Container-Level Tracking (Road, Rail & Sea)
Tracking intermodal containers (road trailers, rail wagons, or shipping containers) requires antennas that survive permanent outdoor exposure whilst reading tags at the distances and angles involved in vehicle and container movements. Tags may be on end walls, side panels, or at height on large metal structures. The installation is typically a gate gantry, a reader pole beside a rail siding, or a pier-side fixed point.
Before specifying a model, confirm these five site conditions. They narrow the field from six options to one or two.
How exposed is the bay? Covered indoor bays need IP65 as a minimum. Semi-outdoor and exposed bays require IP67 (temporary immersion up to 1 m, 30 min). Bays subject to high-pressure wash-downs, extreme humidity, or chemically aggressive environments, such as food production, cold stores, mining, require IP68, which covers prolonged immersion and sustained moisture.
Mounting position determines beam direction and read-zone shape. Overhead mounts read downward into the bay opening — suited to consistent pallet heights and forklift paths. Side mounts read horizontally across the bay width. Floor/embedded mounts read upward through the pallet base — useful where overhead clearance is limited or where a discreet, in-floor read point is required.
Beam pattern shapes the read zone. A symmetrical wide beam (68°×68°) gives consistent coverage regardless of approach angle — good for variable vehicle types. An asymmetrical narrow beam (25°×60°) focuses the read zone precisely, good for dense goods or reflective environments. A high-gain concentrated beam maximises range and accuracy at a fixed point, at the cost of coverage width.
How tightly must the read zone be contained? Adjacent bays, nearby inventory, and crossing forklifts all create false-read risk. The tighter the physical environment, the more important it is to choose an antenna whose beam pattern and gain level minimise reads outside the intended zone. Portal frame systems provide maximum containment with zero cross-reads recorded between adjacent portals.
Physical constraints narrow the field quickly. Low overhead clearance favours compact side-mount models. In-floor embedding requires an antenna rated for sub-surface installation. Customer-facing or aesthetic environments, retail DCs, food distribution all favour compact, unobtrusive form factors. Cable routing, backplates for easy mounting, and connector type all affect deployment time for large rollouts.
