nahfeldartige

Nahfeldartig is a German term that translates to "near-field-like" or "near-field type." It is primarily used in the context of physics and engineering, particularly in wave phenomena and antenna theory. The term describes a situation or characteristic that resembles the behavior observed in the near-field region of a radiating source.

The near-field of a source, such as an antenna, is the region closest to it where the electromagnetic field is complex and strongly dependent on the specific geometry and electrical size of the source. In this region, the electric and magnetic field components are not necessarily in phase, and the wave impedance can vary significantly.

When something is described as "nahfeldartig," it implies that it exhibits some of these near-field characteristics, even if it is not strictly within the defined near-field boundary of a particular source. For instance, a measurement taken at a distance from a device might be considered "nahfeldartig" if the field distribution at that point is still dominated by reactive power and shows spatial variations not typical of the far-field, where the wave behaves more like a plane wave and its characteristics are primarily dependent on the direction of propagation.

This concept is important for understanding signal propagation, electromagnetic compatibility, and the design of antennas and other radiating systems. It helps to distinguish between phenomena governed by the immediate source characteristics and those governed by the propagating wave's far-field behavior.