Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2005-10-04
2005-10-04
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C342S372000
Reexamination Certificate
active
06952183
ABSTRACT:
A circularly-polarized-wave patch antenna includes a main body having a patch electrode provided with two feeding points and a circuit for generating a phase difference of 90° between signals supplied to the feeding points. A Wilkinson distribution circuit is provided between the 90°-phase-difference generating circuit and a coaxial cable (feeder line) so as to improve a reflection characteristic. The patch antenna includes two feeding points, and thus a favorable axial ratio characteristic can be obtained in a wide band. Also, a favorable reflection characteristic can be obtained in a wide band because of the Wilkinson distribution circuit. Accordingly, the patch antenna can be used in a wider frequency band.
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Search Report dated Aug. 4, 2003 for European Patent Application No. EP 03 25 3862.
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Ho Tan
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