Foam & Honeycomb Absorbers
This range of absorbers is designed for suppression of interference and side-lobes, isolation of adjacent antennae, camouflaging, lining walls, surfaces and chambers to reduce reflectivity.
Lightweight and flexible, broadband foam absorbers are highly effective at absorbing RF and microwave energy. Single-layer LS foam can be tailored for low or high insertion loss. Multilayer foam absorbers offer at least -17dB reflection loss from 500MHz to 40GHz, depending upon thickness. Reticulated foam can be frequency specific. Dielectric foam absorbers are available as sheets or cut pieces, with optional PSA for easy attachment.
EMC test chambers
Frequently Asked Questions
At what frequencies do absorbers function?
We supply absorbers from ARC Technologies, which attenuate as low as 100MHz and up to 100GHz, depending on the product.
What type of absorber would you recommend for broadband reflection loss?
ARC Technologies ML series of multi-layer foam absorbers are the preferred choice for broadband reflection loss. Depending on the part selected, at least -17dB of loss can be expected from 650MHz to 40GHz. Thicknesses range from 6.4mm to 114.3mm.
Does an absorber need to be attached to metal in order to function properly?
In most cases, yes - attaching the absorber to an electrically reflective metal surface provides a low impedance plane to which the signal will travel as it passes through the absorber. The metal surface need not be grounded. If there is not a metal surface available, HITEK can install a thin foil or metallised film at the back of the absorber.
What is reflection loss?
Reflection loss (expressed in decibels, dB) is the ratio of reflected power to incident power. In simple terms, it means the reduction of a signal after it has attenuated through an absorber and reflected back via a reflective surface behind the absorber.
What is insertion loss?
Insertion loss, also known as transmission loss, is the reduction in power of a signal as measured after it has passed through an absorber having no reflective surface behind it.
Can absorbers be used outdoors?
Microwave and RF absorbers must be protected from the environment. We are able to wrap foam absorbers with CoverLite; a tough, flexible weather resistant covering for applications where the absorber is directly exposed to the elements.