Single-layer coplanar quasi-Yagi (slot balun)

8.6 dBi directivity · 6.9 dBi realized (η 68%, FR4 loss) · F/B 9.3 dB · ribs-only FR4 · 4 mm slot cut through FR4 (air balun) · S11 −29 dB · Gerber · F/worst-3D-lobe 9.3 dB

⬗ stack-up: FR4 1.6 mm (εr 4.3) · 1 oz Cu (35 µm) · single top layer, ribbed

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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 17.3° (≈ 30.4 m apart @ 100 m)17.3°SNR 10 dB (bg −10 dB) → SRL 11.0° (≈ 19.3 m apart @ 100 m)SNR 15 dB (bg −15 dB) → SRL 6.5° (≈ 11.3 m apart @ 100 m)6.5°SNR 20 dB (bg −20 dB) → SRL 4.2° (≈ 7.4 m apart @ 100 m)SNR 25 dB (bg −25 dB) → SRL 1.2° (≈ 2.0 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
coplanar_yagi.jsoncoplanar_yagi_gerber.zipcoplanar_yagi.step