Which is the only 802.11 series of standards that operates at 900 MHz for reliable connectivity with Internet of Things (IoT) sensors?

The series of standards operating at 900 MHz specifically designed for reliable connectivity with Internet of Things (IoT) sensors is 802.11ah. This standard, often referred to as Wi-Fi HaLow, is tailored for low-power, long-range communications, making it well-suited for applications in IoT environments where devices may need to communicate over extended distances without consuming substantial energy.

Unlike other standards such as 802.11a, 802.11b, and 802.11ac, which operate at higher frequencies (5 GHz and 2.4 GHz), 802.11ah leverages the sub-1 GHz band, allowing for greater penetration through obstacles and a wider coverage area. This is particularly beneficial for smart home devices, agricultural sensors, and industrial applications where reliable, long-range connectivity is critical. The design of 802.11ah supports a high number of devices with minimal energy consumption, aligning with the needs of the rapidly growing IoT sector.