The far zone is also known as which of the following terms?

The far zone is also known as which of the following terms?

• A. Far field
• B. Near field
• C. Focal zone
• D. Fraunhofer zone

Answer: (A)

In this region, the radiated field has settled into a stable angular pattern and the waves behave like plane waves as they propagate outward. The reactive energy near the source has largely diminished, the E and H fields are transverse to the direction of travel, and the field strength falls off roughly as 1/r. This combination of a distance-independent pattern and plane-wave-like behavior defines the far zone. That’s why the term used for this region is the far field. Some texts also use Fraunhofer zone to describe the same region, but the conventional label here is far field. The near field and Fresnel (transition) zone describe areas close to the antenna where reactive energy and transitional patterns dominate, not the established far-field behavior. Focal zone isn’t the standard term for this radiating region.

In this region, the radiated field has settled into a stable angular pattern and the waves behave like plane waves as they propagate outward. The reactive energy near the source has largely diminished, the E and H fields are transverse to the direction of travel, and the field strength falls off roughly as 1/r. This combination of a distance-independent pattern and plane-wave-like behavior defines the far zone. That’s why the term used for this region is the far field. Some texts also use Fraunhofer zone to describe the same region, but the conventional label here is far field. The near field and Fresnel (transition) zone describe areas close to the antenna where reactive energy and transitional patterns dominate, not the established far-field behavior. Focal zone isn’t the standard term for this radiating region.