US 6,982,674 B2 | ||
Antenna apparatus | ||
Hiroyuki Matsubara, Tokyo (Japan); and Shinobu Izumi, Saitama (Japan) | ||
Assigned to Sony Corporation, Tokyo (Japan) | ||
Filed on Apr. 01, 2004, as Appl. No. 10/816,136. | ||
Claims priority of application No. 2003-101165 (JP), filed on Apr. 04, 2003. | ||
Prior Publication US 2004/0252060 A1, Dec. 16, 2004 | ||
Int. Cl. H01Q 1/38 (2006.01) |
U.S. Cl. 343—700MS | 7 Claims |
1. An antenna apparatus comprising:
a first circularly polarized antenna that efficiently sends and/or receives high-frequency signals in a first frequency band,
the antenna having a substantially hemispherical radiation pattern;
a second circularly polarized antenna that efficiently sends and/or receives high-frequency signals in a second frequency
band higher than the first frequency band, the antenna having a substantially hemispherical radiation pattern; and
a single substrate, the first circularly polarized antenna and the second circularly polarized antenna being disposed on the
front and rear surfaces, respectively, of the substrate, the radiation patterns of these two antennas thereby being opposite
in direction.
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