| 单词 | horn antenna |
| 释义 | > as lemmashorn antenna horn antenna n. (see 15b). horn antenna b. Radio. Any hollow waveguide that increases in one or both transverse dimensions towards the open end and can consequently act as a transmitting or receiving aerial. Also attributive, as horn aerial, horn antenna. ΘΚΠ society > communication > telecommunication > radio communications > radio equipment > [noun] > aerial radiator1897 aerial wire1899 aerial1902 antenna1902 loop antenna1906 loop aerial1913 twin aerial1913 frame aerial1916 loop1922 beam aerial1926 cage aerial1926 Adcock1928 dipole1929 V antenna1932 beam antenna1935 rig1935 horn1936 whip1940 whip aerial1941 whip antenna1943 polyrod1945 unipole1945 slot aerial1946 slot antenna1946 dish1948 quad1951 V aerial1961 dish aerial1962 rectenna1964 omni-antenna1966 monopole1974 1936 W. L. Barrow in Proc. IRE 24 1328 [The pipe can be flared into a horn-shaped radiator]. 1936 W. L. Barrow in Proc. IRE 24 1328 The application of horn radiators is not confined to the hollow tube system, for they may be fed by a coaxial or other lines... Thus, electromagnetic horns may be used as radiators in the wave band below ten meters. 1939 Proc. IRE 27 51 The operation of the electromagnetic horn ‘antenna’. 1949 H. E. Penrose Princ. & Pract. Radar xxii. 511 In general, the longer the opening of the horn, the more directive is the resulting field pattern. 1961 H. Jasik Antenna Engin. Handbk. x. 7 The pyramidal horn is frequently used as a standard horn of known gain in making measurements of other antennas. 1961 G. R. Miczaika & W. M. Sinton Tools of Astronomer viii. 261 Often a parabola is fed by a wave guide that terminates in a horn aimed at the disk. 1962 Observer 10 June 20/1 A huge 340-ton horn antenna at Andover, Maine, will beam signals at the satellite. 1970 Sci. Jrnl. Jan. 18/1 To maintain permanent radio illumination of the Earth the horn aerial mounted at one axis is mechanically despun in the opposite direction to spin stabilization. 1972 Daily Tel. 28 June 11/8 Mounted inconspicuously in its front grille were two four-inch-square radar ‘horns’—one for transmitting, the other for receiving. < as lemmas |
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