US 6,982,673 B2
Inverted-F metal plate antenna having increased bandwidth
Dou Yuanzhu, Fukushima-ken (Japan)
Assigned to Alps Electric Co., Ltd., Tokyo (Japan)
Filed on Mar. 26, 2004, as Appl. No. 10/810,021.
Claims priority of application No. 2003-100438 (JP), filed on Apr. 03, 2003.
Prior Publication US 2004/0196195 A1, Oct. 07, 2004
Int. Cl. H01Q 1/38 (2006.01)
U.S. Cl. 343—700MS 1 Claim
OG exemplary drawing
 
1. An inverted F-metal plate antenna fixed on a ground conductor surface, comprising:
a radiating conductor plate disposed opposing and substantially in parallel with the ground conductor surface;
a power-feeding conductor plate that is bent to extend substantially perpendicularly from an outer edge of the radiating conductor plate and connected to power-feeding circuit; and
at least a first and a second shorted conductor plates that are bent to extend substantially perpendicularly from a plurality of points on outer edges of the radiating conductor plate and connected to the ground conductor surface, the first and second shorted conductor plates having different distances to the power-feeding conductor plate;
wherein a broadband-frequency signal including a frequency component that resonates at a position of the first shorted conductor and a frequency component that resonates at a position of the second shorted conductor is fed to the power-feeding conductor plate.