Monopulse DF drone mount — 2.0 mm variant (split-attach crossed hexapod + 3.2 mm rear bar)

VARIANT of the drone-mounted 0.60λ Σ/Δ pair: boards on 2.0 mm FR4 and the REAR ATTACH SPLIT to ±35 mm on the reflector tie — the split gives the seesaw mode a d² restoring arm and shortens the bar's cantilever, so the rear tie only needs 2→3.2 mm G10 (vs 6 mm at a single centre point), and the FDTD cost of dielectric on the reflector line COLLAPSES: ΔΣ F/B 0.02 dB (8.58→8.56; 6 mm bar: 0.19; 15-tall blade: 0.40) — gain and Δ-null unchanged · RF also unchanged by the 2.0 mm substrate itself (single-element FDTD: 902 MHz, S11 −24.5 dB @915, 8.95 dBi → NO element retune) · MOUNT: 6-strut CROSSED hexapod, feet re-optimised on the coupled flexible-board model (rear struts from the ±35 split points run FORWARD to (164,±80); front V's from the boom bonds run BACKWARD to (4,±42)+(24,0) — the crossing restores the diagonality the split destroys) · COUPLED model: first board mode 33 Hz (same as the 6 mm single-point design; 8-strut = 32), reflector sag 0.26 mm/g (0.24% λ at 3 g — RF-invisible) · TRADEOFF stated: splitting re-introduces the yaw z-leak (±z at the two points → bar seesaw in series), so yaw drops from 715 Hz (single-point octahedral) to a bar-limited ~33 Hz — a brisk 5 rad/s² drone yaw moves the Δ-null ~7 m°, still 15× inside the 0.1° DF spec, and 33 Hz sits below the prop bands (no resonance) · dipole/director overhang flap OUT of the 2P band (227/284 Hz) · LEDGER vs the 1.6 mm spar+ribs build: boards +24 g, bar +10 g, spar+ribs −110 g → NET −76 g and two fewer bonded parts · CAVEAT statically determinate (collapse on one strut/bond loss) — for fail-safety use the 8-strut braced mount on the main drone card · interactive 3D below

⬗ stack-up: 0.60λ Σ/Δ pair (2× routed 2.0 mm FR4) · rear tie 12×3.2 G10 (split attach ±35 mm) + front tie 12×2 · crossed 6-strut GFRP hexapod, coupled-model-optimised feet · 15" quad, CF frame

← all designs