Sub-array phasing · directed energy

Cluster phase control — what it costs you.

Same 20×20, 400-element aperture. Same total power. λ/2 spacing. The only thing that changes is how many elements share one phase shifter. Steer the beam and watch the grating lobes appear.

Phase control granularity

Steer · azimuth0°

Steer · elevation0°

Pattern in real space · |AF|² (dB)

u = sinθ·cosφ (azimuth →) −40 ▸ 0 dB

Readout

Phase shifters

400

Peak grating lobe

—

Main-beam scan loss

0.0 dB

Grating-lobe-free scan

—

Aperture tiling

Principal-plane cut · azimuth (elevation fixed at steer)

Realised pattern Cluster (sub-array) envelope Main-beam direction