A wireless module is an electronic component designed to enable wireless communication functions. As the core component of IoT devices, wireless modules enable objects to network and exchange information for intelligent operation and management.
The three frequency bands of 433MHz, 900MHz and 2.4GHz are commonly used in wireless communication technology, and today we will introduce the characteristics of wireless modules in these three frequency bands. In addition, it should be noted that the working frequency bands of 433MHz and 2.4GHz wireless modules are both license-free ISM open frequency bands in China, so they are widely used.
433MHz wireless module
The 433MHz band wireless module is located in the ultra-high frequency (UHF) range, and the specific frequency range is 433.05~434.79MHz. Radio waves in this frequency band have a longer wavelength and better penetration, as well as a longer transmission distance, which is suitable for long-distance transmission with low data rates and use in environments with many obstacles. For example, home automation, security monitoring, remote control, wireless sensor networks and other devices with low power consumption and long-distance communication requirements. In China, the 433MHz band is a license-free ISM open band.
2.4GHz wireless module
2.4 GHz is located in the ultra-high frequency (SHF) range, which is a globally used ISM frequency band, with a frequency range of approximately 2.400-2.4835 GHz. The 2.4 GHz band has a shorter wavelength and provides a higher data transmission rate, but the penetration and transmission distance are weaker than those of 433 MHz and 900 MHz. This band is congested because it is used by many wireless technologies, including Wi-Fi, Bluetooth, Zigbee, and many others.
2.4GHz wireless modules are widely used in Wi-Fi networks, Bluetooth devices, smart homes, wireless audio and video transmission, and some IoT devices for short-distance high-speed data transmission. Despite facing certain interference issues, its high bandwidth and global compatibility make it extremely popular in consumer electronics.
900MHz wireless module
These wireless modules are located in the frequency band between high frequency (HF) and UHF, and are usually used as ISM bands in the 902-928 MHz band in the United States and other regions. Compared to 433MHz, the 900MHz band has a slightly shorter wavelength, but still has good penetration and transmission distance, while providing a higher data transmission rate.
The 900MHz band is commonly used in wireless telephony, certain types of mobile communications, and specific IoT applications such as smart metering, remote monitoring, and certain industrial applications, as it provides good coverage in both urban and rural environments.
In summary, wireless modules in the 433MHz and 900MHz bands are suitable for long-distance communication, and 2.4GHz wireless modules are suitable for applications that require large amounts of data transmission, such as audio, video transmission, and Wi-Fi. The 2.4GHz band is the most widely used (including Wi-Fi, Bluetooth, etc.) and is therefore more susceptible to interference from other devices in the same band. The 433MHz and 900MHz bands are relatively less used by devices and have less interference.
The choice of each frequency band depends on the required application scenario, data transmission rate, transmission distance, penetration capability requirements, and regulatory restrictions in the region. In practice, it is crucial to select the most suitable frequency band for specific needs.
In addition to 433MHz, 900MHz and 2.4GHz wireless modules, there are also wireless modules with working frequency bands in 170MHz, 230MHz, 868MHz and other frequency bands, using different chip schemes, diversified choices, and suitable for more application scenarios. Most of the modules have a variety of transmission modes, low power consumption, small size, wake-on-the-air, wireless configuration and other functions, which are favored by customers.
Serial Server_Data Transmission Radio_4G DTU_ Remote Control Switch_LoRa/ZigBee/WiFi/Bluetooth Module-Chengdu Yibaite Electronic Technology Co., Ltd