Communications: radio wave antennas – Antennas – Wave guide type
Patent
1997-09-26
1998-12-01
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Wave guide type
343781CA, 343840, H01Q 1919
Patent
active
058445277
ABSTRACT:
Radio waves from the point f2 of the horn 7 are reflected in the diagonal direction at the sub reflector 3 for transmitting and receiving the radio waves and then further reflected at the main reflector 5 so that a fan-shaped beam narrow in the lateral direction is designed to direct in the horizontal direction, and the main reflector 5, the sub reflector 3, and the horn 7 are built into an antenna proper which is designed to be rotatable around the vertial axis 8 passing the point f2 with the rotating means 23, 24, 25 so that the structure is simplified and manufacturing costs are reduced. In order to simplify the structure of the power feeder for the antenna proper, the radar antenna comprises three sections; namely, the antenna proper 1, the cover 30, and the container 28, the container 30 rotatably supporting the antenna 1 and having a waveguide 26 to be connected to the rotating means 24, 25 for rotating the antenna proper 1 and the horn 7, the container 28 being designed to house a circuit board 36, to which a transmitting pulse oscillator 31 and a frequency converter 33 to be connected to the waveguide 26 are mounted and a modulation circuit 37 of the transmitting pulse oscillator 31 and an intermediate frequency conversion circuit 38 of the frequency converter 33 are provided.
REFERENCES:
patent: 2549721 (1951-04-01), Straus et al.
patent: 3029431 (1962-04-01), Miller
patent: 3562753 (1971-02-01), Tanaka et al.
patent: 3911441 (1975-10-01), Stein
patent: 4866457 (1989-09-01), Hogg
Ozaki Tadashi
Takashima Tetsuya
Yano Koji
Furuno Electric Company Limited
Wimer Michael C.
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