| 释义 |
ˌomnidiˈrectional, a.
Also omni-directional.
[f. omni- + directional a.]
Of equal sensitivity or power in all directions (usu., all horizontal directions).
1927Daily Tel. 22 Mar. 13 The Marconi Company quoted {pstlg}66,153 for the Beam system and {pstlg}29,163 for a system of omni-directional communication. 1932Times Educ. Suppl. 31 Dec. p. i/2 The other short-wave transmitter worked on 15,140 kc/s, using an omni-directional aerial. 1947Buck & Pierce in J. S. Hall Radar Aids to Navigation ii. 51 The uhf omnidirectional beacons..are based primarily on the low-frequency system used for marine navigation. 1952E. A. Laport Radio Antenna Engin. ii. 94 Experience has been gained with vertical radiators at many hundreds of broadcast stations, each employing one or more for omnidirectional or directive radiation. 1959H. Hobson Mission House Murder xxi. 140 They..fixed an omni-directional, remotely controlled microphone which transmitted on a closed circuit. 1969R. B. Fuller Operating Man. Spaceship Earth vi. 88 Einstein formulated his famous equation E = M (matter's mass, explained in the terms of C2—speed of an omni⁓directional (radiant) surface wave's expansion, unfettered, in a vacuum). 1976CB Mag. June 7/1 (Advt.), Electrical design of the long, 64 wavelength vertical radiating element plus full size radials guarantee..highest signal radiation efficiency in the desired vertical plane and omnidirectional, full coverage transmitting and receiving pattern.
Hence ˌomnidirectioˈnality, the property of being omnidirectional; ˌomnidiˈrectionally adv., in all directions.
1950Jrnl. R. Aeronaut. Soc. LIV. 279/2 By comparing the phase of the rotating radiation pattern with that of a reference signal radiated omni-directionally, the bearing of the aircraft from the beacon is determined. 1966L. V. Blake Antennas vii. 330 In unstabilized-spacecraft applications three-dimensional omnidirectionality may be desired. 1972Science 20 Oct. 273/1 In order to achieve omnidirectionality, a second array is envisaged, located at right angles to the first. 1976Wireless World Mar. 44/3 Real antennas do not radiate omnidirectionally, but concentrate the power into a directional beam. |