The use of antennas is becoming more and more popular, especially the WiFi antennas are essential in the family. Whether built-in or external WiFi antennas are Playing an important role. Your laptop, smartphone and PC, no one can get on without it.
As market competition intensifies, Hardware devices are evolving in an integrated way. Antennas are also built into embedded by external evolution, Let’s first introduce these types of antennas applications:
(1) On Board: Adopt PCB etching to form, Performance is limited, low cost, Applied to the Bluetooth，WIFI module integration.
(2) SMT: made of ceramic, metal and PCB, Performance cost is moderate, Suitable for large quantities of embedded modules.
(3) IPX: Use PCB or FPC + Cable, Performance is good, The cost is moderate, Widely used in OTT and terminal equipment.
(4) External: Plastic rod antenna, high performance, independence, but high cost, Applied to terminal devices, no need to consider issues such as EMC.
The ultimate aim of the antenna is to radiate radio frequency signals to free space, so the antenna design is very important. But antenna design relies heavily on the features of the installed platform. AS the antenna is sensitive to the surroundings, so antennas are unique to each platform under these situations. Because it is not clear what the customer is thinking about the antenna design, Here we show some Suggestions for our antenna design for portable devices, which is convenient for customers to design their own circuit and PCB better,and increase opportunities for project success. However each project has its own characteristics, So still have some questions that need to be analyzed;
The WiFi antenna requires for the PCB layout wiring and structure, the antenna’s form and antenna location and feed point size recommendations: The built-in antennas are frequently used in several forms, such as it is divided into shrapnel form and chip patch antenna and FPC antenna. The form of the patch antenna is uniform, and has a fixed size. The position and size of the discare also fixed based on the antenna of the specified specifications. Other design guidelines such as the requirement of the net clearance and the size of the equipment are proposed according to the antenna of the particular type of antenna.
If you take a shrapnel form, We recommend that customers adopt PIFA antennas as a form of WiFi antennas. According to our experience, The PIFA antenna has a better chance of success and performance. The antenna RF feeder shall be made of 2 x 3mm, The soldering disc contains around 0.8mm in area and the PCB is not copper at all levels. If for PIFA antenna, Plus a 2 by 3mm solder disk. The distance between two welded plates is 2mm.
The antenna is usually placed at the top of the device, PCB top, Cut off all the layers in the area from 2 to 3mm, But the parts of the welded plate that belong to the dish are preserved.
The person who is in charge of the project management and the project design is lack of understanding of the antenna, and constraints by the structure of the program and the supremacy of the appearance. So that we go to the last step to “match” the antenna, the antenna debugging account for most of the time the whole antenna design process. This is essentially different from the overall design of the antenna, which often cannot lead to a high performance and beautiful appearance. Therefore, let the antenna engineers involve and put forward some proposals about antenna related schemes in the design of the program, especially in the shape and structure of the product design stage. Antenna engineers can work together to design a more reasonable appearance and high performance antenna, improve the electrical performance index of the antenna, so that the overall performance of the product has a higher quality.