| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Antenna effective area | Business | The functionally equivalent area from which an antenna directed toward the source of the received signal gathers or absorbs the energy of an incident electromagnetic wave. Note 1: Antenna effective area is usually expressed in square meters. Note 2: In the case of parabolic and horn-parabolic antennas, the antenna effective area is about 0.35 to 0.55 of the geometric area of the antenna aperture. (references) | |
| Effective area | Aerospace | 1: 1. In antenna design, the ratio of the received power available at the terminals of an antenna to the power per unit area in the incident wave. For all antennas, effective area A is related to gain G at a given wavelength by the equation: A / G = 2 / 4 Also called effective aperture. See aperture. The effective area of an ideal antenna is equal to its physical area S. In practice, A/S for microwave antennas is always less than one, a representative value for paraboloids being 0.6.2. Same as scattering cross section. (references) | |
| 2: Actual area acted on that results in a force in any device: for example, the area of a bellows joint at the main diameter of the convolutions; internal pressure exerted over this area creates axial or end thrust (pressure separating force) tending to elongate the bellows. (references) | |||
| Effective area of aerial photograph | Forestry | That central part of the photograph delimited by the bisectors of overlaps with adjacent photographs. On a vertical photograph, all images within the effective area have less displacement than their corresponding images on adjacent photographs (Source: Slama, C.C., editor. 1980. Manual of photogrammetry, 4th ed. American Society for Photogrammetry and Remote Sensing, Falls Church, Va.). (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
Topics by Level of Interest: EFFECTIVE AREA | ||||
| Topics sorted by level of Interest | Level (1=low, 600=high) | Topics sorted Alphabetically | Level (1=low, 600=high) | |
| Antenna effective area | 6 | Antenna effective area | 6 | |
Source: the editor, created by/for EVE to gauge likely levels of human interest in linguistically triggered topics (compiled across various sources, such as Wikipedia and specialty expression glosses). | ||||
