| 单词 | radio beam |
| 释义 | > as lemmasradio beam a. Radio Communication. In full radio beam, wireless beam: radio waves transmitted as a beam, i.e. undispersed, from a special aerial system, part of which acts as a reflector; usually attributive. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > radio wave > types of space wave1899 surface wave1913 CW1920 beam1924 sky wave1924 ground wave1927 tweek1933 1899 G. Marconi in Jrnl. Inst. Electr. Engineers 28 274 Should it be necessary to direct a beam of rays in one given direction I prefer to use an arrangement similar to a Righi oscillator placed in the focal line of a suitable cylindrical parabolic reflector.] 1924 Marconi 2 July in Jrnl. Royal Soc. Arts 25 July 607/2 The transmission and reception of intelligible signals over a distance of 1¾ miles of a beam system employing short waves and reflectors. 1924 Westm. Gaz. 24 July Arrangements had been made for the erection of a beam station in Canada. 1924 Daily News 14 Nov. 7/4 Beam wireless. 1925 Telegr. & Teleph. Jrnl. Mar. 107/1 Australian papers give the following..information regarding the ‘Beam’ Radio Stations. 1927 Daily Mail 2 Dec. 11/1 Cable Companies and The Beam. 1928 Morning Post 23 Mar. 14 Beam-cable fusion [of the Eastern Exchange Cable Company and Marconi Company]... The beam system of telegraphy. 1934 Nature 24 Feb. 297/2 One advantage of short-wave transmission in radio communication is that it is possible to concentrate the radiation..in one direction, thus forming a beam of waves... A series of vertical aerials..(called a beam array) will act like Hertz's reflector. 1946 Proc. IRE 34 335 (title) A Current Distribution for Broadside Arrays which Optimizes the Relationship between Beam Width and Side-Lobe Level. 1958 Engineering 31 Jan. 157/3 The aerial has been designed to give a sharp beamwidth at high signal strength. At 20 db the horizontal beamwidth extends about 0·65 deg. radio beam radio beam n. ΚΠ 1922 Lowell (Mass.) Sun 5 July 3/1 Even in the heaviest fogs, steel vessels many miles away may be located and their course determined by the radio beams reflected from them. 1994 C. Pursell White Heat vi. 153 The microwaves of radar were joined by the radio beams from proximity fuses. < as lemmas |
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