and can operate on both the 2.4 GHz and 5 GHz frequency bands, offering speeds up to 600 Mbps.

Key features

Speed: Theoretical maximum data rates can be up to 600 Mbps, a substantial improvement over earlier standards like 802.11g.

Frequency bands: It uses both the 2.4 GHz and 5 GHz bands, which allows for backward compatibility with older devices and the ability to choose between faster (5 GHz) and longer-range (2.4 GHz) signals.

MIMO (Multiple Input Multiple Output): This technology uses multiple antennas on both the sender and receiver to increase data throughput and signal reliability by sending multiple spatial streams at once.

Range: The use of MIMO technology and its ability to operate on the 2.4 GHz band (which has better penetration through walls) results in an increased wireless signal range compared to older standards.

Backwards compatibility: 802.11n is backward compatible with earlier standards like 802.11a/b/g, though speeds will be limited to the fastest common standard during communication.

Bandwidth: It supports both 20 MHz and 40 MHz channel bandwidths.