Circularly-polarized-wave patch antenna which can be used in a wide frequency band
First Claim
Patent Images
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, positioned below the ground electrode opposite the dielectric substrate, that generates 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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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.
186 Citations
10 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, positioned below the ground electrode opposite the dielectric substrate, that generates 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, 5, 6)
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7. 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, positioned below the ground electrode opposite the dielectric substrate, 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, wherein the Wilkinson distribution circuit comprises a junction;
two parallel-connected line conductors connected to the junction, each line conductor having an electric length of about λ
/4 and a characteristic impedance substantially equal to √
{square root over (2×
Z1×
Z2)}, wherein Z1 is an input impedance of the Wilkinson distribution circuit, Z2 is an input impedance of the main body, and λ
is a wavelength of the high-frequency signal on a transmission line; and
a resistor whose both ends are connected between the 90°
-phase-difference generating circuit and the line conductors, the resistance of the resistor being substantially equal to 2×
Z2. - View Dependent Claims (8, 9)
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10. 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, positioned below the ground electrode opposite the dielectric substrate, 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, wherein the 90°
-phase-difference generating circuit and the Wilkinson distribution circuit are provided on a lower surface of a circuit board, which is fixed to a lower surface of the ground electrode of the main body in a laminating manner, upper ends of two feeding pins which extend through the dielectric substrate and the circuit board are connected to the feeding points, and lower ends of the two feeding pins are connected to the output terminals of the 90°
-phase-difference generating circuit.
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Specification
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Current AssigneeALPS Electric Company Limited (Alps Alpine Co., Ltd.)
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Original AssigneeALPS Electric Company Limited (Alps Alpine Co., Ltd.)
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InventorsYuanzhu, Dou
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Primary Examiner(s)Ho, Tan
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Application NumberUS10/615,113Publication NumberTime in Patent Office819 DaysField of Search343/700.MS, 343/846, 343/853, 342/372, 342/375US Class Current343/700.0MSCPC Class CodesH01Q 9/0435 using two feed points
