FULL-WAVE gerber'd quasi-Yagi pair (uploaded-Gerber element), mechanically joined by TWO identical 12 mm × 2 mm FR4 backing splice strips on the voltage-null lines (coplanar_monopulse_linked convention), lengthened to CROSS each board's boom for a solid connection (RF-negligible): REAR across the reflectors and FRONT across the boom spine BETWEEN dir-1 and dir-2 — longitudinal field minima, off every element tip and the feed slot, so they barely move resonance/gain yet deepen the Δ null to ≈−28…−34 dB (vs −21…−25 dB unlinked), re-simulated at 1.0λ (327.9 mm) · rotating monopulse, 100 readings/° · 1 dB steps · 3 dB noise → σ_eff 0.30 dB/° · Σ HPBW 28° (narrowest of the three) · Σ F/B 7.7 dB · Δ null −31.5 dB · single-emitter ACCURACY 0.08° (1σ) · two-emitter RESOLUTION 4.6° (1-source goodness-of-fit, WORST case for unequal emitters within 5 dB) — finest, BUT the Σ pattern now has GRATING LOBES (spatial aliasing at 1λ) → ambiguous bearing · resolution-vs-spacing = shape-preserving interpolation through 11 full-wave anchors; the 1.15λ point already sits in the shaded grating region · F/B in the 0.5–0.6λ band peaks at 8.6 dB @ 0.60λ · the u=Σ−Δ scan also reads an unequal pair's power ratio via a 2-source fit (CENTRE free + floor from the ROTATION MINIMUM): at a resolved 13° split → ratio 4.9±0.3 dB, centre ±0.3°, floor ±0.1 dB
⬗ stack-up: FR4 1.6 mm (εr 4.3) · 1 oz Cu (35 µm) · single layer · 2× 2 mm FR4 back-tie splice strips · 2-element Σ/Δ @ 327.9 mm (1.0λ)