Circularly-polarized-wave patch antenna which can be used in a wide frequency band
First Claim
1. A patch antenna comprising:
- a main body including a dielectric substrate in which a patch electrode is provided on one principal surface thereof and a ground electrode is provided on the other principal surface thereof, two feeding points being provided in the patch electrode;
a circuit for generating a phase difference of 90°
between high-frequency signals supplied to the two feeding points through a pair of output terminals connected to the two feeding points; and
a Wilkinson distribution circuit including a pair of output terminals connected to the 90°
-phase-difference generating circuit, wherein an input terminal of the Wilkinson distribution circuit is connected to a feeder line so that the main body radiates a circularly polarized radio wave.
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Accused Products
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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Citations
4 Claims
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1. A patch antenna comprising:
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a main body including a dielectric substrate in which a patch electrode is provided on one principal surface thereof and a ground electrode is provided on the other principal surface thereof, two feeding points being provided in the patch electrode;
a circuit for generating a phase difference of 90°
between high-frequency signals supplied to the two feeding points through a pair of output terminals connected to the two feeding points; and
a Wilkinson distribution circuit including a pair of output terminals connected to the 90°
-phase-difference generating circuit,wherein an input terminal of the Wilkinson distribution circuit is connected to a feeder line so that the main body radiates a circularly polarized radio wave. - View Dependent Claims (2, 3, 4)
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Specification