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- W3021906215 abstract "An antenna is a transducer between electromagnetic waves that are radiated through space and the electromagnetic waves that are contained by a transmission line. It is a two-port transducer where one port represents space, but it sometimes involves several waveguide or coaxial line ports. The transfer function of the antenna might contain an efficiency factor because of energy dissipated in the antenna, and would contain the factors governing the spatial distribution of intensity radiated or received by the antenna. Because of the vector character of the field, the spatial portion of the transfer function is multipole in nature. An isotropic antenna is impossible. There would be a function describing the spatial distribution of field strength produced by the antenna. This is called the antenna pattern and is represented by one or more cross sections in the principal planes. The antenna pattern in a specified plane is a plot of the field strength amplitude versus a space coordinate, which is usually an angle. Sometimes, field intensity rather than field strength is plotted. Linear antennas, like linear networks, obey the reciprocity law. Although large antennas are sometimes used with a fixed pattern in space, the more interesting and difficult cases allow the pattern or beam to move in space." @default.
- W3021906215 created "2020-05-13" @default.
- W3021906215 creator A5087772157 @default.
- W3021906215 date "1964-01-01" @default.
- W3021906215 modified "2023-10-14" @default.
- W3021906215 title "Aperture Theory" @default.
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- W3021906215 doi "https://doi.org/10.1016/b978-0-12-323901-3.50008-5" @default.
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