Array Panel
Understanding Array Panels
The modern phased array is not built as a monolithic structure — it is assembled from modular array panels, each a complete antenna subsystem that can be independently manufactured, tested, and replaced. This modular philosophy drives both commercial 5G infrastructure and military radar design.
5G Massive MIMO Panels
A commercial 5G massive MIMO base station panel typically contains 64 dual-polarized antenna elements (128 antenna ports total), with each element connected to its own RF chain including PA, LNA, and digital conversion. The panel implements hybrid beamforming — analog phase shifting within subarrays combined with digital baseband precoding across subarrays — to simultaneously serve multiple users with independent spatial beams.
Military AESA Panels (LRUs)
An AESA radar for a fighter aircraft may consist of 20–50 modular panels (Line Replaceable Units) that tile together behind a radome to form the full aperture. Each LRU contains 50–200 T/R modules with independent phase and amplitude control. If a panel fails in the field, a maintenance crew replaces the entire LRU — a process designed to take minutes rather than hours, maximizing aircraft availability.
Key Equations
An Array Panel is a self-contained, planar antenna subsystem comprising a two-dimensional grid of radiating elements, their associated RF feed network, and potentially integrated active...
Key specifications:
40 k | 128 a | 50 m | 0 dB | 1 mW | 30 dB
Gain: G = ηap×4πA/λ²
Comparison
| Aspect | Array Panel Spec | Typical Range | Impact | Design Note |
|---|---|---|---|---|
| Primary function | This modular philosophy drives both comm... | Application-dep. | Critical | Verify in sim |
| Operating range | Military AESA Panels (LRUs) An AESA rada... | Application-dep. | Critical | Verify in sim |
| Performance | Each LRU contains 50–200 T/R modules wit... | Application-dep. | Critical | Verify in sim |
| Integration | If a panel fails in the field, a mainten... | Application-dep. | Critical | Verify in sim |
| Trade-off | See specification | Application-dep. | Critical | Verify in sim |
Frequently Asked Questions
How heavy is a typical 5G array panel?
Commercial 5G massive MIMO panels (64T64R configuration) typically weigh 25–40 kg including the integrated radome, mounting hardware, and power supply. This weight is driven primarily by the heatsink/thermal management structure needed to dissipate 500–1500W of total power from the active electronics. Reducing panel weight is a major engineering focus, as tower wind loading limits the number and size of panels that can be mounted.
What is the difference between a passive and active array panel?
A passive array panel contains only the antenna elements and a passive feed network (power dividers, phase shifters if mechanical). An active array panel integrates active electronics — amplifiers, digitally controlled phase shifters, and potentially ADCs/DACs — at every element or subarray. Active panels enable electronic beam steering, adaptive nulling, and spatial multiplexing capabilities that passive panels cannot provide.
How are panels calibrated after installation?
Over-the-air (OTA) calibration. After mounting on a tower, the panel runs a self-calibration routine where each element transmits a known signal while the others receive, measuring the relative phase and amplitude of each RF path. The measured errors are stored as correction coefficients. This OTA calibration compensates for installation-induced cable phase variations and ensures the panel's beamforming performance matches its factory specification.