Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1997-09-16
2000-03-07
Wong, Don
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343700MS, 343834, 342 70, 342175, G01S 728
Patent
active
060346418
ABSTRACT:
An antenna device comprises an array antenna having a plurality of transmitting planar antenna elements and a plurality of receiving planar antenna elements, a transmission selecting circuit for selecting at least one of the transmitting planar antenna elements, a transmitting circuit for transmitting a signal to the selected at least one transmitting planar antenna element, a reception selecting circuit for selecting at least one of the receiving planar antenna elements, and a receiving circuit for receiving a signal from the selected at least one receiving antenna element. By selecting the planar antenna elements exclusively for transmission or reception, it becomes possible to radiate or absorb (receive) a main beam in or from a direction corresponding to the respective planar antenna element, thereby enabling more minute switching of the main beam directions and improving the directional resolution of the antenna device. Further, by providing the transmitting and receiving planar antenna elements separately, it becomes possible to prevent the deterioration of the reception sensitivity due to the leakage of part of a received signal into a transmission system of the antenna device. An antenna system employing the antenna device is also disclosed.
REFERENCES:
patent: 5717399 (1998-02-01), Urabe et al.
patent: 5724042 (1998-03-01), Komatsu et al.
Ashihara Jun
Kudoh Hiroshi
Clinger James
Honda Giken Kogyo Kabushiki Kaisha
Wong Don
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