TABLE OF CONTENTS Electromagnetic compatibility is likely to play an increasingly important role in both electronic engineering and commercial law during the 1990s [1], The overuse of the EM spectrum, the rapid inclusion of microprocessors into a very wide range of industrial, commercial and domestic equipment, and the increased awareness of possible effects of EM energy on biological systems will bring this about. Electromagnetic compatibility has emerged from the world of military and space systems manufacture, to contribute to the performance of everyday electronic equipment and the profitability of companies engaged in its supply.
There are two kinds of electromagnetic compatibility which a system or equipment designer must consider: intrasystem compatibility, which is concerned with EMI internal to an equipment, and intersystem compatibility, which is concerned with EMI external to the equipment. This involves compatibility with other equipments or systems in its immediate electromagnetic environment and the safeguarding of the wider EM spectrum.
Internal electromagnetic compatibility is important for the equipment to function properly in its own right. Without careful EMC design, circuits can interfere with each other and this leads to unreliable and degraded operation, unnecessary expensive field support engineering and possibly a loss of customer confidence in the product. Electronic designers have a great number of problems to consider and sometimes only recognise EMC when it becomes a problem, usually close to the end of the design stage when it is far too late to effect low-cost solutions. In the past, electronic designers...
