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RicoBangBang

Gauge and millimeters conversion

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Hello,

I should soon try to make a 910 mhz antenna but I have a doubt about the galvanized metal sheet thickness.

A 24 gauge should be 0.7010 mm and a 30 gauge should be 0.3988 mm. Am I right ?

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If you are building a 900MHz patch antenna then select a sheet metal gauge that will hold its shape with the expected field abuse, but is not so heavy it is impractical to mount on a stand. FWIW, both 24 gauge and 30 gauge seem a bit flimsy for a big 900MHz patch.

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The 900MHz patch is BIG. So the lightweight sheet metal choices that are good for smaller patch antennas are not appropriate for this big boy.

Regarding the gauge you should use: I'm a touchy-feely guy. I go to the hardware store and handle the sheet metal on the shelf. I select the sample that feels stiff enough for the job (it has to retain its flat shape with all the rough handling to/from the field).

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On common antennas (monopoles, dipoles, etc) the RF bandwidth is affected by the element thickness (diameter). But on a 900MHz patch I would not expect any practical impact to RF performance if you used 2mm thick material.

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