EMC and Circuit Protection
Can conductive plastics provide effective EMI shielding in 5G applications?
By David Inman, applications and test services manager, Parker Chomerics T
here are many hurdles to overcome if 5G is to deliver the elevated performance and improved efficiency that will empower new user
experiences and connect new industries. Among the keys to achieving this highly desirable outcome is the development of unique EMI shielding materials and techniques that deliver successful control of electromagnetic interference (EMI) and, subsequently, enhance electromagnetic compatibility (EMC).
To provide effective EMI shielding for 5G applications that sufficiently prevents disruption and interference with electronic devices and individual components, there is a need for breakthroughs in material science. The development by Parker Chomerics of its Premier line of conductive plastic material grades for specific use in real-world 5G EMI shielding solutions therefore offers pioneering potential. Each specific conductive plastic grade is a synthesis of PC/ABS thermoplastic
polymer alloys and conductive fillers engineered for balanced electrical, mechanical and physical performance. The conductive filler technology takes advantage of nickel-plated carbon (Ni-C) fibres as the base filler, blended with nickel-graphite (Ni-C) powder to provide elevated performance levels. Each filler material delivers unique properties that help electronic device/equipment OEMs meet EMC demands in the global 5G market.
Fig. 1. The Parker Chomerics Premier line is a blend of PC/ ABS thermoplastic polymer alloys and conductive fillers
66 September 2023 Components in Electronics
Evaluate to accumulate Of course, ensuring the suitability of any new EMI shielding materials for the requirements of 5G applications demands comprehensive testing, so Parker Chomerics set about evaluating a number of Premier
UL-94 V-0 and Super Temperature (ST) grades, namely: A230-FRHF, A230-ST, A240-FRHF and A240-ST.
In the past, the entire Premier family of products has seen extensive testing for EMI shielding characteristics, specifically by deploying industry standards ASTM-D4935 and IEEE-STD-299 across frequency bands extending from 30 MHz to 40 GHz. However, there is an increasing need for materials capable of EMI shielding at the higher frequencies in which 5G will operate. These tests would therefore break new ground. New tests often demand new test methods and equipment, prompting Parker Chomerics to develop a unique, high-frequency shielding effectiveness test enclosure, known as the ‘Mini Box’.
www.cieonline.co.uk.uk
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