| 摘要 |
PROBLEM TO BE SOLVED: To provide an in-vehicle GPS antenna 10 which is installed on an inclined face such as a windshield of a vehicle, and is superior in gain in a zenith direction. SOLUTION: A first loop antenna element 14 receives a GPS clockwise circularly polarized wave signal with an effective length of one wavelength of the GPS clockwise circularly polarized wave signal, and includes a first feed electrode 16 and a ground electrode 18. A second loop antenna element 22 surrounds the outside of the first loop antenna element 14, includes a second feed electrode 24, and shares the ground electrode 18. A pole antenna element 26 has one end connected to an intermediate point p at a distance of the same effective length from the second feed electrode 24 and the ground electrode 18 on the second loop antenna element 22, and has an effective length of a quarter wavelength of the GPS clockwise circularly polarized wave signal. They are disposed on one plane, and are installed on an inclined face of the vehicle so that the side where the first feed electrode 16 and the ground electrode 18 are provided, of the first loop antenna element 14 is located on the upper side. COPYRIGHT: (C)2011,JPO&INPIT
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