Cuming Microwave manufactures a full line of low loss dielectric materials. Our materials range in dielectric constant from 1.03 to 30. These materials have unique dielectric and physical properties. Dielectric materials can be used to adjust the Q of cavities, as impedance transitions, substrates for stripline antennas, in transmission lines, smart skins, as dielectric radomes, dielectric spacers, or for circuit substrates.
Low Loss Dielectric Materials
Products are available in rod or sheet form, pack-in-place syntactic foam, rigid foam sheet stock, or as a two-component foaming system. In addition to standard configurations, we can custom fabricate components and work with our customers to find creative solutions to tough problems.
A dielectric material is a material that doesn’t conduct electricity well, but polarizes well. This lets it interact with electrical fields without the fields collapsing into electrical current.
When these materials are placed in an electrical field, the atoms in the material become polarized. They are used in applications like capacitors and radio frequency transmission lines. In the latter case, the dielectric material channels the signal down the wire without letting it leak out, preventing interference. Inside a capacitor, a dielectric material is placed between two conductors. The properties of the dielectric material allow a strong electrical field to build up on the conductors without discharging. However, if a strong enough charge to the system comes along, it overcomes the dielectric material and passes a much greater amount of electricity than normal. A simple example of a dielectric material is dry air. We’ve all felt static electricity in the air, but air itself doesn’t allow for easy conduction of electricity. However, if the field is strong enough the electricity will arc and create lightning.
Dielectric materials are measured on two main variables, dielectric loss and their dielectric constant. All of the materials on this page have low dielectric loss. This means that they don’t lose a lot of energy due to heat as the field moves through them. This is important in applications where components are built compactly. The dielectric constant is a measure of how well the material concentrates electrical fields. The larger the constant, the more charge it can store. Thus, a capacitor made of a high dielectric constant material can store more energy in a smaller space.
Product
Product
Filters
Filters
Name | Category | Product Code | Safety Data Sheet | Product Data Sheet |
|---|---|---|---|---|
| Very Low Loss Polystyrene Sheet and Rod Stock | Low Loss Dielectric Materials | C-STOCK: .0005 | ||
| Plastic Stock With Adjusted Dielectric Constant | Low Loss Dielectric Materials | C-STOCK: AK | ||
| Flexible, low loss, adusted dielectric constant material | Low Loss Dielectric Materials | C-STOCK: AK-S | ||
| Flexible, Weatherproof Low-Signature Plastic Fabric | Accessories | C-STOCK: HCN | ||
| Flexible, Weatherproof Low-Signature Plastic Fabric | Low Loss Dielectric Materials | C-STOCK: HCN | ||
| Low Dielectric Constant, Low Loss Sheet Stock | Low Loss Dielectric Materials | C-STOCK: LOWK | ||
| Flexible, Low Loss Foam | Low Loss Dielectric Materials | C-STOCK: PF | ||
| Low Loss Dielectric Materials | C-STOCK: PK | |||
| Low Dielectric Constant, Low Loss Structural Foam | Low Loss Dielectric Materials | C-STOCK: RH |
Name
Very Low Loss Polystyrene Sheet and Rod Stock
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: .0005
Safety Data Sheet
Product Data Sheet
Name
Plastic Stock With Adjusted Dielectric Constant
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: AK
Safety Data Sheet
Product Data Sheet
Name
Flexible, low loss, adusted dielectric constant material
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: AK-S
Safety Data Sheet
Product Data Sheet
Name
Flexible, Weatherproof Low-Signature Plastic Fabric
Category
Accessories
Product Code
C-STOCK: HCN
Safety Data Sheet
Product Data Sheet
Name
Flexible, Weatherproof Low-Signature Plastic Fabric
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: HCN
Safety Data Sheet
Product Data Sheet
Name
Low Dielectric Constant, Low Loss Sheet Stock
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: LOWK
Safety Data Sheet
Product Data Sheet
Name
Flexible, Low Loss Foam
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: PF
Safety Data Sheet
Product Data Sheet
Name
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: PK
Safety Data Sheet
Product Data Sheet
Name
Low Dielectric Constant, Low Loss Structural Foam
Category
Low Loss Dielectric Materials
Product Code
C-STOCK: RH
Safety Data Sheet
Product Data Sheet
Product Details
Plastic Stock with Adjusted Dielectric Constant - CSTOCK AK and AK-500 (210-1)
C-STOCK AK is a series of plastic stock materials with an adjusted dielectric constant and low loss tangent, intended for a variety of RF and microwave applications. The available dielectric constants range from 3 to 25.
C-STOCK AK is a ceramic filled cross-linked plastic and, unlike sintered ceramics, is readily machined with carbide tools. It has many applications as a dielectric spacer or circuit substrate, tapered permittivity transition, radome, RF lens, or other uses where a machined part of a specific dielectric constant is needed.
C-STOCK AK-500 is a similar product, having essentially the same electrical and mechanical properties as C-STOCK AK, except that it is made from a high temperature plastic which allows continuous use to 200°C (390°F), and short term exposure to 260°C (500°F).
Low Dielectric Constant, Low Loss Sheet Stock - C-STOCK LowK (210-2)
C-STOCK LOW K is a series of sheet stock materials with dielectric constants less than 2.0. These materials also exhibit low loss tangents and have densities well below conventional dielectrics.C-STOCK LOW K is a rigid, low density, very fine-textured syntactic foam with excellent physical properties, and can be easily machined. Suggested uses include antenna, waveguide and coaxial support applications. High-Q RF coils using these materials display improved performance.
C-STOCK LOW K is available in sheets 12in x 12in. in a variety of thicknesses ranging from 0.25 to 4.0in. Parts can be readily machined with conventional machine tools. Assemblies can be built up using compatible C-Bond adhesives.
Low Dielectric Constant, Low Loss Sheet Stock - C-STOCK .0005 (210-3)
C-STOCK .0005 is a specialty plastic product with very low loss tangent (dissipation factor), homogeneity of dielectric constant and loss tangent, and excellent temperature stability. The material is a crosslinked polystyrene, which is a thermosetting plastic, thus it does not melt at elevated temperatures.
C-STOCK .0005 is useful in many RF and microwave applications. It has been used extensively for microwave lenses, antenna insulators, and for a multitude of uses as supports and machined parts in waveguide and coaxial transmission lines.
C-Stcok .0005 has good optical clarity and is readily machined using standard practices for rigid plastics machining. It may be bonded in place using most epoxy adhesives, acrylates or flexible urethane adhesives.
Low Dielectric Constant, Low Loss Structural Foam - C-STOCK RH (210-5)
C-STOCK RH is a series of rigid Polymethacrylimide foams which will withstand temperatures to 380ºF. C-STOCK RH has a high compression and shear strength and a very low dielectric constant and low loss factor. It is easily machined to close tolerances.
C-STOCK RH is useful as a low density, high temperature structural member, as a thermal barrier material, and as an RF window material. C-STOCK RH may be thermo-formed at temperatures of 325ºF to 360ºF, and therefore finds significant uses as radome core material.
C-FOAM PF-2 and PF-4 - Flexible Low Loss Foam (210-6)
PF-2 and PF-4 are closed-cell low loss flexible foam sheets. These materials have low dielectric constant and low loss tangents, making them ideal for use as dielectric substrates and as weather-proof RF transparent radomes.As a closed-cell foam, water absorption rates are low. The material is weather resistant, and will not crack or degrade in sunlight.
Flexible, Weatherproof Low-Signature Plastic Fabric - C-STOCK HCN (210-7)
C-STOCK HCN is a thin, flexible, waterproof and UV-resistant plastic sheet stock with excellent electrical and mechanical properties.
The material is made from nylon fabric sealed with a Polychloroprene-like elastomeric binder. It is often used to cover radar absorber and dielectric materials to impart weatherproof qualities. The resulting surface is neat in appearance and is easy to keep clean.
Rigid Foam-in-Place Liquid Polyurethane - C-FOAM PK (210-8)
C-FOAM PK is a two-part liquid resin kit, which is mixed together to expand into a rigid polyurethane plastic foam with good structural and electrical properties. There are two grades: PK-2, which expands to approximately 2.5-3 PCF (.04-.05 g/cm3 ), and PK-5, which expands to approximately 5-6 PCF (.08-.10 g/cm3). C-FOAM PK is intended for filling cavities of electronic and microwave devices such as waveguides, instrument housings, and radomes.>C-FOAM PK is a polyol-blown urethane with minimal health and flammability hazards. The material can be shipped via regular transportation means without any hazard warnings, however gloves and normal safety procedures should be followed as with any chemical. The liquid material is sensitive to moisture and should be shipped and stored in sealed containers purged with nitrogen.