![]() ![]() 2 also shows how a position on the corner of the PCB is better because fewer of the antenna’s fields will be obstructed, and the antenna’s performance improves compared to other locations.įigure 2. Figure 2 shows how placing an antenna can radiate energy in more directions when placed correctly on a PCB. Antennas need to radiate in six directions. Consider making the case from non-glass filled plastic unless you use a special antenna.Īn antenna’s position on a PCB can affect RF performance. ![]() If the case is made of metal or glass filled plastics, it can also inhibit the antenna’s radiated energy. Doing so lets the antenna radiate without interference from the metal object.Ī device’s outer casing can play a role in how the antenna performs. When a device is used against a metal object, you should place the antenna as far away from the metal structure as possible. The tracker will probably be fixed to the bike’s metal frame. Take the case of a tracking device for bicycles. Similarly, metal objects close to an antenna can affect its performance. A phantom head in an anechoic chamber lets you test antenna performance in a controlled environment. Such tests reveal how well the device operates close to a person or in a person’s hand (Figure 1).įigure 1. This is one reason why RF design companies conduct tests with phantom heads, bodies, and hands in anechoic chambers. If you are designing a wearable device that will be used on or close to the body, you may need to place the antenna on the side of the device facing away from the body. Place the antenna in a location that protects it from objects that might cause electrical interference with the antenna. Follow these five basic principles of designing an embedded antenna into an electronic device and get a design right the first time.īecause an antenna is sensitive to its surroundings, the general position of the antenna within the device can help or hinder a design. The design will need a revision, which adds cost and lengthens time to market. In the worst case, an antenna squeezed into a space towards the end of the design phase without consideration of the manufacturer’s intended layout guidance will probably function poorly. ![]() Getting these aspects correct from the initial design concept will help to achieve a successful launch with reliable wireless performance.Īn antenna that performs well in free space as outlined in the manufacturer’s datasheet may perform differently when installed in a device. Space on the PCB, position, clearance, the ground plane, and correct connection to other components all affect antenna performance. When designing a wireless device, pay attention to the antenna placement on a PCB. Designing an antenna into a wireless embedded or IoT device requires special care to maximize performance. ![]()
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