Microwave absorbers for ADAS applications
The Chomerics Division of Parker Hannifin has developed an elastomer-based microwave absorber materials to protect advanced driver assistance systems (ADAS) from electromagnetic interference (EMI).
The CHO-MUTE 9005 and 9025 materials have been developed to absorb EMI radiation and ensure data integrity in automotive ADAS safety systems.
ADAS must work effectively 100% of the time, as any failure in blind spot detection or adaptive cruise control could have tragic results. Process-essential ADAS components, such as lane detection warning systems and back-up cameras, have become a critical element of the present-day driving experience. However, while this technology fulfils a pivotal function in avoiding accidents or lessening the severity of those that are impossible to avert, it also introduces several engineering challenges.
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Advanced sensor and radar assemblies deployed in the latest automobiles experience severe and relentless EMI from surrounding electronics, as well as EMI radiation from the device itself. These effects can lead to data inaccuracies and compromise safety and reliability.
EMI shielding materials are a crucial component of ensuring ADAS systems function properly every time, without fail. The adopted materials must offer high performance characteristics and design flexibility, as requirements during development are frequently ambiguous and expansive; engineers should always anticipate a manufacturing modification. While there are various options for EMI protection, absorbers are ideal for the higher frequencies found typically in automotive devices.
The CHO-MUTE 9005 and 9025 materials use a silicone elastomer matrix with ferrous filler material to provide RF absorption performance over a broadband frequency range from 500 MHz to 18 GHz. The absorbers are intended to be used on top of EMI-radiating components or in cavities that house components causing EMI disturbances, minimizing cavity-to-cavity cross coupling and microwave cavity resonances.
The materials are available in sheet stock of various thicknesses with or without pressure-sensitive adhesive. Customers can easily die-cut the CHO-MUTE 9005 and 9025 for the empirical testing of absorption solutions or assembly into cavities. Both materials have been tested and certified to the UL 94 V-0 flammability standard.
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