FR4-reinforced sheet-metal folded Yagi

~11 dBi directivity · F/B ~11–17 dB · CNC sheet metal in AIR + FR4 backing ROUTED to low-E regions (boom spine + parasitic-centre tabs) · verified: RF essentially unaffected by FR4 placement (full board ≈ spine ≈ parasitic tabs) · low-R folded feed: choke balun + ~9 pF series-cap trimmer (VSWR ~2.5)

⬗ stack-up: CNC sheet metal (in air) + routed FR4 backing (εr 4.3 · 1.6 mm) at low-field regions only

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Statistical resolution limit (SRL) — closest two targets tellable apart vs SNR · hover a point (session 014z DF model)

0510510152025−5 dB bg · harsh−15 dB bg · nominalSNR 5 dB (bg −5 dB) → SRL 13.1° (≈ 22.9 m apart @ 100 m)13.1°SNR 10 dB (bg −10 dB) → SRL 8.2° (≈ 14.3 m apart @ 100 m)SNR 15 dB (bg −15 dB) → SRL 4.9° (≈ 8.6 m apart @ 100 m)4.9°SNR 20 dB (bg −20 dB) → SRL 1.5° (≈ 2.7 m apart @ 100 m)SNR 25 dB (bg −25 dB) → SRL 1.2° (≈ 2.1 m apart @ 100 m)SNR = signal − background (dB) · background = −SNRSRL — resolvable separation (°)Statistical resolution limit — two unresolved targets (beam HPBW 42°)estimated beam · HPBW≈41° from 11 dBi (no scan) · GLRT 1-vs-2 · CFAR 5% · 5 dB interferer · 014z model
reinforced_metal_yagi.jsonreinforced_metal_yagi.step