Communications: radio wave antennas – Antennas – Wave guide type
Patent
1997-08-25
1999-03-16
Wong, Don
Communications: radio wave antennas
Antennas
Wave guide type
343772, 333238, H01Q 1300
Patent
active
058836039
ABSTRACT:
A method for adjusting the radiation direction of an antenna, which uses a plurality of uniformly spaced diffraction gratings formed in the waveguide of the antenna while adjusting the maximum radiation direction of radiation waves emerging from the diffraction gratings and varying the length of crystal lattices in the diffraction gratings, thereby achieving an improvement in the directivity of the radiation waves and an adjustment in the radiation direction of radiation waves. In accordance with this method, it is possible to vary the radiation direction of an electronic wave passing through the antenna by varying the interval of crystal lattices in a region where the diffraction gratings exist. Accordingly, it is possible to obtain a narrow beam width characteristic. The diffraction gratings are made of a piezo-electric material. Using the characteristic of such a piezo-electric material, it is possible to vary the interval of crystal lattices in the diffraction grating region in an electrical manner, thereby adjusting the radiation direction of beams.
REFERENCES:
patent: 4689584 (1987-08-01), Sequeira
patent: 4835543 (1989-05-01), Sequeira
patent: 5237334 (1993-08-01), Waters
patent: 5652596 (1997-07-01), Abrahams et al.
Ho Tan
Hyundai Electronics Industries Co,. Ltd.
Wong Don
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