What is Sub-GHz wireless communication?
Introduction
“How far is the transmission distance?” is the question that haunts all those interested in wireless transmission technology. To build a wireless network to suit these requirements, most developers will have to choose between two ISM (1) band options at 2.4GHz or below. To determine whether a wireless network uses 2.4GHz or less than 1GHz, the user can rely on the following criteria: data transmission range, energy consumption, data transmission rate, antenna size, interoperability… Wi-Fi®, Bluetooth® Smart, and ZigBee® technologies are 2.4GHz protocols widely used in today’s wireless communication applications.
However, for applications that only require a low data transmission rate, such as smart agriculture, smart home, smart meter, etc., the Sub-GHz wireless system gives us many advantages, including a longer range, lower energy consumption, and lower deployment and operating costs. To learn more about Sub-GHz wireless communications, please read the next sections of the article.
(1) ISM stands for Industrial, Scientific and Medical, is a term used to refer to equipment, applications, and frequency bands… used in industrial environments., science and medicine.
Sub-Ghz technology characteristics
Wireless communication is the method of transmitting data in space using electromagnetic waves such as radio waves, infrared waves… When deploying IoT applications, the wireless technology of 2.4GHz and wireless Sub-GHz is mainly used.
Sub-GHz is named based on its operating frequency band (Sub-GHz technology operates in a frequency band less than 1GHz, usually around 920MHz). Sub-GHz is an ideal technology choice for wireless applications requiring long-range and low power consumption. The long-range transmission reduces the cost of locating intermediate base stations.
Countries around the world mainly use the 433MHz licensed free spectrum. However, a few other bands are used in some regions: North America and Australia 915MHz, Europe 868MHz, China 470MHz, and 779MHz, Japan 426MHz and 920MHz.
Free ISM Sub-GHz band in the world (Source: TI.com)
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