.jpg)
A nosecone can have the right shape and still cause problems if it blocks the signal from the equipment inside. The same goes for a panel covering a telemetry antenna. It has to protect the hardware from the surrounding environment without interfering with radio transmission.
That is where RF transparent materials come in. At AMC Composites, we manufacture RF-transparent nosecones and panels for telemetry devices. We also produce custom carbon fiber parts, but carbon fiber is not always the right reinforcement for a component sitting directly in an RF signal path. The material has to work for both the structure and the electronics behind it.
RF transparency is not an all-or-nothing property. A composite can transmit radio waves while still reflecting or absorbing part of the signal. What matters is whether those losses are acceptable for the antenna and its operating frequency.
Three factors deserve attention when evaluating an RF transparent material:
A material that performs well at one frequency may behave differently at another. Curved surfaces also complicate matters because the signal may strike different parts of the component at different angles.
The finished laminate, not just the reinforcement fabric, needs to be evaluated against the RF requirements.
.jpg)
Consider a UAV with a carbon fiber airframe and an antenna positioned behind its nosecone. Carbon fiber may be a good choice for the surrounding structural components, where stiffness and low weight are priorities. Putting the same laminate directly in front of the antenna is a different decision.
Carbon fibers conduct electricity. Depending on the laminate architecture, thickness, and operating frequency, they can reflect or attenuate electromagnetic waves. A conventional carbon fiber shell should not be assumed to provide the transmission needed for an RF window.
Changing the fiber arrangement does not automatically solve the problem. The chopped reinforcement discussed in Forged Carbon Fiber Strength offers different molding and mechanical characteristics, but that does not make forged carbon inherently radio-transparent.
Fiberglass behaves differently because glass fibers are electrically insulating. Our carbon fiber vs fiberglass comparison explains the structural trade-offs between these reinforcements. For an RF-sensitive component, dielectric behavior adds another requirement to that decision.
A radome protects an antenna or radar system while allowing electromagnetic waves to pass through its structure. The reinforcement, resin, and laminate design all affect how successfully it performs that job.
Fiberglass is widely used for radome composites because glass reinforcement is electrically insulating and can be combined with resin systems selected for their dielectric properties.
A fiberglass radome can offer a practical balance of mechanical protection, weight, manufacturability, and RF performance. The specific glass type, fiber content, resin, and wall thickness still need to be considered. Not every fiberglass laminate will deliver the same transmission characteristics.
Quartz fiber is another option where low dielectric loss is particularly important. Its electrical properties make it useful in specialized radome designs, including applications where signal transmission must be controlled over a defined frequency range.
Material cost, processing requirements, and mechanical performance also influence whether quartz is appropriate. It should be assessed as part of a complete laminate system rather than selected on dielectric properties alone.
Aramid reinforcement, including Kevlar, is valued for its low weight and toughness. These characteristics can be useful when a protective cover must withstand mechanical loads or handling without adding unnecessary mass.
Our guide to Kevlar fabric covers its mechanical characteristics. For RF use, the finished aramid-resin laminate also needs suitable dielectric properties.
The resin matters just as much as the fabric. It binds the reinforcement together, helps determine environmental resistance, and contributes to the laminate's electromagnetic response.
Start with the antenna, not the material catalog. Its operating frequency, acceptable transmission loss, and position behind the cover determine what the radome must allow through.
From there, radome material selection becomes a balance of electrical and mechanical requirements. Dielectric properties matter, but so do wall thickness, curvature, mounting features, vibration, moisture exposure, and the temperatures the component may encounter.
A useful example comes from research published in Composites Part A: Applied Science and Manufacturing. The researchers tested S-glass and aramid hybrid laminates with different stacking arrangements. One configuration achieved more than 91% microwave transmissivity under the study's test conditions, showing how fiber arrangement can influence electromagnetic performance alongside mechanical strength.
That result belongs to the specific materials and configurations examined in the research. It is not a general performance rating for fiberglass, aramid, or an AMC component.
The front of an aircraft or UAV presents a particular design challenge. Its nosecone needs to fit the surrounding structure, maintain the specified external shape, and protect the equipment behind it. If an antenna transmits or receives through that area, the cover must also meet RF requirements. At AMC Composites, we manufacture RF-transparent nosecones to meet project-specific geometry and performance requirements.
Our Mold Making & Machining capabilities support the production of prototype and production tooling. Accurate mold surfaces and properly planned interfaces are important when a nosecone must fit an existing airframe or other equipment.
Not every RF-transparent nosecone is necessarily a radar radome. The distinction depends on the equipment it covers and the signals that must pass through it. Those details should be established during the component specification.
A telemetry device needs a clear enough radio path to transmit or receive data. If it sits behind a protective composite panel, that panel becomes part of the communication system's design.
AMC also manufactures panels for telemetry devices. A telemetry panel may appear relatively simple compared with a curved nosecone, but it still has several jobs to do. It must fit the equipment housing, accommodate the required mounting features, and withstand the expected service conditions. Its material and thickness must also be compatible with the intended signal.
A nearby carbon fiber structure adds another consideration. Depending on its position relative to the antenna, conductive reinforcement can influence the radio path even when the panel itself uses a suitable dielectric material. That is why antenna clearance, surrounding materials, and mounting details need to be reviewed together.
Where the component forms part of a larger system, our Composite Assembly services can support mechanical integration, fit checks, and the incorporation of required mounting features.
Manufacturing an RF-transparent component begins with understanding which requirements apply to the part itself and which come from the equipment behind it. The mechanical drawing may define its shape and mounting points, while the RF specification establishes what the material needs to transmit.
Design & Development services help address these requirements before production tooling is finalized. The chosen reinforcement and resin must be compatible with both the part geometry and the selected manufacturing route.
AMC offers several Composite Manufacturing processes, including prepreg, vacuum infusion, and wet layup. The appropriate method depends on the specified material system, geometry, and production requirements. A particular RF-transparent process or resin system should be confirmed for each project rather than assumed from the general manufacturing capabilities.
After molding, Composite Trimming can establish final edges, mounting holes, and cutouts. These operations matter when a nosecone or panel must align with antenna housings or adjacent structural components.
Surface treatment also needs to account for RF performance. Surface Preparation (Sanding) can prepare a component for Composite Finishing, but any coating or paint must be evaluated for its effect on signal transmission.
A finished RF-transparent component needs more than a clean surface. The first checks concern manufacturing quality: dimensions, laminate condition, wall thickness, trim quality, and fit with adjoining parts.
Visual inspection can identify exposed defects such as cracking or surface irregularities. Dimensional measurement verifies whether the component matches its drawing. Depending on the requirements, additional non-destructive inspection may be appropriate for identifying internal defects.
Composite Inspection services support dimensional, visual, and other specified quality checks, with certain specialized services completed by outside vendors.
RF verification is a separate matter. Transmission loss, reflection, and related performance may need to be measured over the system's operating frequency range using a suitable test setup. Those requirements should be established with the customer or qualified testing provider before the component is accepted for its intended application.
Before ordering an RF-transparent nosecone, telemetry panel, or other protective composite cover, it helps to define the requirements that will guide material selection and production.
RF-transparent composite materials have to do two jobs at once: protect equipment and allow the required signals to pass through. Choosing the right reinforcement, resin, geometry, and manufacturing approach is therefore more involved than selecting a conventional structural laminate.
At AMC Composites, we manufacture RF-transparent nosecones and panels for telemetry devices, supported by our composite design and manufacturing capabilities. Connect with us to discuss your RF component, material requirements, and production goals.
.webp)
