4-element PCB Yagi (skeletal FR4)

9.5 dBi · F/B 13.5 dB · S11 −15 dB · drone-light · F/worst-3D-lobe 13.5 dB

⬗ stack-up: FR4 1.6 mm (εr 4.3) · 1 oz Cu (35 µm) · skeletal

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

051015510152025−5 dB bg · harsh−15 dB bg · nominalSNR 5 dB (bg −5 dB) → SRL 16.3° (≈ 28.7 m apart @ 100 m)16.3°SNR 10 dB (bg −10 dB) → SRL 10.6° (≈ 18.6 m apart @ 100 m)SNR 15 dB (bg −15 dB) → SRL 6.2° (≈ 10.9 m apart @ 100 m)6.2°SNR 20 dB (bg −20 dB) → SRL 4.2° (≈ 7.4 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 60°)real full-wave az beam · sequential-lobing Δ · GLRT 1-vs-2 · CFAR 5% · 5 dB interferer · 014z model
yagi915.json