RicoBangBang 0 Posted September 5, 2012 Report Share Posted September 5, 2012 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 ? Quote Link to post Share on other sites
Mr.RC-Cam 129 Posted September 6, 2012 Report Share Posted September 6, 2012 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. Quote Link to post Share on other sites
RicoBangBang 0 Posted September 6, 2012 Author Report Share Posted September 6, 2012 Thank you for the reply. What gauge would you advise for this 900 mhz antenna ? Quote Link to post Share on other sites
Mr.RC-Cam 129 Posted September 7, 2012 Report Share Posted September 7, 2012 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). Quote Link to post Share on other sites
RicoBangBang 0 Posted September 7, 2012 Author Report Share Posted September 7, 2012 You are right, I think I would use a 1 mm thick galvanized sheet. I have found a tilt shift mount at this address and think it should move the antenna if I put the appropriate servos. Quote Link to post Share on other sites
RicoBangBang 0 Posted September 11, 2012 Author Report Share Posted September 11, 2012 I have only found 2 mm galvanized steel sheet. Does the thickness have consequences on the antenna quality ? Quote Link to post Share on other sites
Mr.RC-Cam 129 Posted September 11, 2012 Report Share Posted September 11, 2012 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. Quote Link to post Share on other sites
RicoBangBang 0 Posted September 11, 2012 Author Report Share Posted September 11, 2012 Thanks. I will therefore use 2 mm thick material and will let you wether there are side effects. Quote Link to post Share on other sites
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