Make a simple infinite network gain antenna with a soda can

Calculation formula: F = D × D / 16H (m)

Where D is the diameter of the paraboloid, and H is the depth of the paraboloid, with units in meters.

Considering there may be some error, a simpler estimation formula can be used for calculation, i.e., F = 0.3D to 0.4D.

Step one: Prepare materials

Materials needed: One aluminum can, the original wireless router antenna.

Auxiliary tools: Scissors or hand saw, ruler, calculator, paper, pen.

Step two: Cut the aluminum can

According to the length and position of the existing antenna on the wireless router (wireless AP), perform a vertical cut on the aluminum can. You can leave one base to facilitate fixation. Use scissors to cut the aluminum can into two symmetrical parts, dividing the side into two equal parts.

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Step three: Calculate the focal point

Directly apply the formula introduced above. Then, based on the actual situation, make appropriate adjustments to find the optimal position. You can use the software that comes with the wireless network card for measurement. After selecting the focal point, you can fix it.

Step four: Fix the aluminum can

To fully enhance the gain of the antenna in a specific direction, the linear antenna needs to be evenly fixed at the focal point of the cylindrical paraboloid of the cut aluminum can. After selecting the focal point, to facilitate future use, the aluminum can needs to be relatively fixed to the antenna. The method of fixation can be left to your creativity. In any case, non-metallic materials should be used for fixation. Below is an illustration of using tape for fixation.

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