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C&T RF Antennas Inc
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WiFi antenna requirements for PCB layout and structure
Source:Original | Author:C&T RF Antennas Inc | Publish time: 2018-12-21 | 506 Views | Share:

Abstract: The internal antennas are often used in several forms, in the form of shrapnel and chip patch antennas and FPC antennas. The form of the patch antenna is of a uniform size, has a fixed size, and the position and size of the pad are fixed according to the specific specifications of the antenna. In addition, according to the specific model of the antenna, there are related design guidelines for the clearance around the antenna and the recommendations for the size of the device.

 

1. Antenna form and antenna position and feed point size recommendations

The built-in antennas are often used in several forms, in the form of shrapnel and chip patch antennas and FPC antennas. The form of the patch antenna is of a uniform size, has a fixed size, and the position and size of the pad are fixed according to the specific specifications of the antenna. In addition, according to the specific model of the antenna, there are related design guidelines for the clearance around the antenna and the recommendations for the size of the device.

If the shrapnel format is used, we recommend that customers use the PIFA antenna as the form of the WiFi antenna. According to our experience, the success rate and performance of the PIFA antenna are better. The antenna RF feed pad should be 2&3mm and the pad should have no copper on all layers of the area with 0.8mm. If it is a PIFA antenna, add a 2&TImes; 3mm ground pad with a distance of 2mm between the pads.

The antenna is usually located at the top of the device, starting at the top of the PCB, cut the ground of all layers in this area by 2 to 3 mm, but the pad portion of the layer belonging to the antenna ground pad is retained.

2. Suggestions for matching circuit wiring

The topology of the antenna matching circuit is four parallel strings from the antenna, to the test port or Power amplifier. Do not lay the floor under the matching circuit and within 1.5mm around the matching network. It is better to match the placement of the network to the feed pad (but not too close).