Pcb wifi antenna circuit board
The internal antenna is often used in several forms, including shrapnel form and chip patch antenna and FPC antenna.The form of the patch antenna is uniform, with fixed dimensions, and the position and dimensions of the pad are fixed according to specific specifications of the antenna.In addition, according to the specific model of the antenna has related requirements of the clearance around the antenna and equipment size recommendations and other design guidelines.
In the case of shrapnel form, we suggest that the client use PIFA antenna as the form of WiFi antenna. According to our experience, the success rate and performance of PIFA antenna are better.The size of antenna RF feeder welding panel should be 2&TImes.3mm. All layers of the PCB are free of copper under an area of about 0.8mm or more.If it's a PIFA antenna, add a 2&TImes;The distance between the two pads is 2mm.
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The usual position of the antenna is on the top of the equipment, starting from the top of the PCB, cutting off the ground of all layers within this area by 2 ~ 3mm, but the part of the pad of the layer belonging to the antenna ground pad shall be retained.
The topology of the antenna matching circuit for starting from the antenna four pieces and strung together, string together, and to test the mouth or Power amplifier.Do not spread the floor under the matching circuit and in the 1.5mm area around the matching network.Match the placement position of the network closer to the feed pad (but not too close).
The signal transmission line from the WiFi module to the antenna matching circuit is a microstrip line of 50ohm characteristic impedance.To avoid loss on the microstrip line, modules should be as close to the antenna as possible.The microstrip line must be sized according to the specific PCB.Intersecting lines are not allowed to pass between the microstrip line and the ground.
It is especially important for the area near the antenna to make the outer area as complete as possible without being broken up (the part not inside the shield).The antenna current must be isolated from the noise current. If the ground area near the antenna is damaged to be incomplete, a filling ground plane must be generated in the relevant area below the antenna and sutured with the hole to make it complete.The antenna current must flow only through the surface plane and the noise current must be limited to the full ground plane inside.
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