DCubed — Parametric GRIN & Luneburg Lens CAD

Build envelope

Ø120 mm

Surface

— tris

112³ grid

Lattice workspace

Set the radar, geometry and process parameters, then synthesise the sub-wavelength lattice into a watertight, print-ready solid.

Press generate mesh to begin

Section

no surface yet

Project setup

Design preset▼Loads a complete, printable starting point.

A · Radar & electromagnetic

Operating frequencyGHzX-band tracking radar sits at 8–12 GHz.Target radar cross sectionm²Fighter-aircraft class: 1.5–10 m².Refractive index profile▼

B · Physical & geometry

Lens type▼Outer radius Rmm

C · Additive manufacturing

Printing technology▼Material preset▼

εrtan δρ g/cm³

Sub-wavelength resolution▼Lattice cell geometry▼Index discretisation12Concentric shells used to smooth n(r).Conductive backing interface▼Slot depthmmMesh resolution112³Higher values resolve finer lattice detail but take longer.

Wavelength λ

29.98mm

Voxels / cell

2.7

Unit cell

2.998mm

Estimated RCS

1.60m²

Passive gain

20.4dBi

Total weight

280g

Solid blank

1040g

Lattice volume

243.1cm³

Min feature

0.200mm

Refractive index profile n(r)

Shell inspector#1 · n 1.414 · 63.4%

Cell pitch: 2.998 mm
Feature: 0.646 mm
Knob t: 0.957

Shell schedule

#	r mm	n	fill	n real	feat mm
1	2.5	1.4136	63.4%	1.4136	0.646
2	7.5	1.4087	62.7%	1.4087	0.640
3	12.5	1.3988	61.2%	1.3988	0.628
4	17.5	1.3838	59.1%	1.3838	0.610
5	22.5	1.3636	56.1%	1.3636	0.584
6	27.5	1.3379	52.3%	1.3379	0.546
7	32.5	1.3064	47.6%	1.3064	0.495
8	37.5	1.2686	42.0%	1.2686	0.447
9	42.5	1.2240	35.2%	1.2240	0.369
10	47.5	1.1719	27.2%	1.1719	0.282
11	52.5	1.1110	18.8%	1.1176	0.200
12	57.5	1.0400	0.0%	air	—

Slicing safety check

1 shell(s) were thickened to the 0.2 mm SLA resin limit; realised index runs up to Δn 0.007 above target. Lower the sub-wavelength divisor or use a lower-εr material to recover the gradient.

1 outer shell(s) fall below the printable density and are left as open air (n ≈ 1.0), which also acts as the impedance-matching layer.

Mesh grid resolves only 2.7 voxels per unit cell (1.12 mm pitch). Raise the mesh resolution towards 216³, or use a coarser λ divisor, before exporting for print.