They often lack services, including effective public transportation and recreational areas, like parks.
他们往往缺乏服务， 包括有效的公共交通和公园等休闲场所。
| 单词 | Effective area |
| 释义 |
Effective area
原声例句
VOA Special 2015年4月合集 They often lack services, including effective public transportation and recreational areas, like parks. 他们往往缺乏服务， 包括有效的公共交通和公园等休闲场所。
英语百科
Antenna apertureIn electromagnetics and antenna theory, antenna aperture or effective area is a measure of how effective an antenna is at receiving the power of radio waves. The aperture is defined as the area, oriented perpendicular to the direction of an incoming radio wave, which would intercept the same amount of power from that wave as is produced by the antenna receiving it. At any point, a beam of radio waves has an irradiance or power flux density (PFD) which is the amount of radio power passing through a unit area of one square meter. If an antenna delivers an output power of Po watts to the load connected to its output terminals when irradiated by a uniform field of power density PFD watts per square metre, the antenna's aperture Aeff in square metres is given by: |
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