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Laird Technologies Publishes EMI Microwave Absorber Application Note
Topic Examines Microwave Absorbers for Collision Avoidance System Applications
The application note examines how with the rise of wireless electronics and the movement to higher frequencies, microwave absorbers or "noise suppression sheets" (NSS) are now used to reduce electromagnetic interference (EMI) inside collision avoidance system (CAS) applications. CAS systems detect slower vehicles and adjust the cruise control so the manual changing of the cruise control and/or braking are all done automatically.
Electronics operating at high frequencies can have problems with emissions of high frequency noise. Once placed inside an enclosure, the energy increases in phases at certain frequencies to cause resonances which will hinder the performance of the device. This is especially true in CAS applications, which employ sensors that have absorbers in the back of them in order to function properly.
Two Laird Technologies magnetic absorber product lines that are utilized in CAS systems are reviewed. Q-Zorb(TM) HP (high permeability) achieves extremely high permeabilities at low frequencies, providing EMI reduction at frequencies below 2 GHz. Q-Zorb(TM) HF (high frequency) is ideal for cavity resonance problems from 2 to18 GHz and higher.
The application note then discusses the advantages a magnetic absorber provides over that of a lossy foam-type absorber. Although a foam absorber is a more cost-effective solution, foam absorbers can breakdown over time, causing resistive particles to drop onto the circuit traces. They also do not perform well in H-field (magnetic) dominated current applications, unlike magnetic absorbers which have high H-field loss and attenuate these currents.
With the miniaturization of electronics systems, Q-Zorb(TM) microwave absorbers can solve electromagnetic interference (EMI) problems without additional shielding. They can resolve a wide variety of issues in advanced technologies such as automotive radar, which is utilized in automotive CASs. As the costs of these units decrease and safety becomes mandated, the use of these units will become more widespread. As a leading EMI solutions provider, Laird Technologies offers a wide range of microwave absorber products including die-cut elastomers, foam, thermoplastics and custom solutions to aid in a variety of problems such as internal cavity resonances, antenna pattern shaping and high frequency interference.
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