Patent Number: 7,786,943

Title: Antenna device and radio communication system

Abstract: An antenna device includes: a substrate; first and a second antenna units which are wound coaxially on a surface of the substrate, and include a plurality of antenna elements; and a feeder which feeds power only to the first antenna unit. A separation distance between the antenna elements in each of the first and second antenna units is substantially the same.

Inventors: Deguchi; Futoshi (Fukuoka, JP)

Assignee: Panasonic Corporation

International Classification: H01Q 11/12 (20060101); H01Q 19/10 (20060101); H01Q 1/36 (20060101)

Expiration Date: 8/31/12018