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- W3023581266 abstract "Publisher SummaryThe antenna acts as a transducer between the transmission line or waveguide, and free space as it match the line or guide impedance to the impedance of free space. Antenna measurements, and specifications are usually measured relative to an isotropic radiator—that is, a spherical point source that radiates equally well in all directions. Two fields are important on an antenna: near field and far field. The antenna feedpoint impedance includes radiation resistance, ohmic losses, and reactive losses. Directivity is the ability of the antenna to focus energy in a limited direction. Three principal feed methods are used for parabolic dish antennas: focal point feed, Cassegrain feed, and monopulse feed. Array antennas use a number of radiator elements at critical spacing to sum up their respective fields and thus provide gain. The elements of a slot array antenna are slotted waveguide sections; each slot acts as a resonant radiator. Solid-state array antennas use either active or passive phase shifting elements. Additional antennas used at microwave frequencies are helical, polycone, and ring or disk Yagi." @default.
- W3023581266 created "2020-05-13" @default.
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- W3023581266 date "1996-01-01" @default.
- W3023581266 modified "2023-09-27" @default.
- W3023581266 title "Microwave Antennas" @default.
- W3023581266 doi "https://doi.org/10.1016/b978-075069707-1/50053-5" @default.
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