With the rapid development of wireless communication technology and the continuous evolution of specifications in the past ten years, various wireless technologies, such as GSM, GPS, WLAN (such as Wi-Fi), Bluetooth, etc., have gradually emerged and become popular in daily life. in. The wireless communication technology itself is already profound and profound, and when it is introduced into various electronic devices and applications, it is necessary to consider the problems of electromagnetic interference (Electromagne TIc Interference) and electromagnetic compatibility (Electromagne TIc Compat, EMC). Avoid the interference of related functions and cause signal degradation and affect its normal operation. However, although the world has already enacted legislation to establish relevant electromagnetic specifications, focusing on the limitations of electromagnetic radiation and RF (Radio Frequency), it is difficult to have a situation in which different communication modules may interfere with each other. Set a fixed standard to prevent or solve related problems, which has become the most important focus for product developers.
In addition, with the recent boom in portable devices and the diversification of communication functions, these related communication modules and antennas must be designed to be lighter, thinner and shorter, to meet the needs of mobile applications. It is even more difficult to make the product to be optimized. To build more different wireless modules and antennas in extremely small and streamlined spaces, these components are bound to be more susceptible to noise interference and affect their transmission performance, because it is often observed that the transmission distance becomes shorter. The transmission rate is reduced, which is not conducive to the communication performance of the product.
With the wide application of wireless communication, wireless channels have become very crowded, channel resources are very tight, and the interference is numerous and serious. Since spread spectrum communication technology has many advantages to overcome these problems and can provide higher security technology, the wireless 433MHZ frequency band is planned and the spread spectrum communication is approved to use this frequency band. The spread spectrum communication technology has been rapidly developed and widely used. Applications.
The transmission characteristic of the wireless 433MHZ frequency band is: 433MHZ is the transmission-receiving frequency of the application-free section of our country. It can be used directly without management. The 433-band anti-interference is strong, and supports various point-to-point, point-to-multipoint wireless data communication methods. Transceiver integration, safety isolation, installation isolation, simple use, cost-effective, stable and reliable, as long as the transmission power is large enough, there is no problem when transmitting over long distances.
In some industrial applications, it is difficult to use wiring, and wireless transmission can reduce the investment of manpower and material resources. The wired method has its own inherent defects, such as complicated wiring, easy lightning strike, high installation and maintenance costs. In recent years, the rapid development of wireless communication and low-power embedded technology has spawned wireless sensor networks and brought about a revolution in information perception with its low power consumption, low cost, distributed and self-organizing features. Advantages of wireless transmission network: The anti-lightning capability is enhanced. The traditional sensor network transmits data and power by cable, while the wireless sensor network node uses battery power to transmit data wirelessly. When the product is constructed, it is only necessary to fix the product node in a proper position. The installation location is flexible, saving cloth costs.
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