Principles in transmission line magnetic field reduction

The basic principles of transmission line magnetic field generation are addressed in order to enhance understanding when designing for low fields. For structured analysis, the B-field RMS-value is represented as a product of autonomous factors. The range of applicability spans phase-split arrangements, active shielding by impressed shield currents, and passive shielding using induced currents with and without series compensation of the shield-conductor loop. An innovative four-conductor scheme is presented.