Design antennas. See the fields.

Model it

Draw it in the designer, where every length is an expression over named parameters, or import a CST-compatible VBA macro. The same model can also be one Python file with a build() that places metal, dielectrics and ports.

def build(p):
    sim = Simulation(1e9, 3e9)
    sim.metal("patch").AddBox(...)
    sim.dielectric("substrate", 3.38).AddBox(...)
    sim.lumped_port(1, 50, ...)
    return sim

Model geometry

The viewer reconstructs the model geometry: a 32 × 40 mm patch on a 1.524 mm substrate with εr 3.38, a ground plane and a 50 Ω probe feed.

Meshed for FDTD

Fine cells at patch edges and in the substrate, coarser cells in air: 69 × 69 × 58 mesh lines, about 264 k cells.

Excited, the currents flow

A Gaussian-derivative pulse excites the patch. The recorded surface current is strongest near the middle and decreases toward the radiating edges, consistent with the fundamental patch mode.

It radiates

Near-to-far-field transform: 6.79 dBi broadside at 2.453 GHz, 96.5 % radiation efficiency. Radius and color both show directivity.

Checked, then exported

The recorded |S11| minimum is −34.5 dB at 2.4525 GHz. The resonance is about 0.1% below the finer-mesh value of 2.4550 GHz. Export the model, Touchstone data, drawings, a report and preview fabrication files.

One patch becomes four

The same patch four times, half a wavelength apart (61.2 mm) on one 66 × 243.6 mm board, each with its own 50 Ω port. Fed in phase they reach 11.9 dBi broadside, about 5 dB above the single patch.

Steered by phase alone

A phase that falls by k·d·sin θ₀ from port to port turns the beam. Each angle is the weighted sum of four embedded element patterns from four openEMS runs, so coupling is included and each port's active reflection moves with the beam.

Your turn

Steer the beam using valid amplitude and phase weights at a recorded frequency, and export the combined pattern.