Statistical resolution limit (SRL) — closest two targets tellable apart vs SNR · hover a point (session 014z DF model)
10.1 dBi D (PML_8) · 9.3 dBi realized (η 83%) · F/B 19.4 dB · E-HPBW 54° · S11 −17.8 dB @915 PML (−27.5 MUR-tuned, res 913.9) · Zin 48−j4 · BW(−10) 62 MHz — whole 902–928 ISM band · worst 3D lobe −13.4 dBc (down-back θ=140°) · BOOMLESS: 4 floating copper islands on an INTACT 2 mm board — CNC isolation-milled (2–3 mm moats through the foil, background peeled), board NOT cut through, nothing to snap · split DE, 4 mm gap, pigtails split only ±5 mm · textbook hairpin U trace (d=16) · centre→+y arm, shield→−y arm + 1:1 choke (4–5 beads) · coax down the centreline · optional flange-SMA through-board (pattern on schema) · 4× M4 corner mounts · 289×135 mm · full slab costs ~10% η vs outline-cut; parasitics tuned at scale 0.87 with driven −6 mm (uniform 0.84 centres match but guts F/B to 6 dB)
⬗ stack-up: copper-clad FR4 2.0 mm · board NOT cut through — copper isolation-milled, background foil peeled · 4 floating islands, no boom
