Radar Antenna Component Cases: Phased-Array Face Flatness and Waveguide Flange Protection

Radar antenna components move from the integrator to a deployment site, from one site to a test range, or back to the factory for overhaul. Freight is a trivial share of the system cost, yet a single badly handled shipment can warp an array face, chip a waveguide flange groove, or destroy transmit-receive modules through electrostatic discharge, destroying tens of thousands in value and the delivery milestone with it. The conclusion is unambiguous: phased-array faces, subarrays and panels, transmit-receive modules, feeds and waveguides, and servo drive units must travel in separate compartments with layered protection. The array face needs multi-point equalizing supports plus normal-direction restraint to hold flatness variation within millimetres; waveguide flanges need dedicated non-metallic protective caps combined with a dry, clean cavity; and the case itself must be sealed to IP67 (IEC 60529 / GB/T 4208) with vibration, ESD, and outdoor climate protection stacked on top, so that components can go straight to the flatness re-measurement station after a long journey. Stacking bare subarray panels into a wooden crate and filling the gaps with straw or ordinary sponge remains the most common and most dangerous practice.

Radar antenna hardware differs fundamentally from ordinary industrial spares because two performance lines must be guarded at once: geometric accuracy and electrical behaviour. Once geometric accuracy is lost, there is usually no large tooling on site to restore it. Once electrical behaviour is degraded by static discharge or moisture, the fault often only surfaces during full-system integration testing, and the rework chain becomes extremely long. An antenna face has low stiffness, low areal density, and large area, so it is the component most likely to bend under its own weight. Waveguides and feeds carry plated surfaces and seal grooves, where any metal-to-metal contact can degrade VSWR. A servo drive unit combines encoder, gearbox, and brake in one housing, and it is most vulnerable to axial shock and sustained low-frequency vibration. This article gives selection parameters, liner architecture, cushioning, sealing, and outdoor climate measures by component category, together with acceptance clauses that can be copied directly into a procurement technical agreement for integrators, antenna subsystem suppliers, and equipment operators.

Table of Contents

• Typical Failure Modes in Radar Antenna Component Shipping
• Array Face Flatness and Micro-Deformation Control
• ESD and Moisture Packaging for Transmit-Receive Modules
• Clean Protection of Feed and Waveguide Flange Faces
• Securing, Damping, and Rust Prevention for Servo Drive Units
• Bending-Resistant Shipping of Antenna Frames and Radomes
• Case Materials, Sealing Class, and Outdoor Climate Protection
• Vibration and Cushioning Design: From Random Vibration to Drop
• Temperature, Humidity, Condensation, and Outgassing Control
• Custom Liner Tooling and Irregular Component Restraint
• Packing Orientation, Lifting, and Stacking Markings
• Transit Compliance Testing and Face Re-Measurement Acceptance
• Mixed Loading and Component Manifest Management
• Case Turnaround, Cleaning, and Service Life Management
• FAQ
• Conclusion and Further Reading

Typical Failure Modes in Radar Antenna Component Shipping

Field records group antenna transport damage into four families. The first is geometric: warped faces, crushed panel corners, bowed frames, and misaligned seams between subarrays, usually caused by too few supports, concentrated loads, or long-term stacking pressure. The second is interface damage: a waveguide flange groove dented by impact, connector pins bent, burred threaded holes, almost always the result of relative movement between components. The third is electrical: ESD destroying the low-noise amplifier or phase shifter inside a transmit-receive module, leakage current rising in humid air, and mould growing on damp liner material and then contaminating mating faces. The fourth is material degradation: silver-plated waveguide bores sulphidising to black, rubber seals hardening with age, and radome adhesive layers delaminating under sustained vibration.

All four families share one trait: none of them appears on the day of unloading. Flatness deviation only shows up under a laser tracker or optical flat, static damage only appears during a powered self-test, and salt-spray corrosion begins as a faint discolouration of the plating. The protection plan therefore has to be preventive, re-measurable, and traceable rather than reactive. The table below pairs the failure focus of six core component categories with the corresponding protection actions, so each item can be checked individually.

Array Face Flatness and Micro-Deformation Control

Flatness is the hardest requirement in the whole transport package because it contradicts support itself. Too few support points and the panel sags; too many and the loading becomes local and concentrated, pressing high spots into the face at each support. The workable answer is equalising multi-point support combined with edge restraint. The number of support posts follows panel stiffness and span, and engineering practice places support spacing at no more than one third of the panel short-edge length. Each post carries an adjustable screw, and during assembly a feeler gauge is used point by point so that every support carries an even share of the load. The support pad itself is 5 to 10 mm closed-cell EVA, spreading contact stress and preventing point contact.

Orientation matters just as much. The array face should travel face-up in a horizontal attitude, or at no more than 15 degrees from vertical with full-width backing support. Two subarrays must never be stacked face to face, and a subarray must never act as a load-bearing base with other cases stacked on top. For lateral restraint, EVA side blocks at least 20 mm thick are placed around the panel, leaving a 2 to 3 mm assembly gap that is filled with a low-rebound foam. That combination absorbs lateral shocks while avoiding continuous edge pressure at normal temperature. Straps are used only to restrain movement; tension is set so that hand pressure depresses the strap by about 10 mm, which is an experience value. Tighter straps convert their own tension into bending moment in the face.

Re-measurement closes the loop. Measure flatness before packing, after packing, and on arrival. A before-and-after difference within 0.3 mm confirms the support scheme is sound; a difference above 0.5 mm means the support loads are uneven or the straps are over-tensioned. For long-term storage, repeat the measurement quarterly so that plastic settlement of the foam cannot silently remove support. The cavity logic for large irregular parts of this kind is described in custom foam insert design; antenna panels are thin-walled, large-area parts and follow completely different rules from small precision items.

ESD and Moisture Packaging for Transmit-Receive Modules

A transmit-receive module contains gallium arsenide or gallium nitride power amplifiers, a low-noise amplifier, and a phase shifter, and it is a textbook electrostatic-sensitive device. Human-body-model withstand voltage may be only a few hundred volts, while a person walking on dry carpet can accumulate more than a thousand volts. ESD protection in transit means keeping everything at the same potential along the whole chain. Modules go first into individual metallised shielding bags, vacuum or semi-vacuum sealed, then into a conductive foam compartment tray. The tray is bonded to the case with conductive tape or a metal braid, a grounding terminal is fitted inside the case, and the whole case is bonded to the bench earth rail before it is opened.

Humidity is the second variable. Below about 30 percent relative humidity, synthetic liner material and plastic case walls readily generate and retain static charge, so long-term storage and shipping environments should be held at 30 to 60 percent relative humidity with a humidity indicator card in the case. Note that desiccant and antistatic control pull in opposite directions: over-drying intensifies static accumulation, so desiccant dosing in an ESD case should stay conservative, typically 20 to 40 g per cubic metre, with the aim of suppressing condensation rather than producing absolute dryness. Liner material should be conductive EVA or PE with surface resistance between 10^4 and 10^6 ohm, which both cushions and avoids an insulating surface. Markings follow GB/T 191 with the antistatic and keep-dry symbols. For the full architecture, see the ESD shielding case approach, whose treatment of foam resistance bands and grounding methods applies equally to transmit-receive modules.

Clean Protection of Feed and Waveguide Flange Faces

Almost all of a waveguide's value sits in two surfaces: the plated bore and the flange seal groove. A silver-plated bore sulphidises in sulphur-bearing air, raising surface resistance and insertion loss; a chipped seal groove means the O-ring cannot form a continuous sealing line even at the specified compression, and there is no field repair. The protection concept is inner plug plus outer guard. The flange receives a dedicated protective cap, preferably in nylon or PEEK rather than metal so the cap itself cannot become the impact source. The bore is closed with a clean plug whose mating surface is fine enough not to shed, and foamed materials that crumble are not acceptable here.

Feeds, couplers, and flexible waveguide sections are thin-walled, so restraint must hold the body in a clamp and leave the flange ends free of load. A flange face must never rest on the case floor or a support beam, because that face is the weakest sealing interface. The bend radius of flexible waveguide must stay above the maker limit, with 10 times the outer dimension a common experience value, and the section should be coiled on a drum or carried on a large-radius saddle so no permanent crease forms. For high-cleanliness feeds, the case cavity can be charged with dry nitrogen or fitted with low-dust desiccant, and handling is done in powder-free gloves. On arrival, inspect in the order flange face, then bore, then electrical performance; the material comparison table in seal material selection helps when specifying the seal compound and its compression set target.

Securing, Damping, and Rust Prevention for Servo Drive Units

A servo drive unit integrates motor, gearbox, encoder, and brake in a single housing, and it fears two load types in transit: axial shock and sustained low-frequency vibration. Axial shock comes mainly from handling drops and produces small axial displacement of the gearbox output shaft, which drifts the encoder reading. Sustained vibration accelerates fretting wear in bearings, producing the classic complaint that a unit is noisier after shipping than before. The proven method seats the mounting flange against a rigid base plate and bolts it through the original mounting holes, creating a rigid load path from case to plate to unit. The plate is then wrapped in 15 to 20 mm medium-density EVA, forming the first cushioning stage against the outer case.

When several units travel together, the gearbox output shaft must never be used as a support point, and two shaft ends must never bear against each other. Shaft ends get protective sleeves that are individually restrained and that serve both rust and impact protection. Steel surfaces are treated with VCI film or vapour-phase paper, oil seals are checked for weeping before packing, and on arrival the shaft end is inspected for oil traces before the unit is turned by hand to confirm it rotates freely. For ocean freight, add a humidity indicator card and desiccant and mark the case with this-side-up and centre-of-gravity symbols. Where a case may sit outdoors temporarily, the shell also needs UV and rain resistance, as covered below.

Bending-Resistant Shipping of Antenna Frames and Radomes

Frames and radomes combine long, thin, and brittle characteristics. A long frame supported only at its two ends sags under its own weight, and transport vibration makes that deflection oscillate repeatedly until a weld or bonded joint cracks. The support scheme should become equally spaced multi-point support with spacing within 800 mm, with soft pads under each point so the frame carries uniform load, and frames longer than 3 m should use a dedicated cradle case or travel in sections.

Radomes are usually fibreglass or composite sandwich structures and are most vulnerable to local concentrated load and sharp impact. The radome should travel in its designed load attitude, normally its installed attitude, supported by curved saddles that match its curvature and are lined with felt or closed-cell foam, so contact area is as large as possible. Point support on a curved shell is not acceptable. Surfaces carry protective film so dust cannot embed in the gel coat. Lifting uses wide slings rather than wire rope, with pick points chosen per the design and the case marked in contrasting colour at the centre of gravity and the pick points. On arrival, check the gel coat for star cracks and the sandwich for debonding, for which a tap test gives a first indication, before checking frame straightness.

Case Materials, Sealing Class, and Outdoor Climate Protection

Radar equipment is deployed along coastlines, on plateaus, in deserts, and on islands, so the case faces an outdoor climate rather than a warehouse environment and cannot be specified from a waterproof-case template alone. The shell should be modified PP or ABS engineering plastic, while large or heavily loaded cases can use rotationally moulded LLDPE with an aluminium frame for torsional stiffness. Any case intended for lifting should have metal lifting inserts moulded into the base so slings cannot bite into plastic walls.

Sealing has three elements: a main gasket, a pressure equalisation valve, and latch compression. The gasket should be silicone or EPDM at 25 to 35 percent compression, with silicone preferred for low temperature. Latch count follows span, with wider spans needing more latches and even circumferential compression; hinge and latch mating geometry follows the general practice in hinge, latch, and seal construction. The pressure equalisation valve is the critical radar-specific part. When equipment moves from lowland to plateau, or from a hot outdoor site into a temperature-controlled store, the differential across the case wall can reach tens of kilopascals; without a valve the gasket can be sucked out of shape at the moment of opening, or the lid can be effectively vacuum-locked. A waterproof breathable valve solves this. The table below lists the common sealing and climate indicators.

Vibration and Cushioning Design: From Random Vibration to Drop

Cushioning exists to bring excessive acceleration down to what a component can tolerate, and engineering offers two routes: energy absorption through foam compression, and a secondary suspended stage. For a large thin panel, thick foam alone is not enough, because compression across a large area is uneven and creates hard spots. A more reliable arrangement distributes elastic support blocks between the shell and the liner to spread load across many points, then covers them with one continuous foam layer, producing point support plus surface cushioning.

For material selection, radar components typically use closed-cell EVA or PE foam at 45 to 70 kg per cubic metre, with compression under static load held between 10 and 20 percent. Too soft and the foam takes a permanent set under sustained vibration; too hard and it stops cushioning. Drop criteria are scaled by component mass: light panels are checked against a 60 to 80 cm corner or edge drop, while heavy servo units are checked against 40 to 50 cm. These are engineering experience values and final numbers should be confirmed by physical test. Where the route includes long road legs, watch for low-frequency amplification: if the natural frequency of the foam-and-component system falls in the 5 to 20 Hz band and approaches the dominant trailer frequency, resonance occurs, and the answer is to change foam density or add a damping layer. Test sequences can be designed around the ISTA transport testing procedure and the ASTM D4169 distribution cycle.

Temperature, Humidity, Condensation, and Outgassing Control

Condensation is the most insidious damage source in radar shipping. A container at sea experiences a breathing cycle driven by day and night temperature swings: air inside warms and its moisture pressure rises by day, then cools at night and water condenses on metal surfaces, with silver-plated waveguides, connectors, and steel fasteners first in line. Control works in three layers. First, case sealing plus the equalisation valve reduces exchange with outside moisture. Second, desiccant goes inside with a humidity indicator card, dosed at 60 to 100 g per cubic metre by experience, with the upper end for long ocean legs. Third, do not open the case on arrival; let it equalise in the store for 2 to 4 hours so a temperature differential cannot flash-condense on cold parts.

Outgassing requirements apply chiefly to clean optical and microwave paths. EVA and foam release trace organic volatiles as temperature rises, and those volatiles can form a hazy film on a waveguide bore or radome surface. Where low outgassing is specified, the liner should use a low-outgassing formulation or a low-outgassing polyimide or polyester film barrier, and plasticised PVC must be avoided. Where a component must be unpacked in a cleanroom, wipe the case exterior before entry and never use fibre-shedding liner material.

Custom Liner Tooling and Irregular Component Restraint

Antenna components share three traits: irregular geometry, tight precision, and modest batch size, which means the liner decision is a trade-off between tooling cost and restraint quality. Above a threshold volume, with 10 units per model a useful experience value, carving an EVA cavity from a steel tool against the 3D model is the most economical route. Cavity clearance is 1 to 2 mm per side, depth is 60 to 70 percent of component height, and the result restrains the part while staying easy to load by hand. For small batches or frequently changing models, a standard case plus a modular divider system replaces full tooling, using adjustable partitions, locating blocks, and locally carved pads to build the restraint cavity at low cost and fast changeover.

The two approaches can be combined: carved cavities handle the main load-bearing geometry, while small compartments hold accessory bags, flange caps, and cables. The transmit-receive module tray positions, waveguide clamp positions, and servo base plate positions should all be numbered on one insert drawing and matched one-to-one with the packing list, so that on-site counting proceeds by position number. Construction details for reconfigurable restraint are described in the removable divider system reference.

Packing Orientation, Lifting, and Stacking Markings

Get the orientation wrong and every other protection measure loses value. The general rules: heavy items low, light large-area items high; array faces and radomes never compressed; centre of gravity as low as possible and near the geometric centre of the case. At the stacking level, cases containing antenna components should not carry other cases on top. Where stacking is unavoidable, fit a load-bearing top frame, limit stacking to two layers, and never place waveguides or feeds in the lower case.

Marking follows GB/T 191 and GB/T 13384 and should include this-side-up, keep-dry, antistatic, fragile, centre of gravity, pick points, plus case number, part number, net weight, and gross weight. Pick points must align with the case structural load path, slings must be sleeved, and the lifting angle should stay within 60 degrees to limit horizontal force. Wheeled cases should be marked no-dragging, because forcing a case with a jammed wheel is a common cause of base cracking. For sites that move frequently, a caster and trolley handle configuration can be specified, but the wheel set must be rated for the loaded gross weight with a 1.5 times safety margin.

Transit Compliance Testing and Face Re-Measurement Acceptance

Verification of antenna shipping runs on two tracks: case level and component level. At case level, run stack, vibration, drop, and impact per GB/T 4857 transport packaging testing to confirm the shell, latches, gasket, and liner survive limit loads. At component level, before the liner design is frozen, run a dummy load trial using ballast or a scrapped unit to verify that restraint holds and the foam does not take a permanent set. For environmental work, select methods from MIL-STD-810H, which is cited here only as a source of environmental test methodology and implies no military certification: high temperature, low temperature, thermal shock, humidity, vibration, shock, and salt spray methods can be applied to the case and protection chain rather than to antenna electrical performance.

Acceptance should be written into the agreement with quantified clauses: no impact damage or corrosion on arrival; flange caps still seated and flange faces visually clean; measured flatness change within the agreed threshold; humidity indicator card unchanged; gasket free of permanent flattening or cracking; desiccant packs intact. For the fuller standard mapping and document list, see the MIL-STD-810H environmental test compliance note.

Mixed Loading and Component Manifest Management

Spare parts for one radar subsystem often ship in a single case, and mixed loading turns on zoning and weight distribution. Zoning principle: electrically sensitive items such as transmit-receive modules and feeds occupy their own compartment and never share one with metal structures; oil-bearing items such as servo units sit in a separate zone with secondary wrapping to contain any weep; long structural items lie parallel to the case floor and never bridge a support gap. Weight principle: heavy items sit near the geometric centre and close to the floor, light large-area items above them separated by a partition, and a light item is never asked to carry load.

Manifest management is bound to the liner numbering. A packing list should carry part number and name, quantity, liner position number, unit net weight, antistatic status, desiccant requirement, packing date, and responsible person. Include a cross-reference sheet pairing the insert drawing with the list so that unpacking proceeds compartment by position number. For subsystems that redeploy repeatedly, place a round-trip record card in the case recording packing and unpacking dates, personnel, and inspection results; over time this becomes the most valuable reliability data available. For radar projects, JUNZHIJIA issues a numbered liner drawing and a case document pack built from the customer 3D model and packing list so counting and traceability are complete in one step, and supports OEM and ODM branding with model-matched seals.

Case Turnaround, Cleaning, and Service Life Management

A radar case is normally not disposable packaging but a returnable container that accompanies the equipment through its whole service life, so cleaning and life management directly determine long-term protection. After every return to store: remove dust and metal swarf from the liner surface; wipe inner and outer surfaces with neutral detergent, concentrating on the seal groove and latch area; inspect the gasket for cracking, flattening, or debonding; check the equalisation valve for blockage; and confirm hinges are tight and latch springs normal. The procedure in protective case cleaning and care applies, and pressurised hot water should not be aimed directly at the seal groove.

Service life assessment watches three things: foam compression set, with replacement advised once it exceeds 10 percent of original thickness; gasket rebound, with replacement once it no longer recovers promptly after hand compression; and stress whitening or cracks in the shell. Cases with high turnaround counts and long routes should have an annual seal spot check by spray or immersion. Economic life is often estimated at 5 to 8 years, but the sounder approach combines duty intensity with inspection results, as described in protective case service life assessment.

FAQ

Q: How much flatness change after packing is acceptable for an array face?

A: Engineering practice judges the before-and-after difference rather than an absolute figure. A common threshold is a flatness change of no more than 0.3 mm for panel-type parts and 1 mm per metre for frames. Set the threshold only after fixing the measurement method, because methods differ widely: a laser tracker suits a large integrated array, an electronic level suits a local panel area, and a feeler gauge with an optical flat suits a small high-precision face. The same array must always be re-measured with the same method and the same datum points, and the panel should be allowed to stabilise to room temperature for several hours first, since a cold panel off a truck reads differently from a warm one in a metrology room. If the difference exceeds the limit, check three things first: whether every support post was levelled point by point, whether the straps are over-tensioned, and whether the side gap has closed to zero. If all three check out and the deviation persists, the support count is insufficient and more posts or curved saddles are required.

Q: Can ordinary plastic plugs replace dedicated protective caps on waveguide flanges?

A: Not advisable. The point of flange protection is the seal groove and the face, while an ordinary plug usually closes only the bore and leaves the face exposed, so a single contact with metal during handling produces a chip. A dedicated cap differs in three ways: the body is non-metallic so it cannot itself become an impact source; it mates with the flange spigot to restrain radial movement inside the case; and it can hold a clean liner pad to exclude dust. For very small quantities or temporary substitution, a turned nylon part sized to the flange spigot is acceptable if the mating surface is fine and non-shedding. Two habits make caps work in practice. First, tether each cap to its component with a short lanyard so it cannot be dropped into a bore or left on a bench. Second, mark the cap with the flange size and, where several flange standards are in play, the bolt pattern, so a near-fit cap is never forced onto the wrong face. Caps should also be listed and counted as separate line items on the packing list and recovered with the hardware at overhaul.

Q: Must transmit-receive modules be vacuum packed for shipping?

A: Not necessarily, but the combination of electrostatic shielding and low humidity is mandatory. Vacuum packing excludes moisture and oxygen, yet the bag then clings tightly to the module and mechanical stress during handling transfers directly to large-area devices, which is a real risk for modules with heat-sink fins. A sounder approach is semi-vacuum or dry-air packaging: place the module in a metallised shielding bag, draw the air down without letting the bag cling, then heat seal, and place the bag in a conductive foam compartment tray. Bag gauge and seal width matter more than the vacuum level; a thin bag with a narrow seal fails at the fold and lets in moisture. Record the packing date on the bag, keep a humidity indicator card visible in the tray, and limit tray stacking to two layers so the lower modules never carry the upper load. Critically, opening must happen at a grounded ESD workstation with wrist straps worn, because otherwise the whole packaging effort is undone the moment the bag is cut.

Q: Does an outdoor antenna case really need a pressure equalisation valve?

A: It is recommended, especially where altitude changes or repeated movement into and out of a temperature-controlled store is involved. A sealed case under a large pressure differential produces suction at the moment of opening, felt as a lid that needs heavy force to lift, and the gasket deforms or tears under repeated instantaneous differentials. The valve lets air pass slowly while blocking liquid water, with 100 to 500 mL per minute a typical airflow range, and selection should check for a waterproof breathable membrane and dust protection. Two cautions apply. Mount the valve high on a side wall away from direct spray, and inspect the membrane at every turnaround because salt crystals and fine dust can blind it, at which point it stops equalising while still admitting vapour. If the components are extremely humidity-sensitive, accept that the valve permits some moisture exchange and increase the desiccant reserve accordingly, treating the system as breathable but humidity-controlled rather than treating valve and dehumidification as opposing choices.

Q: Can servo drive units and array faces travel in the same case?

A: Not in the same compartment, but they can share a case with proper zoning and isolation. There are three reasons. A servo unit is heavy with a concentrated centre of gravity, so any movement becomes a high-energy impact source. The unit contains lubricating oil and magnetic material, and oil mist and iron particles are contaminants for the clean faces of feeds and waveguides. The metal housing is also a hard body sitting next to plated surfaces. Where space forces mixed loading: give the unit its own rigid compartment with walls at least 15 mm thick; wrap it twice with oil-absorbing material; place it low near the centre of gravity with the array face above on a full partition; keep the straps and fixing points of the two items completely independent, never shared; and fill every remaining void so nothing can migrate during a long road leg. Confirm the arrangement with a dummy-load vibration trial before freezing the drawing.

Q: How long does custom liner tooling take, and how is the cost estimated?

A: Lead time depends on data completeness and cavity complexity. The usual flow is: customer supplies component 3D models and a packing list; liner structure and support scheme are agreed; cavity geometry is designed in 3D; tooling is cut or moulded; a first article is trial-loaded and corrected; then batch production runs. With complete data and a simple single cavity, sampling is measured in weeks. With multiple compartments, adjustable restraint, or a load-bearing base plate, a correction round after trial fitting is normal and the overall lead time extends accordingly. Cost has three parts: liner material volume, which dominates and follows net case volume and foam density; machining hours, driven by cavity depth and count; and first-article validation. Dimensional revisions after the drawing is released are the main hidden cost, so freeze the component model and the packing list before cutting metal. The most effective way to cut unit cost is to standardise case sizes and reduce variants so one liner platform covers several components.

Q: For ocean freight to tropical or coastal regions, how should salt spray and condensation be handled together?

A: Treat them as two separate threats. Salt spray is an external corrosion source affecting metal case parts, latches, hinges, and lifting inserts; counter it with stainless steel or passivated hardware verified to GB/T 10125, where 48 to 96 hours neutral salt spray without functional corrosion is a common gate. Condensation is an internal moisture source driven by the day-night breathing effect; counter it with sealing plus desiccant plus the equalisation valve, dosing desiccant at 60 to 100 g per cubic metre with the upper end for long ocean legs, and fitting a humidity indicator card for instant reading on arrival. One easily missed operational detail: do not open the case on arrival, but let it equalise in the store for 2 to 4 hours so a temperature differential cannot deposit condensate straight onto silver-plated waveguide. On routes calling at humid ports, add a second low-dust desiccant pack, log it on the round-trip card, and note that steel parts near the container doors see the worst of the humidity cycle.

Q: What documents and customisation can JUNZHIJIA provide for radar antenna projects?

A: For radar antenna components, JUNZHIJIA delivers a pack built for traceability and acceptance. It opens with liner cavity drawings and a bill of materials generated from the customer 3D model, then adds seal specifications with compression figures, a technical statement of sealing class, temperature range, and impact rating, transit test reports written to whichever standard the buyer names, whether GB/T 4857, ISTA, ASTM D4169, or a MIL-STD-810H method, plus a packing list, a numbered liner position drawing, and a case marking scheme. Customisation covers case size families, multi-compartment liner structures, antistatic liners, flange caps, and integrated load-bearing base plates, with OEM and ODM branding and model-matched seals and spare kits. Where a radar programme has many models and small batches, JUNZHIJIA usually recommends a standard case plus swappable liner platform so tooling investment spreads across the family while per-model restraint accuracy is preserved. Sample liner drawings are issued before series production so incoming inspection can be planned early.

Conclusion and Further Reading

Radar antenna protection means controlling geometric accuracy and electrical behaviour at once: equalising supports hold face distortion down, flange caps guard the sealing interface, ESD and humidity control protect the modules, and axial restraint plus damping protect the servo units. Prove the plan with re-measurement and transit test data, then write the numbers into the agreement.

Further Reading

• Satellite Payload Component Case
• Seismic Survey Equipment Component Case
• IP67 Protective Case