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Overview
The anechoic chamber or shielded enclosure is lined with absorbing material, which can absorb
electromagnetic waves and reduce or eliminate the reflection and scattering of radio waves. The
performance of the anechoic chamber is closely related to the absorbing performance, frequency
band characteristics, shape, thickness and type of the absorbing material. The more electromagnetic
waves absorbed by absorber, the smaller the reflection, so that the surrounding environment is
getting closer to free space, and the performance of the anechoic chamber is better.
Absorbing materials include polyurethane foam, polystyrene, rubber and other materials. Select the
size, shape and material of the RF absorber according to the size and application of the anechoic
chamber or shielded enclosure. It is also necessary to consider the absorbing performance, frequency
band, price and weight of the RF absorber.
High Performance Microwave Pyramidal Absorber
HR-HPM Absorber is a series of high performance broadband RF absorbers mad efrom specially treated
low density polyurethane foam. The product is flexible and tolerant of physical abuse. Using a steep
pyramid design which provides an impedance gradient, HR-HPM Absorber provides premium performance
in anechoic chambers at both normal and off-normal incidence angles. These products mee t of the
flame-retardant requirements of UL-94-HBF horizontal burning foamed material test, ROHS compliant is
according to IEC 62321 and meet Halogen-Free test of EN14582.
Key Features
Typical weights, dimensions, and reflectivity Of the various grades of HR-HPM Absorber are given in
the tables on the below.
Typically, HR-HPM Absorbers can handle up to 1.0 W/in2 (2 kW/m2) of RF energy in a temperature
controlled room, but this is dependent upon frequency and application.
The product is black thro ughout, and generally is sprayed with a light blue surface coating, both for
cleanliness and to provide better light reflection inside a chamber.
The absorber can be left unpainted if requested.
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AVAILABILITY
Standard sizes of HR-HPM are listed in Table 1, ranging from a 1 inch to 72 inch height.
In addition to simply supplying a bill of materials, HANRUIN designs and installs complete
anechoic chambers. Chambers can be designed to meet your specifications, and an entire
kit of materials is supplied, including factory pre-cuts of special fitting parts. We can install
all materials or supply technical support to help you complete your own installation.
HYSICAL CHARACTERISTICS AND TYPICAL REFLECTIVITY AT NORMAL INCIDENCE
Notes : standard pyramid. The base is the standard 24”(605 mm) base.
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