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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