Time Averaged SAR Evaluation for Multi Transmitter Arrays
Dynamic time-averaged SAR evaluation balances multi-transmitter power budgets, cutting backoff penalties while securing compliance across global regulatory markets.
Vector Near-Field Array
Meaning
Multi probe antenna measurement systems capture amplitude and phase of electromagnetic fields in close physical proximity to a device under test. A vector near-field array enables rapid non destructive evaluation of antenna radiation patterns without requiring large far-field test chambers. Operational scope includes active array module testing and automated production line RF verification.
Far-field compact antenna test ranges and single probe mechanical scanners fall outside this multi probe array architecture.
Near-Field Sampling
Electronically switching across a dense grid of sampling probes captures complex electric field vectors across a defined surface. Integrating a vector near-field array into factory test stations reduces total pattern acquisition time from hours to seconds. Dual polarized probe elements measure orthogonally polarized field components simultaneously at each spatial sampling location.
Data acquisition systems record complex S-parameters across multiple frequency channels in parallel.
Far-Field Transformation
Mathematical algorithms transform measured near-field amplitude and phase data into far-field radiation patterns. Fast Fourier transform techniques process sampled vector fields to calculate 3D directivity and beam steering angles. Sampling spatial resolution must satisfy Nyquist criteria based on measurement wavelength to prevent aliasing errors during transformation.
Transforming near-field data provides accurate equivalent isotropically radiated power values.
Calibration Requirement
Precise mechanical probe positioning and phase calibration across probe channels maintain measurement accuracy across operating bandwidths. Utilizing a vector near-field array guarantees reliable antenna pattern verification during high volume manufacturing runs.