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　　The snake-shaped on-board antenna is one of the most widely used types of antennas for wireless communication modules. It is used in fields such as Bluetooth, WiFi, and ZigBee, which have low performance requirements but high space requirements. 　　When designing the onboard serpentine antenna, grasp the basic principle, and then meet the design 4G/Cat-1/NB DTU Factory requirements according to the actual clearance of the clearance area provided by the board, combined with the surrounding environment of the antenna such as metal, large capacitor, inductor, shield. 　　Principle 　　1、Current distribution of a serpentine antenna 　　As shown below: 　　Figure 1 Analysis of current direction of serpentine antenna 　　It can be seen from the figure that the currents on the two adjacent bends of the serpentine trace are equal in magnitude and opposite in direction; from the principle of electromagnetic field generation, if the serpentine trace is adjacent to the two bends infinitely

　　Background of wireless development: With the rapid development of science and technology, smart homes, smart agriculture, and smart cities are springing up. And the development of these industries is inseparable from the application of wireless. The traditional wired connection is not only costly, but also includes wiring installation and maintenance. serial module And the mobility is also very poor, can not meet the development needs of the intelligent industry, so wireless applications have entered the stage of the development of the intelligent industry. 　　In the use of wireless transmission, the wireless use of the 433M band is more widespread. The main reasons are: 　　433M is the ISM band 　　433M long transmission distance 　　433M strong anti-interference ability 　　433M should be relatively balanced in terms of transmission speed and diffraction performance. 　　In wireless applications, traditional point-to-point transceivers can no longer meet the application requ