The KB Series 0.042″ thick RF absorber material is an iron-loaded silicone elastomer optimized for the K band (18.0 to 27.0 GHz). Designed for superior cavity resonance reduction at mmWave frequencies, the KB Series targets 5G FR2 applications, Ka-band satellite communications, point-to-point backhaul links, and automotive radar systems.

The KB Series is available in a single standard thickness of 0.042″, which is the optimized formulation and thickness combination for peak absorption across the 18.0 to 27.0 GHz range. This covers the 5G n258 band (24.25 to 27.50 GHz) and the lower portion of the n257 band (26.50 to 29.50 GHz). For lower frequencies, see the KU Series (12.0 to 18.0 GHz). For higher frequencies, see the KA Series (27.0 to 40.0 GHz). For applications requiring a non-silicone alternative, consider the US Series acrylic elastomer.

Key Specifications
Base material: Iron-loaded silicone
Thickness: 0.042″ (1.067 mm)
Frequency range: 18.0 to 27.0 GHz (K Band)
Operating temperature: -55 to 200°C
Density: 2.930 g/cm³
Adhesive: PSA backing available (3M 9485PC)
Compliance: RoHS/REACH compliant, halogen-free

Common Applications
Cavity resonance suppression in compact mmWave enclosures, near-field noise suppression, surface current reduction, and EMC compliance in 5G FR2 base stations and small cells, Ka-band satellite transponders, point-to-point microwave backhaul, automotive radar modules, and precision mmWave test equipment.

Need a custom die-cut shape, a thickness not listed here, or a large production quantity? Contact our engineering team for a quote. Custom die-cut parts with PSA backing ship in 2 to 3 weeks.

For complex permeability and permittivity data for electromagnetic simulation (HFSS, CST, COMSOL), email us or give us a call at 855-785-5660.