How much do you know about WiFi antennas?

The appearance of the WIFI antenna is usually cylindrical or flaky, and has a connector at the bottom end of the antenna as an energy feeding device, and is connected to an external connector connected to the RF front end circuit of the Bluetooth module. Another external method of antenna is to use a rotatable adapter. The advantage of this method is that the antenna can be rotated according to the needs of the application and the transmission effect is improved, but the drawback is that the cost of the rotatable joint is high.
The length of the WIFI antenna is related to its operating frequency. Usually, the usual plan is to use half-wavelength or quarter-wavelength as the length of the antenna. In addition, the WIFI antenna can also be planned in a planar manner to plan the Bluetooth antenna as a SMD (Surface-Mounted Device) component that can be soldered on the circuit board, or directly on the PCB circuit board with a simple microstrip line (Microstrip). Line) is constructed to plan the antenna, which results in a low-cost hiding antenna and contributes to the diversification of the appearance of the product.
The WIFI antenna is named after the appearance of the side face and the inverted English letter F. The WIFI antenna operates at a quarter of the operating wavelength and already includes a grounded metal surface in its construction, which reduces the sensitivity to the grounded metal surface of the module, making it ideal for use in Bluetooth module devices. On the other hand, since the WIFI antenna only needs to use a metal conductor to cooperate with proper feeding and the antenna is short-circuited to the ground plane, the manufacturing cost is low and it can be directly soldered to the PCB board.

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