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RF Microwave absorbers
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RF Absorbers - RF Absorber Sheet - RF Microwave Absorber -Pyramidal Foam Absorber


Leading Manufacturer & Supplier of RF Absorbers, Pyramidal type absorbers, Wedge type absorbers, Convoluted absorbers, Multilayer broadband absorbers and Walk-on absorbers

    It can be difficult to control radiation in high frequency circuits or systems. For that reason, RF microwave absorber material is often added to the circuit to suppress or eliminate unwanted radiation from the circuit to the outside of the circuit, or to reduce ... It can be difficult to control radiation in high-frequency circuits or systems. For that reason, RF absorbers / RF absorber sheet materials are often added to the circuit to suppress or eliminate unwanted radiation from the circuit to the outside of the circuit, or the effects of radiation signals outside a circuit (such as broadcast signals) on the performance of the circuit. To reduce. To better appreciate RF absorbers and implement them properly, Emerson and Cumming Microwave Products offer a 19-page application note "Theory and Applications of RF / Microwave Absorbers" for free download on their website Have been. This application notes how absorbers step through the basic principle of suppressing radiation, with a brief review on dielectric materials and how they are characterized as related dielectric constant and dielectric loss tangents. This then enhances the discussion of how absorbent materials are characterized by parameters such as magnetic loss tangents, and the permeability and permeability of an absorbing material will vary dramatically with frequency. This then naturally separates the narrower absorbing materials and which are more broadband in nature, including employing an impedance gradient. For the evaluation of the characteristics of absorbent materials, the application note also includes a sidebar story on the NRL arc, originally designed by the Naval Research Laboratory (NRL) and for nondestructive testing of microwave absorber materials over a wide frequency range Has been accepted as an industry standard method. An NRL arc has a transmit and receive antenna, both of which are oriented towards a metal plate. To measure the incident reflectance of a material, the antennas are physically located as close to each other as possible. Typically, a microwave vector network analyzer (VNA) is used to collect test results on a material within the NRL arc. A calibration is performed by measuring the resulting power reflecting the metal plate over a wide frequency range, which is considered the 0-dB level. Then the material under test is placed on the plate and the reflecting signal measured in db. Time-domain gating can be used on the VNA to eliminate antenna-cross talk and reduce the error introduced by room reflections. The size of the absorber material under test and the antenna-to-plate distance are determined by the frequency range of the test. This informative application note reviews a variety of absorbing materials, additional forms of measurement techniques, and a wide variety of applications for RF microwave absorbers. This is generously supported by equations interpreted by the absorbing theory, in which electromagnetic (EM) waves are reflected and transmitted over a physical boundary.

  • Radio Frequency Absorbers shaped with dimensions set specific to wavelengths of interest.
  • Also referred as Radar Absorbent Material / Microwave Absorbers.
  • Its shape & design differs as per client requirement of absorption level.
  • Size of the absorber determines its lowest frequency operation.
  • RF Absorber sheet are tested as per NRL 8093 – test 1, 2 & 3.
  • Ferrite Tiles

      Ferrite tile rf absorbers are useful over the frequency range 30MHz to 1GHz, however the performance deteriorates quickly above 1GHz. Ferrite tiles can be supplied individually (measuring 100mm square and 6.7mm thick) or glued to MDF panels 600mm square.

      Ferrite Tiles are often overlaid with smaller Pyramidal Foam absorber to extend the anechoic performance down to 30MHz without losing valuable space.

    Pyramidal Foam Absorber

      Pyramidal Foam absorber can be utilised for the frequency range 100MHz to 40GHz. The factor determining the lowest useable frequency is the physical size of the foam pyramid. The larger the dimensions of the pyramid, the lower the frequency of operation. Due to the volume consumed within an anechoic enclosure when using large pyramidal foam.

    Features:-
    • Meet up client customize requirement of Quiet Zone for testing.
    • Microwave Absorbers are tested as per IEEE Standards.
    • Reflection coefficients better than -40 dB.
    • Fireproofed urethane foam loaded with carbon.
    • RoHS complied & Long product life.
    • Capable to withstand power of 775 Watt per square meter.
    Applications:-
    • RF Absorbers are lined inside Chamber for measurement of Radiation Pattern, Gain & Different parameters of Antennas.
    • Radio noise Emission Measurements.
    Types of Absorbers:
    • PU Foam base absorbers - 80MHz - 40GHz
    • Ferrite tiles absorbers - 30MHz-1GHz
    • Hybrid Absorbers - 30MHz to 40GHz
    • Ecosorb Absorber Sheets - 100 MHz to 18 GHz
    TYPES OF PU FOAM BASED ABSORBERS:-
    Pyramidal Absorbers:-
    • Tapered to point along with square base of uniform thickness.
    • Height of these Absorbers type varies from 4” to 36” and has standard base size of 60 cm x 60 cm.
    • Excellent Absorption under entire frequency range of 80 MHz to 40 GHz.
    Wedge Absorbers:-
    • Used to direct energy in given path.
    • Polarization Sensitive & Maximum performance at grazing incidence angles.
    • Height of these Absorbers type varies from 4” to 28” and has standard base size of 60 cm x 60 cm.
    Convoluted Absorbers:-
    • Desirable for applications requiring high reflectivity performance with low forward scattering characteristics.
    • Attenuation is high -25 dB to -45 dB from frequency band 2 GHz to 18 GHz as compared to rest type of absorbers.
    • It is manufactured only in standard height of 4” with base size of 60 cm x 60 cm.
    Multilayer Broadband Absorbers:-
    • High Attenuation from frequency range of 100 MHz to 18 GHz.
    • Front surface of these Multilayer Absorbers reduces coupling effect and found application in interference suppression applications.
    • Thickness of these Absorbers type varies from 2cm to 10 cm and has standard base size of 60 cm x 60 cm.
    • Customized availability as per client’s requirement.
    Flat Sheet Absorbers:-
    • High Attenuation from frequency range of 100 MHz to 18 GHz.
    • Thickness of these Absorbers type varies from 1cm to 5 cm and has standard base size of 60 cm x 60 cm.
    • Customized availability as per client’s requirement.
    Weather Proof Absorbers:-
    • Flat Coir sheet absorbers are light weight used in open environment interference suppression applications.
    • Thickness of these Absorbers type varies from 1cm to 10 cm and has standard base size of 60 cm x 60 cm.
    • Customized availability as per client’s requirement.
    Walk on Absorbers:-
    • Rigid block comprising of pyramidal Absorber covered all over with Low density Polystyrene Foam.
    • Utilized to have walking provision inside chamber & each walk-on Absorber bear weight of single person.
    • Customized availability as per client’s requirement.
    Ferrite Tile Absorbers:-
    • These are thin ceramic ferrite tiles with exceptional RF absorbing characteristics in the frequency range of 30 MHz to 1 GHz.
    • Ferrites used to line anechoic chambers for radiated emissions (ANSI C63.4) and immunity (IEC 1000-4-3) testing. Used when high Absorption & Compact Size are required.
    • Ferrites are inherently immune to fire, humidity & Chemicals providing reliable & compact solution for attenuating the plane wave reflections.
    • These tiles can be combined with specially designed urethane foam pyramidal absorbers to extend chamber operation to above 20 GHz.
    Hybrid Absorbers:-
    • Hybrid RF absorber designed for low-frequency EMI test rooms and anechoic chambers.
    • The “hybrid” construction consists of specially-formulated urethane foam pyramidal or wedge absorber panels mounted on top of ferrite tiles.
    • Resulting in almost all the performance normally seen with ferrite tiles alone in the 30 – 1000 MHz range, plus up to -30dB reflectivity from 1 – 20GHz.
    Ecosorb Absorber Sheets:-
    • Thin broadband absorber with a dielectric material.
    • Accepted in microwave and antenna fields.
    • Fabricated using layers of carbon impregnated natural rubber.
    • Will withstand temperatures from -40 to 120 degree C.
    • Impervious to moisture and can be subjected to outdoor environments.
    • Can be easily cut with a knife or die.
    • Effective at high power levels.
    Properties:-
    • Frequency Range: - 100 MHz to 18 GHz
    • Average reflectivity: -20 dB
    • Withstand temperatures: -40 to 120 degree C.
    • Power Handling: - 0.15 W/cm
    • Base Dimensions: - 12” x 18”
    • Weight: - 2.145 Kg (approx.)
    • Density: - 80-85 g/cm
    • Color: - Black
    Applications:-
    • Applied to surfaces to improve radar performance, reduce backscattering.
    • Effective in reducing specular reflections as well as surface currents due to high magnetic loss properties.
    • Used to modify antenna patterns, cover antenna feed supports, line antenna caps to reduce reflections.