Communications: radio wave antennas – Antennas – Microstrip
Patent
1996-03-29
1998-01-27
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Microstrip
H01Q 138
Patent
active
057126445
ABSTRACT:
An microstrip antenna for use in a vehicle collision system is described wherein an array of rectangular patch elements are arranged in rows and columns on a substrate. A feed structure is used whereby a high gain highly efficient flat plate antenna is produced. The feed structure includes a pair of main lines to which feed points are connected. A plurality of branch lines connect at right angles to the main lines and extend alongside columns of patch elements. The patch elements are so spaced that they are electrically separated by a whole multiple of the dielectric wavelength. The main lines are connected to the branch lines by coupling traces whose widths are selected to establish a desired power distribution. A plurality of strip transformers are distributed along the main lines and connected to junctions with the branch lines to reduce reflections.
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