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clanon
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Everything posted by clanon
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https://ntrs.nasa.gov/api/citations/19670009367/downloads/19670009367.pdf
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narrow band apparently
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Looks like you have a resonance , DEEP, at 2.8... try making the whole Yagi 1.16 times bigger...
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FR4 version...not so good...High losses and some mismatch , lower gain... fr4.dxf
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Feed line on FR4 needs to be THINNER 5 mm or less...to get 50 ohms...
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1.5 mm distance between sides (Feed Line)
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Should I try with FR4 double sided PCB ?...(it must work but HIGHER LOSSES...maybe z would change...tho) Tomorrow i confirm it...
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DXF , easier...TWO and a bridge in the back...+ CST (2019) Untitled.cst Untitled.dxf The one on the picture has a LOW FRECUENCY enhancement (200mhz) and a REFLECTOR PLATE some 10 cm in the back
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0.1 Brass sheet (can use ANYTHING you have)
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1.5-2mm PES dielectric...RG316 low loss cable...
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https://www.vinoth.org/rf-calculators/circular-patch-antenna-calculator trial and error but several curves for director reflectors are well known ...NEED to run several SIMULATIONS , tho
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put the Feed lines close to reflector (2mm or less) and patches where they are and REACTIVITY and VSWR should get BETTER ! jomi
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Think of each Patch as Resistances , since you have 4 patches for 5.8 and two patches for 2.4...(and YOU NEED to end up on 50 ohms) cutting in a half doesn't work for ALL patches...Filters add complexity (BUT adapt impedances to EACH BAND)
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The final impedance resonance vswr s11 , have the WHOLE as target...imho
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maybe gets better with thick copper wire and SMOOTH rounded Bends...they look to angled ...imho jeffrika7b.dxf
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8 AWG = 10 mm2 Copper... Tube is PVC 3/4 with CLAMPS (shorts)
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in Meters...?
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a Mesh wire REFLECTOR would give at least 3 dbi more...and tailor the impedance...down to 75 ohms...MAYBE...
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Already did , didn't like the changes...tried 2 versions , 2021-2022...went BACK...
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Check efficiency , usually is poor for FR4...(it hurt RX) , if you are close to 90% it's good enough...imho
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I can't open your cst (i'm using 2020)...
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same size or smaller and close by...TRY SLOTS on the patchs , that works too